Take a look at an organized physics course. The 34-section electronic textbook covers material in AP® Physics 1 and 2. Teachers use the text to supplement lectures and have the class work through the labs. Each section contains...

Text of the short story "The Pit and the Pendulum" by Edgar Allan Poe. (Free site registration offers some additional features, e.g., the ability to insert annotations.)

The motion of a pendulum is a classic example of mechanical energy conservation. See the mechanics at work here in this animation.

In this interactive exercise, explore the quantitative relationship between work and mechanical energy in situations in which there are no external forces doing work.

A physics definition of collisions with examples to illustrate the concept and related links to problems and solutions.