Wolfram Demonstrations Projecthttp://demonstrations.wolfram.com/An Open Resource of Interactive Mathematica VisualizationsCopyright 2009 Wolfram Demonstrations Project & ContributorsMotion of an Object Subject to Forces in One Dimensionhttp://demonstrations.wolfram.com/MotionOfAnObjectSubjectToForcesInOneDimension/]]>http://demonstrations.wolfram.com/MotionOfAnObjectSubjectToForcesInOneDimension/Electric Field of a Point Chargehttp://demonstrations.wolfram.com/ElectricFieldOfAPointCharge/]]>http://demonstrations.wolfram.com/ElectricFieldOfAPointCharge/