On a roller coaster<span>, </span>energy<span> changes from </span>potential<span>to </span>kinetic energy<span> and back again many times over the course of a ride. </span>Kinetic energy<span> is </span>energy<span> that an object has as a result of its motion. All moving objects possess </span>kinetic energy, which is determined by the mass and speed of the object.
