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Question
State whether work is done or not by writing yes or no, in the following cases:
(a) A man pushes a wall.
(b) A coolie stands with a box on his head for 15 min.
(c) A boy climbs up 20 stairs.
State whether work is done or not by writing yes or no, in the following cases:
(a) A man pushes a wall.
(b) A coolie stands with a box on his head for 15 min.
(c) A boy climbs up 20 stairs.
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Solution
(a) No, as there is no displacement.
(b) No, as there is no displacement.
(c) Yes, work is done against gravity.
(a) No, as there is no displacement.
(b) No, as there is no displacement.
(c) Yes, work is done against gravity.
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