Although they don't want to lose their meeting spot, the science club agrees to share the space as long as the playground has a science theme. The science teacher says that a playground uses the physics of movement, energy, friction, and simple machines. You can change your potential energy into kinetic energy when you play on the lever, spin on the centrifuge, and use friction on the inclined plane. If not, it is only because these are the words used in physics for what happens on a playground. The things you like to do in a playground involve energy and simple machines.
Potential energy is stored energy.
That potential energy can change into kinetic, or moving, energy.