Magnetometer. Magnetism 101: The Animated TextVook. Kid Science: Physics Experiments. Exploriments : Electricity - Ohm's Law and Resistance of Devices in Electrical Circuits. Green Planet 4 Kids. EnergyHogs. Isaac Newton's Gravity HD. Touch Physics HD. Wind Tunnel. TinkerBox HD. Coaster Physics. Physics Pad HD for iPad on the iTunes App Store. Particle Zoo.