Lever
What is it?
A lever is a simple machine that is made up of a board or bar that rests on an object. The object that holds up the bar is called a fulcrum
Why do we use it?
Levers are used to make moving heavy objects much easier by using less force.
There are 3 parts to a lever.
1. Effort- the force that moves the lever
2. Load- the object the lever is trying to move.
3. Fulcrum- the point on which the lever moves.
First-class Lever
In a first class lever, the fulcrum is located between the effort and the load. 
Second-Class Lever
In a second class lever, the load is between the fulcrum and the effort.
In a second class lever, the load is between the fulcrum and the effort.
Third-class Lever\
In a third-class lever, the effort is between the fulcrum and the load.
In a third-class lever, the effort is between the fulcrum and the load.
lever
http://ed101.bu.edu/StudentDoc/Archives/ED101sp06/cjhpyo/lever.htm
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