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Why is the work output of any real machine less than the work needed to operate it? work is gained due to friction work is lost due to friction friction reduces the work input

Why is the work output of any real machine less than the work needed to operate it? work is gained due to friction work is lost due to friction friction reduces the work input
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Why is the work output of any real machine less than the work needed to operate it?

work is gained due to friction
work is lost due to friction
friction reduces the work input

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User Mireia
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work is lost due to friction
answered
User Shihongzhi
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