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| unit of measure for work; Newton times meter |
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| unit used to measure power; joule per second |
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| what enables things to do work |
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| Energy used with help from machines |
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| Gravitational potentional energy |
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| 1/2 mass times speed squared |
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| device used to multiply forces or simply to change the direction of forces |
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| work done on one end is transferred to work on the load on the other side of the fulcrum |
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| ratio of output force to input force |
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| a kind of lever that can be used to change the direction of a force |
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| useful work output/ total work input |
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