Wolfram Demonstrations Projecthttp://demonstrations.wolfram.com/An Open Resource of Interactive Mathematica VisualizationsCopyright 2009 Wolfram Demonstrations Project & ContributorsBouncing Bob Pendulumhttp://demonstrations.wolfram.com/BouncingBobPendulum/]]>http://demonstrations.wolfram.com/BouncingBobPendulum/Sliding on a Parabolic Trackhttp://demonstrations.wolfram.com/SlidingOnAParabolicTrack/]]>http://demonstrations.wolfram.com/SlidingOnAParabolicTrack/Optimizing the Counterweight Trebuchethttp://demonstrations.wolfram.com/OptimizingTheCounterweightTrebuchet/]]>http://demonstrations.wolfram.com/OptimizingTheCounterweightTrebuchet/Motion of Pendulum with Varying Lengthhttp://demonstrations.wolfram.com/MotionOfPendulumWithVaryingLength/]]>http://demonstrations.wolfram.com/MotionOfPendulumWithVaryingLength/