Force and Laws of Motion

Introduction

• Science and Fan's method of study presentation
• Beginning of One Shot Lecture (Force and Laws of Motion)
• Motion chapter was taught first, now Force and Laws of Motion will be covered in one shot
• Making study more fun with activities and videos
• Discussions about the experiences of online and offline students
• The characteristics of the Tree Batch

CBSE Syllabus 2023-24

• Included force, Newton's three laws, and conservation of momentum
• Conservation of momentum has been removed
• Following NCERT

What is Force?

• Force: Push and Pull
• Effect of Force: Change in the motion of an object

Types of Forces

• Contact Forces: Contact required
• Non-Contact Forces: Contact not required
• Balanced Forces: When equal forces act from opposite directions, the total force is zero
• Unbalanced Forces: When forces act from opposite directions, the total force is not zero

What can Force do?

• Can move an object
• Can stop a moving object
• Can change the direction
• Can change the speed
• Can change the shape and size

Newton’s Three Laws

Newton’s First Law

• An object at rest will remain at rest
• An object in motion will remain in motion (in a straight line with uniform speed)
• State will change only when force is applied
• Inertia: The property of an object that does not allow its state to change
• Types of Inertia: Inertia of rest, inertia of motion, inertia of direction

Newton’s Second Law

• The rate of change of momentum is directly proportional to the force applied
• Formula: F = ma
• Momentum: Mass * Velocity
• SI Unit of Momentum: kg m/s
• Momentum measures the impact of a collision
• Case Study: Momentum of a bullet*

Newton’s Third Law

• For every action, there is an equal and opposite reaction
• Examples: Walking, jumping, recoiling of a gun, rocket launch, rowing

Conclusion

• Two main formulas of Force: Momentum (p = mv) and Force (F = ma)
• Chapter is mainly numerical-based
• Question-answer session to follow