A simple machine helps make work easier. It can also make it easier to move objects. They use energy to work and have few orno moving parts.

The five most simple machines are the wheel, the pulley, the inclined plane, the lever and the wedge .

A lever is a simple machine comprised of a fulcrum and a bar. The fulcrum creates a pivot point which allows motion of the bar. The closer the fulcrum is to the object you want to move, the less force there must be applied to the opposite end of the bar to move the object.

There are three classes of levers. The position of the fulcrum, bar and force determine the class of the lever. Some examples of levers are wrenches, wheelbarrows, and see saws.