Wolfram Demonstrations Projecthttp://demonstrations.wolfram.com/An Open Resource of Interactive Mathematica VisualizationsCopyright 2009 Wolfram Demonstrations Project & ContributorsCart with Pendulumhttp://demonstrations.wolfram.com/CartWithPendulum/]]>http://demonstrations.wolfram.com/CartWithPendulum/Pendulum with an Oscillating Supporthttp://demonstrations.wolfram.com/PendulumWithAnOscillatingSupport/]]>http://demonstrations.wolfram.com/PendulumWithAnOscillatingSupport/Bead on a Rotating Hoophttp://demonstrations.wolfram.com/BeadOnARotatingHoop/]]>http://demonstrations.wolfram.com/BeadOnARotatingHoop/