Energy is what makes things work. There are two main categories of energy, potential energy and kinetic energy. Potential energy is stored energy. For example, when a roller coaster is slowly creeping up a hill, it has potential energy which is stored inside of it. That potential energy soon turns to kinetic energy when the roller coaster zooms down the hill. Kinetic energy is the energy of movement/motion.
Great examples of potential and kinetic energy!
Ms. Holtzer