Extensive collection of experiments illustrating fundamental principles of physics. Demonstrations on this disc: Friction - air track friction, static vs. sliding friction, area dependence of friction, weight dependence of friction, surface dependence of friction, stability of rolling car; Work, Energy, and Power - pile driver, spring pong gun, spring jumper, x-squared spring energy dependence, high bounce paradox, energy well track, Galileo ’s pendulum, bowling ball pendulum, triple track, hand cranked generator, generator driven b y falling weight, prony brake; Center of Mass - stability, irregular object center of mass, center of mass disc, chair on pedestal, clown on rope, double cone on incline, loaded disc, toppling cylinders, air table center of mass. Kit contains: DVD with English and Spanish audio tracks and subtitles, and bilingual study guide.