When we push a wall the wall does not move so, no work is done but still we get tired Why? What energy changes occur in this process.
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3Do you get tired when you lean on a wall? Because that is also pushing on it ;) – Chris Mar 11 '18 at 12:17
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4Possible duplicate of Why does holding something up cost energy while no work is being done? – John Rennie Mar 11 '18 at 12:19