The two types of energy are kinetic and potential energy. Kinetic energy is the energy of motion, and potential energy is energy that is stored. A hurled watermelon has kinetic energy, and a precariously perched watermelon has potential energy. The hurled watermelon is moving, and the perched one has the potential to fall and create kinetic energy.
The precariously perched watermelon is an example of gravitational potential energy. A watermelon in a catapult has elastic potential energy, for when the catapult goes off the stationary watermelon becomes a hurled watermelon.
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