The Key Science Concept - Force Unit Activity Forms of Energy First Class Lever Forms of Energy Effect of Force Acting on Varying Masses Forms of Energy Equal and Opposite Forces Forms of Energy Momentum on a Skateboard Forms of Energy Balloon Rocket Forms of Energy Transfer of Kinetic Energy Forms of Energy Heat Produced by Friction Forms of Energy Wave Energy in a String Telephone Forms of Energy Transfer of Kinetic Energy to Sound Energy Forms of Energy Moose Call