Simple machines and the relationship between work and force are defined. Inclined planes, the wheel and axle, pulleys, levers, wedges, and screws are detailed. This video consists entirely of typed white print appearing across a purple...

This video segment adapted from NOVA follows two teams as they each test a different engineering design in an effort to explain how ancient Egyptians raised a giant stone obelisk. [5:21]

In this video segment adapted from NOVA, a team of archaeologists and engineers explores different uses of the lever by recreating the engineering feats of the ancient Easter Island peoples. [4:50]

Learn about the wonderful uses of lever in this song. [3:04]

PBS Kids: Animations: How Does a Lever Work?

A lever is a simple machine. See how it works. [0:23]

More on mechanical advantage, levers and moments. [6:50]

Answer the questions after watching a silent video demonstrating a lever. Also included are videos on mechanical advantage levers.

The lever is one of the most basic forms of a machine. They help us lift loads with lesser effort. Even though this looks simple there are many things going on in order to lift the object easily. Check out this quick video clip. [1:08]

Find out about the lever, one of the most basic forms of a machine, which helps lift heavy objects with much less effort, through this fun and animated learning module.