what does this code have to do with levers this is a simple mnemonic device that you can use to remember levers and we'll learn more about it at the end of this video welcome to moomoomath and science Alevis a simple machine and they are the basis of many tools in and around your house and work levers are also found in the human body the way a lever works is that a force is applied at a point which moves the load at another point through a balance point called the fulcrum it's the position of these three points to force the load and the fulcrum that distinguishes the type of class of lever there are three classes of levers first second and third where the first class lever the fulcrum is in the middle and the forces on one side and the load is on the opposite end much like this seesaw other examples include scissors here's the force the fulcrum and the load and pliers second class levers have the load between the force and the fulcrum for example with this wheelbarrow here's the force the fulcrum and the load a nutcracker is an example and a stapler a third class lever has the fulcrum on one end the force in the middle and the load on the other end for example with this hockey stick this rake is a third class lever and a hammer here's the fulcrum the force and the load now let's take a look at this easy mnemonic device to help you remember the different class of levers first you write out FLE kind of like you're fleeing from someone chasing you with the lever next underneath right 1 2 3 the letters stand for fulcrum load and effort and tells you what's in the middle the 1 2 3 is the type of class lever so with the first class lever the 1 is under the F so a first class lever has the fulcrum in the middle a second class lever is under the L so second class lever has a load in the middle and the third class lever which lines up with the e has the effort in the middle if you'd like to know more about levers this playlist will help and as always thanks for watching and moomoomath uploads a new math and science video every day please subscribe and share