State two conditions when no work is done by a force.
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The two conditions where no work is done by a force are:
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Define work.
When does a force perform work?
In which of the following cases is work being done:
(a) A boy pushing a heavy rock
(b) A boy climbing up the stairs
(c) A coolie standing with a box on his head
(d) A girl moving on the road.
Write the expression for work done by a force.