Vocabulary
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| done only when force causes a change in the position or the motion of an object in the dirction of the applied force. | work
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| the rate at which work is done, that is, how much work id done in a given amount of time. | power
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| defined as the ratio between the output force and the input force. | mechanical advantage
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| one of the six basic types of machines, which are the basis for all other forms of machines. | simple machines
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| combines two or more simple machines. | compound machines
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| results from the relative positions of objects in a system. | potential energy
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| the energy that an object has because it is in motion. | kinetic energy
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| the sum of the potential energy and kinetic energy in a system. | mechanical energy
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| defined as the ratio of useful work output to total work input. | efficency
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