Potential and Kinetic energy.
Kinetic energy definition- energy that a body possesses by virtue of being in motion.
Potential energy definition- Is energy that is not in use yet.
So potenential energy is energy that is stored up and can be used but isnt yet. For example, a basketball has potential energy when you are about to dribble it. Once it hits the ground and come back up that is kinetic energy.
When the roller coaster gets to the top it has whats called stores potential energy, because once it goes down it converts the energy into kinetic energy. Any object that is moving has kenetic energy.