Gravitational potential energy is the potential energy an object has due to its position in a gravitational field. The higher an object is the greater its gravitational potential. When it falls the gravitational potential becomes kinetic energy.
Energy stored in height differences ~APEX
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Gravitational potential energy is the kinetic energy that an object could gain if it was allowed to move through the entire gravitational potential in question. For example, if you climb a tower that is 100 feet above the Earth's surface and hold a ball, the ball will have potential energy as long as it remains at that height (in other words, as long as it remains at that potential). If the ball is dropped, the potential energy begins converting into kinetic as the ball falls through the 100 foot gravitational potential. When the ball is on the surface of the Earth, it no longer has any gravitational potential energy with respect to the Earth's surface. All of the energy converted into kinetic energy. When the ball actually hit the Earth, the kinetic energy was converted into heat and the ball stopped moving. That heat warmed the surrounding atmosphere a bit. No energy is ever lost, it just converts from one form to another.
Potential energy that is dependent on height is called gravitational potential energy. Potential energy is energy of position. ex: A book on a shelf has gravitational potential energy. Formula: G.P.E.=Weight x Height