Lever
simple machine consisting of a beam or rigid rod pivoted at a fixed hinge, or fulcrum / From Wikipedia, the free encyclopedia
A lever is a simple machine. It is something that can be used in a lot of ways. One way is by measuring things, or by seeing which weighs more. A lever is supported by a fulcrum which it uses to lifts weights. It is one of six simple machines. There are three types of levers: first-class, second-class and third-class.
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/a/a9/LeverFirstClass.png/240px-LeverFirstClass.png)