Wolfram Demonstrations Projecthttp://demonstrations.wolfram.com/An Open Resource of Interactive Mathematica VisualizationsCopyright 2009 Wolfram Demonstrations Project & ContributorsForced Oscillations of a Damped Oscillatorhttp://demonstrations.wolfram.com/ForcedOscillationsOfADampedOscillator/]]>http://demonstrations.wolfram.com/ForcedOscillationsOfADampedOscillator/Rolling a Half-Weighted Diskhttp://demonstrations.wolfram.com/RollingAHalfWeightedDisk/]]>http://demonstrations.wolfram.com/RollingAHalfWeightedDisk/