Describe how a shovel makes moving dirt easier. Use the words "resistant force," "effort force," and "distance." Tell what kind of simple machine a shovel is.

A simple machine is a device for doing work that has only one part. Simple machines redirect or change the size of forces, allowing people to do work with less muscle effort and greater speed, thus making their work easier. There are six kinds of simple machines: the lever, the pulley, the wheel and axle, the inclined plane, the wedge, and the screw.