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3 June, 20:36

Explain how machines can be useful if the output is always less than the input work

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  1. 4 June, 00:13
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    Because: Some of the work done by the machine is used to overcome the friction created by the use of the machine ... Work output can never be greater than work input. Machines allow force to be applied over a greater distance, which means that less force will be needed for the same amount of work.
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