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

A simple machine helps make work easier. It can also make it easier to move objects. They use energy to work and have few or no moving parts.

The wheel was invented a long time ago. Because it is round it can roll. using a wheel alone or in combination with other wheels can enable an object to travel from one spot to another. As the wheel rolls it grasps the path in front of it creating friction. This friction in turn helps to push the wheel ahead.