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'''Effort''' is the expenditure of physical and/or mental powers which are required to produce something worthwhile, often referring to hard [[work]], great [[insight]] or overcoming difficulty.
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It may also apply to the product of the work, so that a [[teacher]] may say "That essay was a great effort."''
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In [[classical mechanics]], effort is the [[force]] or [[energy]] that is applied to a [[machine]] for the accomplishment of useful work.