# 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. Khan Academy In this video, Dr. Radi Al-Jishi provides an introduction to the basic math used in physics. Educator.com Moments of inertia for various bodies http://en.wikipedia.org/wiki/List_of_moments_of_inertia Hundreds of free games illustrating basic principles of physics. PhysicsGames.net Need help solving a two-dimensional motion problem in which an object rolls off a ledge? In this video, a Tutor.com physics tutor shows you how to find how long it will take the object to fall to the ground, and then calculate how far the object will travel horizontally in that time interval. Tutor.com video with NASA film and voiced explanation of "weightlessness" YouTube 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. Physics Education Technology Project A list of equations and constants for AP Physics B and C exams, organized by subject. PhysicsLAB 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. Hyperphysics Physics StudyStack
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