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__Potential energy__- energy that is stored in by an object.

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__Gravitational potential energy__- achieved by doing work against the force of gravity.

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__Work__- the transfer of mechanical energy.

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__Kinetic energy__- the energy of motion.

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__Mechanical energy__- combination of kinetic and potential energy.

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__Work-Kinetic energy theorem__- the special relationship between doing work on an object and the resulting kinetic energy of the object.

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__Negative work__- removes energy from an object.

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__Positive work__- adds energy to an object.

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__Conservative force__- when a force does work on an object and the amount of work done is independent of the path taken.

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__Non-conservative force__- when a force does work on an object and the amount of work done is path-dependent.