Lecture on Motion

[Music] thank you [Music] oh who all loves to travel because I think we all love right and last week I think a lot of us traveled hey hello good evening everyone Namaste and I hope all of you are well and look at this nice view nice train can we go to Australia with Priya is it is it possible hello hey good evening good evening look at the formalities done am I clearly audible people to you come on tell me so neither I must hi there I must come on tell me I'm good I'm good uh how are you yes chatting it rains Australia do you think yes very good all right all right good evening good evening no our kid says no hello good evening as a year leave this okay thank you thank you all right so we cannot go to Australia by a train but how can we go I guess you know the answer because that's one of the answers the initial video is already telling you about don't worry I'll also tell you in between the session how to go to Australia and watch the cricket match live all right so people the reason I have this nice view nice moving train behind me is because we are here to study Motion in one shot that's why you are here that's why we are here this is the mission midterms we are running and yes so today we are talking about Motion in one shot so before moving further let me just tell you what we'll cover the complete chapter types of motion uh circular motion I would say you know acceleration average speed average velocity everything will be covering in this one particular session which means I want you to be attentive I want you to be uh careful listen well and just keep on noting down important points Anna yes hello shivansh no not not late all right so people excited excited for motion in one shot do you think this this is a difficult chapter hello good evening hey so tell me go on do you think this is this is a difficult kind of chapter because I don't think it's difficult very good afternoon is saying no very good easy one so I'll tell you it is not a difficult chapter but it is a pretty important chapter because Basics start from this when you move to class 11th or higher classes no starting dimensions then we go to words we go towards 1D motion 2D motion and all these things about class 11th and that is the basics so today if we cover everything very nicely plainly simply easily you will never never be you know I would say get confusion basics only graph is required by the way today we are covering graph also all right people and uh people who are afraid of graphs no I I have something for you in the end I'll tell you all right hello people let's start Motion in one shot ready excited come on delete it nothing is Charo let's see and now that we are doing everything make sure you press if you are not a subscriber basically make sure you press the Subscribe button and the bell icon right this is very important because then only you'll get to know whatever we are doing a special user whether and I'll tell you all right yes if you are Hindi me nobody will miss anything even you have uh you understand Hindi even if you don't understand English everybody will get everything is just try to be acquainted with English also future me English mohini gravitation one shot will do but first we'll cover the chapter doing just one shot directly will not be helpful for you I understand your midterm gravitation oh yeah okay take care make sure you are a subscriber to the channel because if you are not you are missing a lot of things let's start with a basic railway station some something is happening in all ways right things are moving yes uh only one is fine but it's okay you can get three also all right so railway station is a very I would say very easy example or a place where a lot of things are happening right things are not just stationary find the watch the Train the escalators correct so let's start with trains to uh today will take a lot of trains for our reference together then if I ask you if I ask you can you describe the position of this train what is the position of this train what will you say what will you say rest uh okay see rest people pankaj is saying rest okay uh can you describe the position of the strain there is a difference between position and state of motion so rest or motion is actually a state of motion if I ask you what is your position what you will say stable position okay forward position is saying throat if I just drink water in between oh okay nice nice Shivan is a good answer only with respect of a point all right I understand I understand okay I'll tell you it's not that easy right nice very good Krishna we take a reference point huh so if I tell you okay train there are things which you can take for reference for example if I if I tell you this tree is far if five meters from the tail of the train this uh you know speed limit sign board is four meters from the I would say the head of the train Hannah correct so when you have references then telling becomes easy if you have a reference it becomes easy airport if you go five kilometers towards that particular area correct nice frame of reference very good huh so that's why can you describe positioning or telling where something is becomes easy when you have a reference otherwise or by the way on in our concept sessions we have done a lot of things about this no pole Stars so if you are there correct nice nice very good so what is the reference point if we just try to Define this see we all know what is the reference point it's not like I would say you don't know but the question is can we put it into words when a thing is moving but with respect to what that is also a question so a reference point is a place or an object used as reference to describe the position or motion of an object as such simply a statement what is the reference point it is something you take as reference to define the position or state of motion of any other object nice very good shivansh that's true so we have done this thing uh I don't know if you were there some other class have done this if this is one remote this is another remote Hannah um if both are moving so you have taken this as a reference no white remote is at rest compared to the black remote Cube because the rear reference point is moving that's why reference you can't choose anything but you have to tell the answer of your body move right with respect to the reference that is important all right correct so that is what you call as a reference point fine uh let's say you are in a train and this is something we all have noticed you know when you are on a train a train going forward at least your casual language when you see outside trees go back no hello yes correct and um now I told you you also have to answer with respect to the reference for you inside the train foreign yes it depends on everything on the reference other trees running because you know right that's why what about the objects inside the tree I mean if I am inside the train everything is there why how do you know correct because we are moving right so how do you know because I'll tell you rest versus motion there is very very simple example or one very simple Funda of telling if something is at rest or a motion Valley cheese choose a reference right because with respect to whom are you telling okay that is important yes so that's a question I thought it's a very long statement you were telling me what is the restaurant was motion don't worry I'm telling you about wrestling so rest versus motion first of all what is rest train is interesting happy why is because position of object does not change respect or surroundings how do I know if something is at rest you see an object okay and the Observer let's say I am the reference point I'm looking at this remote so what is happening one second two second three second four second so time is passing but remote position the position of remote is same with respect to the Observer means it is at rest easy henna so Aman your question will be answered with this example I'm taking right now if I am the if I'm the Observer this this remote is in front of me sitting there not changing its position with respect to me it is at rest with respect to me if let's say this is the reference point this black pen and this is moving right this is moving so this is not at rest with respect to the black pen correct why because black panther it was here after two seconds it was here after two seconds it was here right so that's why it is moving correct foreign rest position changes with respect to time motion simple enough uh type of motion will do today let's have just now joined up yes so that's it's a very important statement so cargo is saying something and it is a very important statement motion is always always a relative thing motion is never absolute you cannot say Earth is at rest or Earth is moving until unless you mention who is the Observer that's why motion is always relative boy important statement and and I'm just here giving you another I would say motivation to subscribe because things are changing starting a free workout but then what happened the MLP became paid then for first thousand subscriber then 500 for the first 500 subscribers every week the MLP is free there's a link given to you in the description make sure you click on it make sure you get this 399 pack of three trial sessions for free otherwise take care okay ah very good very good nice yes Welcome to our family and if you haven't subscribed yet make sure you subscribe because there is something extra you are getting if you are a new subscriber I'm just telling you let's say you are a premium student oh nice so even if you if you are a premium so there are two types of premium Now one is uh premium and one is the two teacher model premium and you can be either both of them also the two teacher models this is for the two teacher model people who haven't tried a two-teacher model make sure you try it because Live Well I feel has Kendra and you can schedule your classes at your own time that's why all right so link is there make sure you try it and for first 500 you have free theme pack session so let's talk about distance and distance something which we all relate to oh nice very good so distance what is distance distance is simple we all know distance it is the total length of past covered the total length of path traveled between initial and final position so whenever actually you take a Google map let's say from this point to that point and map tells you Road it is eight kilometers you will take this much time on an average yes it is you can also try don't worry total length covered no so that's why this is initial position this is final position so any length you take that is the distance correct now shortest one p will come don't worry the shortest one is the displacement now sometimes we might think it's a distance we use distance in daily life whatever we travel how much petrol you want in your car you know it depends on distance how far something is based on what route you take displacement where do we use displacement is more and more for technical purposes every formula every calculation you do in physics it's mostly about displacement today you might not understand it properly future me you will realize by displacement bhati important here for calculation and you know deriving purposes that's important right it's important that distance is total length displacement is the shortest length very good now different famous equation I would tell you both are exams or I would say your board exams your midterms they sometimes ask this question very nicely distance displacement means tell two differences between distance displacement of three differences correct yes so first is it is a total length displacement is shortest distance which we all agree on it is described by magnitude sir what is the magnitude what is the magnitude I have told this to you before nice very good very good uh Bridge mohini nice actually very good Aman shivansh value huh nice value number correct very good prachi nice nice this comes very common very common question tendency of inertia to maintain state of motion ah magnitude means number they go if I tell you what is magnitude you know you will tell me a number how far five kilometers ticket that's okay today I traveled I I rode a bicycle for two kilometers this two is what it is the magnitude that is important okay yes it is a numerical value okay and it will be uh displacement if I talk about displacement it is described by both magnitude and direction it's a vector quantity quantities which require only and only a number I don't need anything else that's fine if you ask me that that the white remote is right the white remote is next to the pen next to the pen what will you say sir wide remote is is what right to the pen left to a pen kitna you will say Sir wide remote is 10 centimeter left of the pin right yes displacement Direction in displacement you are trying to tell this object is this much far from me and in this direction you will exactly tell the position if I tell you display distance that's where Anna yes okay distance example here the road travel you do you know that is the distance displacement I would say uh relativistic example airplane you can say but as such it's a very technical word it's shortest distance yoga displacement okay yes will be positive for a body in motion can be positive zero or negative a displacement how can displacement be positive it can be negative it can be zero because of Direction by if you have a reference reference zero sir right if on right it is positive left is negative this is I have chosen but this is helping me out if a body is 5 meter to the right I can say it is plus 5 meter if you tell plus 5 meter it gives me an idea pass meter right if I tell you any other body is 10 meter to the left you will say the displacement is minus 10 meter from the reference it is 10 meter to the left that is why this is for direction plus minus 0 therefore Direction TK nice all right so with this discussion this is something which we all agree upon displacement distance right direction Plus distance is the displacement correct cargo no no gaurav not necessary but this is usually what we take you know this is usually what we take okay plus left both the minus number system all right so this is important thing this will come in front of the blank space it's okay actually all right now a question to you which of the following trains will reach the destination first you can tell me with the color also they go one is blue and one is Gray blue one or gray one it's a very easy question every nose white Zero have white ptk I understand what you are saying there yeah it's okay by the way there is one assumption I'm asking you to make that is destination is equally far for both distance now why did you say gray one Q because you can see it moving faster we all have a sense of if something is moving fast or something is moving slows what do we say that quantity that quantity is called as speed yes so whenever you want to answer how fast or how slow and you want to quantify it by both very fast very slow it's already subjective term can there be a number it's speed right yes oh that's why blue ocean you went very philosophical here correct you know so speed rate of motion of a body challenge speed is distance traveled Upon Time taken okay how fast any particular length has been covered it is distance what is length length is distance speed is what distance Upon Time easy right correct Hannah yes so speed is distance traveled Upon Time taken as a unit meter per second wait distance it is nice ah correct yes that's an average speed average speed total distance traveled upon total time taken sir what is the difference between speed the formula and average speed of formula total distance traveled upon total time how many of you feel that total distance traveled upon total time taken is actually same as this distance traveled Upon Time taken ah when two speeds are there or there's scenario given to you now you know there is a reason I'm spending time on this and I think yes what are the difference average speed U plus V by 2. this is a Formula which a lot of students remember it is that's how sometimes we do it what does it mean s answer this is a lot of you make mistakes in this one particular point not same uh take an example so I'll tell you they go how does the question come a body covers half of the distance with a speed of 20 meter per second and remaining half of the distance it covers with 40 meter per second let's say or a body covers a body travels for 20 meter per second for let's say 2 hours and first about 40 meter per second for let's say two hours again if this happens we should not use U plus V by two and I'll tell you one secret forget this formula you only remember sir total distance traveled upon total time taken yeah total speed total times distance hello yes all right correct so that's why U plus G by 2 never blindly apply it go with Basics total distance traveled upon total time yes speed in a specific Direction now this is again this is speed but in One Direction a body is traveling with two meter per second who will tell velocity will tell right yes Hannah yes so that's why I did in that now I multiplied by 4 is because total times that's why foreign yes all right 20 meter per second for let's take seconds only for 10 seconds 40 meter per second for 20 seconds total distance 20 into 10. if you add both of them it becomes total distance upon total time 10 plus 20 seconds 10 plus 20 and that's how you get the answer simple henna explain velocity is what speed with Direction it is displacement Upon Time taken yes unit will be same sir why displacement is in meters time is in second so unit is meter per second easy right average velocity is displacement Upon Time taken total displacement about 12 times yes yeah very good if velocity is changing at a uniform rate so U plus v upon 2 after like I'm telling you again because I have done in unit test League I have given you questions and I have seen you making mistakes yes but you know what it doesn't always run like this when a station is near the train goes like um foreign very basic difference yes in CGS centimeter per second you're right uh correct Hannah so uniform and non-uniform definition how will you tell definition sir if a train covers equal distances in equal intervals of times here in the next one what is happening oh sir in 0 to 1 hour train covered 20 kilometer that is fine one two two are train covered 20 kilometer again right huh two to three drink about 20 Lakin Lakin did you notice the animation train is not moving constantly huh one hour it took more time so that's why what I'm saying is it depends equal distance equal interval of time uniform unequal distance equal interval of time non uniform yes second is non-uniform so unequal distance is in equal intervals of time it is non-uniforms so that's why take care yes so this one is called as uniform motion this is not information easy what happens how do you make a motion non-uniform right yes hello right ha very good so people I'll take this question kirath is asking is is asking one good question equal distances in not equal interval of time non-uniform motion sir I cover 10 kilometer you know I covered 10 kilometer kilometers right I'm good Rafiq how are you yes correct so this is also fine unequal distance is equal to time equal distance is an unequal interval times if you want to make the motion non-uniform you press the accelerator not U basically foreign equal kilometer foreign so this is what happens when you press the accelerator your speed increases but what is acceleration accelerator this word this name is accelerations what is acceleration is rate of change of velocity how fast the velocity changes distance sir how fast distance changes speed how fast speed change is acceleration ticket that is fine displacement displacement is what a charge so it is that it is the shortest distance how fast displacement changes with time is velocity how fast velocity changes with time is acceleration acceleration is a vector quantity yes all right hello so that's why it is the change in velocity Upon Time taken simple a formula unit meter per second Square Casino so this is meter per second Square that's why meter per second Square one kilometer per hour is equal to what kilometer so punima is saying one kilometer per hour Matlab in one hour body is covering one kilometer yes so does acceleration always mean change in speed this is important question come on huh by the way tell me answer this question come on everyone everyone no okay question here yes does acceleration always mean change in speed ah nice very good I'm no Boulder example if you are telling me no give me the example also nice see most of you who are saying no that's correct if you notice if let's say there is a train which is moving in a circle circle and every time it is covering 2 meter per second speed two meter per second going in a circle uh uh yes correct yeah body is going in a circle sir its speed is constant but direction must be changing yeah uniform circular motion right so that's why what is uniform circular motion motion of an object on a circular path with constant or uniform speed foreign yes I know so all right now direction of velocity very varies notice at this animation now very clearly this yellow ball notice notice you know what its velocity at each instant is tangential velocity is at every moment is tangential so tangential Circle tangent this is what we call this is the circle and this is what we call as tangent by radius okay oh nice all right so it is tangential so acceleration acceleration is towards the center a is centripetal very good acceleration B okay so uniform circular motion is actually an accelerated motion exam a lot of exams will try to confuse you uniform circular motion is an example of uniform non-uniform something something it is an example of accelerated motion only take care yes and velocity directed tangentially at all points similarly around sorry so if you notice Suns and Earth's gravitation together right because of this Earth is not rotating velocity is tangential acceleration is towards the Sun yes trigonometry also plays role correct acceleration means change in velocity Upon Time taken if body is magnitude does not change but Direction change it is still a change in velocity now Matlab velocity change acceleration bus ticket yes so it's not always about magnitude only acceleration it is about magnitude all direction or magnitude and direction of motion very good foreign make sure the BST see if you're if you click on the link there's a link in the description if you click on that it will give you exact timing four five six guys then we have a 12 is there a timing make sure you take this for the chair the winners will get a chance to go to Australia [Music] all right you have registered people who are new who haven't registered make sure you register see all these are very good opportunities you know for everyone yes you have given them very good so make sure you watch our sessions on graphs we have done sessions on equation of motion only a special session make sure you watch them huh yes yeah evidence you can yes Krishna correct change in velocity and a new student make sure you register for the BST and Anthony both so distance time graph sorry y-axis coordinate geometry y-axis is my distance x axis is my time this is normally what we takes sometimes examiner in order to confuse you and I'm telling you in in olympiads or competitive exams so what is it it is the position of object with time can be presented distance time graph time till 4 time is increasing means body is moving distance increasing body was sitting but time was moving Matlab body was sitting at 100 time was moving easily a straight line again time is increasing and the body is moving distance yes oh nice very good so this is about distance time graph if you are okay and if you are fine with the definitions now graph is nothing special same slope of distance time graphics is the new thing slope by slope slope is change in y-axis upon change in x axis what is change in y axis change in y axis is telling me how much distance is covered change in x axis that is time axis is telling me how much time is covered right that's why tan Theta 2 you won't require it right now but now that's true to get a couple of death speed S2 minus S1 upon T2 minus T1 I told you S2 minus S1 this is my total distance covered S2 minus S1 T2 minus T1 final time minus initial time T2 minus T1 a speed okay easy right uh meter into second asses there is no quantity which we Define huh right distance time graph so if it's a straight line we call it uniform motion if it's a curved line it's a non-uniform motion because if you notice in foreign foreign accelerated nice distance it is accelerated and this one is bus you should know about this next displacement time graph sir distance time is one graph displacement time around the graph simple is displacement it is S2 minus S1 upon T2 minus T1 it will be velocity only simple henna correct reflection of light we have done uh sessions for class 9th 99th winning here class 10th we have done but don't worry we'll talk about this oh not opening from here oh okay okay let me just do one thing now in this video's comment section just put up your comment uh I'll see I'll talk to your team thank you turbo feature 0 .10 how do we know something is a positive slope if final value is more than initial values because because how do you find slope sir final value minus initial value Upon Time taken that's why Anna correct so that's why is angle 90 degrees it's a good question but today I won't take it because it will take time it's famous positive it's a positive velocity this is zero rest and this is negative negative velocity negative velocity in vector quantity what does negative positive tell you direction right so distance time graph era versus displacement time graph here the car update now foreign of displacement cap initial and final position shortest distance if the body is coming back eight six four two zero that is why displacement time graph is looking like this and distance is looking like this easy correct Hannah correct yes velocity time graph so VT Graphics are simple if a VT graph you are you are looking for slope slope so velocity Upon Time acceleration V2 minus given upon T2 minus T1 right and area so what is area area meter per second multiplied by second by meter per second into second this is what meters right meters is about displacement so VT graph area displacement slope acceleration simple area under is displacement easy now VT graph if I tell you it's a straight line Matlab slope is constant so slope is acceleration acceleration is constant if it's a curved line I see random curved line Matlab it is not a non uniform motion sir velocity upon time it is acceleration if it's a straight line you know if it's a straight line is changing Matlab it's a non-uniform motion correct oh sorry by the way non-informations it's a non-uniformly accelerated motion I would say acceleration ah all right now people notes or and take a link also I'll give you on the telegram don't worry constant and uniforms don't worry yes very good very good so telegram link is also there in the description make sure you join it and people I I want you to understand that you know we have got you covered yes make sure you are a subscriber if you are not or we are also planning for a doubt session there is a link in the description make sure you click on that and send us your doubt now session we will have to assume what doubt you have and then when will come make sure you send your doubts professional personal conceptual will take it very good now last request make sure you like this video or this session if you think this was good yeah make sure this family grows and subscribe so I told you it's very important right average velocity I think you were not there by the way but average velocity questioning yeah it's total displacement upon total time taken only and don't worry we'll do questions on this questions take care make sure you like share subscribe bye bye thank you take care [Music]

[Music] thank you [Music] oh who all loves to travel because I think we all love right and last week I think a lot of us traveled hey hello good evening everyone Namaste and I hope all of you are well and look at this nice view nice train can we go to Australia with Priya is it is it possible hello hey good evening good evening look at the formalities done am I clearly audible people to you come on tell me so neither I must hi there I must come on tell me I&#39;m good I&#39;m good uh how are you yes chatting it rains Australia do you think yes very good all right all right good evening good evening no our kid says no hello good evening as a year leave this okay thank you thank you all right so we cannot go to Australia by a train but how can we go I guess you know the answer because that&#39;s one of the answers the initial video is already telling you about don&#39;t worry I&#39;ll also tell you in between the session how to go to Australia and watch the cricket match live all right so people the reason I have this nice view nice moving train behind me is because we are here to study Motion in one shot that&#39;s why you are here that&#39;s why we are here this is the mission midterms we are running and yes so today we are talking about Motion in one shot so before moving further let me just tell you what we&#39;ll cover the complete chapter types of motion uh circular motion I would say you know acceleration average speed average velocity everything will be covering in this one particular session which means I want you to be attentive I want you to be uh careful listen well and just keep on noting down important points Anna yes hello shivansh no not not late all right so people excited excited for motion in one shot do you think this this is a difficult chapter hello good evening hey so tell me go on do you think this is this is a difficult kind of chapter because I don&#39;t think it&#39;s difficult very good afternoon is saying no very good easy one so I&#39;ll tell you it is not a difficult chapter but it is a pretty important chapter because Basics start from this when you move to class 11th or higher classes no starting dimensions then we go to words we go towards 1D motion 2D motion and all these things about class 11th and that is the basics so today if we cover everything very nicely plainly simply easily you will never never be you know I would say get confusion basics only graph is required by the way today we are covering graph also all right people and uh people who are afraid of graphs no I I have something for you in the end I&#39;ll tell you all right hello people let&#39;s start Motion in one shot ready excited come on delete it nothing is Charo let&#39;s see and now that we are doing everything make sure you press if you are not a subscriber basically make sure you press the Subscribe button and the bell icon right this is very important because then only you&#39;ll get to know whatever we are doing a special user whether and I&#39;ll tell you all right yes if you are Hindi me nobody will miss anything even you have uh you understand Hindi even if you don&#39;t understand English everybody will get everything is just try to be acquainted with English also future me English mohini gravitation one shot will do but first we&#39;ll cover the chapter doing just one shot directly will not be helpful for you I understand your midterm gravitation oh yeah okay take care make sure you are a subscriber to the channel because if you are not you are missing a lot of things let&#39;s start with a basic railway station some something is happening in all ways right things are moving yes uh only one is fine but it&#39;s okay you can get three also all right so railway station is a very I would say very easy example or a place where a lot of things are happening right things are not just stationary find the watch the Train the escalators correct so let&#39;s start with trains to uh today will take a lot of trains for our reference together then if I ask you if I ask you can you describe the position of this train what is the position of this train what will you say what will you say rest uh okay see rest people pankaj is saying rest okay uh can you describe the position of the strain there is a difference between position and state of motion so rest or motion is actually a state of motion if I ask you what is your position what you will say stable position okay forward position is saying throat if I just drink water in between oh okay nice nice Shivan is a good answer only with respect of a point all right I understand I understand okay I&#39;ll tell you it&#39;s not that easy right nice very good Krishna we take a reference point huh so if I tell you okay train there are things which you can take for reference for example if I if I tell you this tree is far if five meters from the tail of the train this uh you know speed limit sign board is four meters from the I would say the head of the train Hannah correct so when you have references then telling becomes easy if you have a reference it becomes easy airport if you go five kilometers towards that particular area correct nice frame of reference very good huh so that&#39;s why can you describe positioning or telling where something is becomes easy when you have a reference otherwise or by the way on in our concept sessions we have done a lot of things about this no pole Stars so if you are there correct nice nice very good so what is the reference point if we just try to Define this see we all know what is the reference point it&#39;s not like I would say you don&#39;t know but the question is can we put it into words when a thing is moving but with respect to what that is also a question so a reference point is a place or an object used as reference to describe the position or motion of an object as such simply a statement what is the reference point it is something you take as reference to define the position or state of motion of any other object nice very good shivansh that&#39;s true so we have done this thing uh I don&#39;t know if you were there some other class have done this if this is one remote this is another remote Hannah um if both are moving so you have taken this as a reference no white remote is at rest compared to the black remote Cube because the rear reference point is moving that&#39;s why reference you can&#39;t choose anything but you have to tell the answer of your body move right with respect to the reference that is important all right correct so that is what you call as a reference point fine uh let&#39;s say you are in a train and this is something we all have noticed you know when you are on a train a train going forward at least your casual language when you see outside trees go back no hello yes correct and um now I told you you also have to answer with respect to the reference for you inside the train foreign yes it depends on everything on the reference other trees running because you know right that&#39;s why what about the objects inside the tree I mean if I am inside the train everything is there why how do you know correct because we are moving right so how do you know because I&#39;ll tell you rest versus motion there is very very simple example or one very simple Funda of telling if something is at rest or a motion Valley cheese choose a reference right because with respect to whom are you telling okay that is important yes so that&#39;s a question I thought it&#39;s a very long statement you were telling me what is the restaurant was motion don&#39;t worry I&#39;m telling you about wrestling so rest versus motion first of all what is rest train is interesting happy why is because position of object does not change respect or surroundings how do I know if something is at rest you see an object okay and the Observer let&#39;s say I am the reference point I&#39;m looking at this remote so what is happening one second two second three second four second so time is passing but remote position the position of remote is same with respect to the Observer means it is at rest easy henna so Aman your question will be answered with this example I&#39;m taking right now if I am the if I&#39;m the Observer this this remote is in front of me sitting there not changing its position with respect to me it is at rest with respect to me if let&#39;s say this is the reference point this black pen and this is moving right this is moving so this is not at rest with respect to the black pen correct why because black panther it was here after two seconds it was here after two seconds it was here right so that&#39;s why it is moving correct foreign rest position changes with respect to time motion simple enough uh type of motion will do today let&#39;s have just now joined up yes so that&#39;s it&#39;s a very important statement so cargo is saying something and it is a very important statement motion is always always a relative thing motion is never absolute you cannot say Earth is at rest or Earth is moving until unless you mention who is the Observer that&#39;s why motion is always relative boy important statement and and I&#39;m just here giving you another I would say motivation to subscribe because things are changing starting a free workout but then what happened the MLP became paid then for first thousand subscriber then 500 for the first 500 subscribers every week the MLP is free there&#39;s a link given to you in the description make sure you click on it make sure you get this 399 pack of three trial sessions for free otherwise take care okay ah very good very good nice yes Welcome to our family and if you haven&#39;t subscribed yet make sure you subscribe because there is something extra you are getting if you are a new subscriber I&#39;m just telling you let&#39;s say you are a premium student oh nice so even if you if you are a premium so there are two types of premium Now one is uh premium and one is the two teacher model premium and you can be either both of them also the two teacher models this is for the two teacher model people who haven&#39;t tried a two-teacher model make sure you try it because Live Well I feel has Kendra and you can schedule your classes at your own time that&#39;s why all right so link is there make sure you try it and for first 500 you have free theme pack session so let&#39;s talk about distance and distance something which we all relate to oh nice very good so distance what is distance distance is simple we all know distance it is the total length of past covered the total length of path traveled between initial and final position so whenever actually you take a Google map let&#39;s say from this point to that point and map tells you Road it is eight kilometers you will take this much time on an average yes it is you can also try don&#39;t worry total length covered no so that&#39;s why this is initial position this is final position so any length you take that is the distance correct now shortest one p will come don&#39;t worry the shortest one is the displacement now sometimes we might think it&#39;s a distance we use distance in daily life whatever we travel how much petrol you want in your car you know it depends on distance how far something is based on what route you take displacement where do we use displacement is more and more for technical purposes every formula every calculation you do in physics it&#39;s mostly about displacement today you might not understand it properly future me you will realize by displacement bhati important here for calculation and you know deriving purposes that&#39;s important right it&#39;s important that distance is total length displacement is the shortest length very good now different famous equation I would tell you both are exams or I would say your board exams your midterms they sometimes ask this question very nicely distance displacement means tell two differences between distance displacement of three differences correct yes so first is it is a total length displacement is shortest distance which we all agree on it is described by magnitude sir what is the magnitude what is the magnitude I have told this to you before nice very good very good uh Bridge mohini nice actually very good Aman shivansh value huh nice value number correct very good prachi nice nice this comes very common very common question tendency of inertia to maintain state of motion ah magnitude means number they go if I tell you what is magnitude you know you will tell me a number how far five kilometers ticket that&#39;s okay today I traveled I I rode a bicycle for two kilometers this two is what it is the magnitude that is important okay yes it is a numerical value okay and it will be uh displacement if I talk about displacement it is described by both magnitude and direction it&#39;s a vector quantity quantities which require only and only a number I don&#39;t need anything else that&#39;s fine if you ask me that that the white remote is right the white remote is next to the pen next to the pen what will you say sir wide remote is is what right to the pen left to a pen kitna you will say Sir wide remote is 10 centimeter left of the pin right yes displacement Direction in displacement you are trying to tell this object is this much far from me and in this direction you will exactly tell the position if I tell you display distance that&#39;s where Anna yes okay distance example here the road travel you do you know that is the distance displacement I would say uh relativistic example airplane you can say but as such it&#39;s a very technical word it&#39;s shortest distance yoga displacement okay yes will be positive for a body in motion can be positive zero or negative a displacement how can displacement be positive it can be negative it can be zero because of Direction by if you have a reference reference zero sir right if on right it is positive left is negative this is I have chosen but this is helping me out if a body is 5 meter to the right I can say it is plus 5 meter if you tell plus 5 meter it gives me an idea pass meter right if I tell you any other body is 10 meter to the left you will say the displacement is minus 10 meter from the reference it is 10 meter to the left that is why this is for direction plus minus 0 therefore Direction TK nice all right so with this discussion this is something which we all agree upon displacement distance right direction Plus distance is the displacement correct cargo no no gaurav not necessary but this is usually what we take you know this is usually what we take okay plus left both the minus number system all right so this is important thing this will come in front of the blank space it&#39;s okay actually all right now a question to you which of the following trains will reach the destination first you can tell me with the color also they go one is blue and one is Gray blue one or gray one it&#39;s a very easy question every nose white Zero have white ptk I understand what you are saying there yeah it&#39;s okay by the way there is one assumption I&#39;m asking you to make that is destination is equally far for both distance now why did you say gray one Q because you can see it moving faster we all have a sense of if something is moving fast or something is moving slows what do we say that quantity that quantity is called as speed yes so whenever you want to answer how fast or how slow and you want to quantify it by both very fast very slow it&#39;s already subjective term can there be a number it&#39;s speed right yes oh that&#39;s why blue ocean you went very philosophical here correct you know so speed rate of motion of a body challenge speed is distance traveled Upon Time taken okay how fast any particular length has been covered it is distance what is length length is distance speed is what distance Upon Time easy right correct Hannah yes so speed is distance traveled Upon Time taken as a unit meter per second wait distance it is nice ah correct yes that&#39;s an average speed average speed total distance traveled upon total time taken sir what is the difference between speed the formula and average speed of formula total distance traveled upon total time how many of you feel that total distance traveled upon total time taken is actually same as this distance traveled Upon Time taken ah when two speeds are there or there&#39;s scenario given to you now you know there is a reason I&#39;m spending time on this and I think yes what are the difference average speed U plus V by 2. this is a Formula which a lot of students remember it is that&#39;s how sometimes we do it what does it mean s answer this is a lot of you make mistakes in this one particular point not same uh take an example so I&#39;ll tell you they go how does the question come a body covers half of the distance with a speed of 20 meter per second and remaining half of the distance it covers with 40 meter per second let&#39;s say or a body covers a body travels for 20 meter per second for let&#39;s say 2 hours and first about 40 meter per second for let&#39;s say two hours again if this happens we should not use U plus V by two and I&#39;ll tell you one secret forget this formula you only remember sir total distance traveled upon total time taken yeah total speed total times distance hello yes all right correct so that&#39;s why U plus G by 2 never blindly apply it go with Basics total distance traveled upon total time yes speed in a specific Direction now this is again this is speed but in One Direction a body is traveling with two meter per second who will tell velocity will tell right yes Hannah yes so that&#39;s why I did in that now I multiplied by 4 is because total times that&#39;s why foreign yes all right 20 meter per second for let&#39;s take seconds only for 10 seconds 40 meter per second for 20 seconds total distance 20 into 10. if you add both of them it becomes total distance upon total time 10 plus 20 seconds 10 plus 20 and that&#39;s how you get the answer simple henna explain velocity is what speed with Direction it is displacement Upon Time taken yes unit will be same sir why displacement is in meters time is in second so unit is meter per second easy right average velocity is displacement Upon Time taken total displacement about 12 times yes yeah very good if velocity is changing at a uniform rate so U plus v upon 2 after like I&#39;m telling you again because I have done in unit test League I have given you questions and I have seen you making mistakes yes but you know what it doesn&#39;t always run like this when a station is near the train goes like um foreign very basic difference yes in CGS centimeter per second you&#39;re right uh correct Hannah so uniform and non-uniform definition how will you tell definition sir if a train covers equal distances in equal intervals of times here in the next one what is happening oh sir in 0 to 1 hour train covered 20 kilometer that is fine one two two are train covered 20 kilometer again right huh two to three drink about 20 Lakin Lakin did you notice the animation train is not moving constantly huh one hour it took more time so that&#39;s why what I&#39;m saying is it depends equal distance equal interval of time uniform unequal distance equal interval of time non uniform yes second is non-uniform so unequal distance is in equal intervals of time it is non-uniforms so that&#39;s why take care yes so this one is called as uniform motion this is not information easy what happens how do you make a motion non-uniform right yes hello right ha very good so people I&#39;ll take this question kirath is asking is is asking one good question equal distances in not equal interval of time non-uniform motion sir I cover 10 kilometer you know I covered 10 kilometer kilometers right I&#39;m good Rafiq how are you yes correct so this is also fine unequal distance is equal to time equal distance is an unequal interval times if you want to make the motion non-uniform you press the accelerator not U basically foreign equal kilometer foreign so this is what happens when you press the accelerator your speed increases but what is acceleration accelerator this word this name is accelerations what is acceleration is rate of change of velocity how fast the velocity changes distance sir how fast distance changes speed how fast speed change is acceleration ticket that is fine displacement displacement is what a charge so it is that it is the shortest distance how fast displacement changes with time is velocity how fast velocity changes with time is acceleration acceleration is a vector quantity yes all right hello so that&#39;s why it is the change in velocity Upon Time taken simple a formula unit meter per second Square Casino so this is meter per second Square that&#39;s why meter per second Square one kilometer per hour is equal to what kilometer so punima is saying one kilometer per hour Matlab in one hour body is covering one kilometer yes so does acceleration always mean change in speed this is important question come on huh by the way tell me answer this question come on everyone everyone no okay question here yes does acceleration always mean change in speed ah nice very good I&#39;m no Boulder example if you are telling me no give me the example also nice see most of you who are saying no that&#39;s correct if you notice if let&#39;s say there is a train which is moving in a circle circle and every time it is covering 2 meter per second speed two meter per second going in a circle uh uh yes correct yeah body is going in a circle sir its speed is constant but direction must be changing yeah uniform circular motion right so that&#39;s why what is uniform circular motion motion of an object on a circular path with constant or uniform speed foreign yes I know so all right now direction of velocity very varies notice at this animation now very clearly this yellow ball notice notice you know what its velocity at each instant is tangential velocity is at every moment is tangential so tangential Circle tangent this is what we call this is the circle and this is what we call as tangent by radius okay oh nice all right so it is tangential so acceleration acceleration is towards the center a is centripetal very good acceleration B okay so uniform circular motion is actually an accelerated motion exam a lot of exams will try to confuse you uniform circular motion is an example of uniform non-uniform something something it is an example of accelerated motion only take care yes and velocity directed tangentially at all points similarly around sorry so if you notice Suns and Earth&#39;s gravitation together right because of this Earth is not rotating velocity is tangential acceleration is towards the Sun yes trigonometry also plays role correct acceleration means change in velocity Upon Time taken if body is magnitude does not change but Direction change it is still a change in velocity now Matlab velocity change acceleration bus ticket yes so it&#39;s not always about magnitude only acceleration it is about magnitude all direction or magnitude and direction of motion very good foreign make sure the BST see if you&#39;re if you click on the link there&#39;s a link in the description if you click on that it will give you exact timing four five six guys then we have a 12 is there a timing make sure you take this for the chair the winners will get a chance to go to Australia [Music] all right you have registered people who are new who haven&#39;t registered make sure you register see all these are very good opportunities you know for everyone yes you have given them very good so make sure you watch our sessions on graphs we have done sessions on equation of motion only a special session make sure you watch them huh yes yeah evidence you can yes Krishna correct change in velocity and a new student make sure you register for the BST and Anthony both so distance time graph sorry y-axis coordinate geometry y-axis is my distance x axis is my time this is normally what we takes sometimes examiner in order to confuse you and I&#39;m telling you in in olympiads or competitive exams so what is it it is the position of object with time can be presented distance time graph time till 4 time is increasing means body is moving distance increasing body was sitting but time was moving Matlab body was sitting at 100 time was moving easily a straight line again time is increasing and the body is moving distance yes oh nice very good so this is about distance time graph if you are okay and if you are fine with the definitions now graph is nothing special same slope of distance time graphics is the new thing slope by slope slope is change in y-axis upon change in x axis what is change in y axis change in y axis is telling me how much distance is covered change in x axis that is time axis is telling me how much time is covered right that&#39;s why tan Theta 2 you won&#39;t require it right now but now that&#39;s true to get a couple of death speed S2 minus S1 upon T2 minus T1 I told you S2 minus S1 this is my total distance covered S2 minus S1 T2 minus T1 final time minus initial time T2 minus T1 a speed okay easy right uh meter into second asses there is no quantity which we Define huh right distance time graph so if it&#39;s a straight line we call it uniform motion if it&#39;s a curved line it&#39;s a non-uniform motion because if you notice in foreign foreign accelerated nice distance it is accelerated and this one is bus you should know about this next displacement time graph sir distance time is one graph displacement time around the graph simple is displacement it is S2 minus S1 upon T2 minus T1 it will be velocity only simple henna correct reflection of light we have done uh sessions for class 9th 99th winning here class 10th we have done but don&#39;t worry we&#39;ll talk about this oh not opening from here oh okay okay let me just do one thing now in this video&#39;s comment section just put up your comment uh I&#39;ll see I&#39;ll talk to your team thank you turbo feature 0 .10 how do we know something is a positive slope if final value is more than initial values because because how do you find slope sir final value minus initial value Upon Time taken that&#39;s why Anna correct so that&#39;s why is angle 90 degrees it&#39;s a good question but today I won&#39;t take it because it will take time it&#39;s famous positive it&#39;s a positive velocity this is zero rest and this is negative negative velocity negative velocity in vector quantity what does negative positive tell you direction right so distance time graph era versus displacement time graph here the car update now foreign of displacement cap initial and final position shortest distance if the body is coming back eight six four two zero that is why displacement time graph is looking like this and distance is looking like this easy correct Hannah correct yes velocity time graph so VT Graphics are simple if a VT graph you are you are looking for slope slope so velocity Upon Time acceleration V2 minus given upon T2 minus T1 right and area so what is area area meter per second multiplied by second by meter per second into second this is what meters right meters is about displacement so VT graph area displacement slope acceleration simple area under is displacement easy now VT graph if I tell you it&#39;s a straight line Matlab slope is constant so slope is acceleration acceleration is constant if it&#39;s a curved line I see random curved line Matlab it is not a non uniform motion sir velocity upon time it is acceleration if it&#39;s a straight line you know if it&#39;s a straight line is changing Matlab it&#39;s a non-uniform motion correct oh sorry by the way non-informations it&#39;s a non-uniformly accelerated motion I would say acceleration ah all right now people notes or and take a link also I&#39;ll give you on the telegram don&#39;t worry constant and uniforms don&#39;t worry yes very good very good so telegram link is also there in the description make sure you join it and people I I want you to understand that you know we have got you covered yes make sure you are a subscriber if you are not or we are also planning for a doubt session there is a link in the description make sure you click on that and send us your doubt now session we will have to assume what doubt you have and then when will come make sure you send your doubts professional personal conceptual will take it very good now last request make sure you like this video or this session if you think this was good yeah make sure this family grows and subscribe so I told you it&#39;s very important right average velocity I think you were not there by the way but average velocity questioning yeah it&#39;s total displacement upon total time taken only and don&#39;t worry we&#39;ll do questions on this questions take care make sure you like 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Transcript for:Lecture on Motion

Transcript for:
Lecture on Motion