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Energy - the ability to do work
Kinetic energy - energy that an object has due to its motion
Gravitational potential energy - stored energy that results from the position or shape of an object
Energy transfer - the movement of energy from one object or place to another
Law of conservation of energy - the law that states that energy cannot be created or destroyed but can be changed from one form to another
Potential energy - the potential energy of an object due to its height, or its position relative to the earth's surface
Joule - unit of energy