Motion in Two Dimensions

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Motion in two dimensions is a key building block in the study of physics. Make sure you've got the basics down with free interactive physics tools, equation sheets, two-dimensional motion videos and more.
In this video, Salman Khan of Khan Academy introduces the basic concepts of motion. Part 2 of 3.

Moments of inertia for various bodies

Hundreds of free games illustrating basic principles of physics.

In this video, Dr. Radi Al-Jishi provides an introduction to the basic math used in physics.

This website provides not only an explanation of how the ballistic pendulum can be used to measure the speed of a bullet but also a calculator to check your work. It can be used to explain a similar assembly involving a spring instead of a pendulum as well. You simply substitute the equation for the potential energy of a spring for (M+m)gd -- the potential energy of the pendulum.

Physics

Need to study for Physics? Here are some questions to help you out!!!

In this video, Salman Khan of Khan Academy explains projectile motion. Part 9 of 10.

Interactive Java applets that can be downloaded or run from the website. Graphics are excellent. Covers several less common topics, e.g. in heat and thermodynamics.

Explanations, formulae, and excellent illustrations covering the fundamentals of uniform circular motion and centripetal force.

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