A boy is pushing hard on a wall. Is he doing work?

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Can't say

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May have done some work

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Yes

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Solution

The correct option is D No
$Work = Force \times Displacement$
Here, the wall is not moving although the boy is pushing hard. $∴ Displacement = 0$
$∴ Work = 0$

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A boy is pushing hard on a wall. Is he doing work?

The correct option is D NoWork=Force×DisplacementHere, the wall is not moving although the boy is pushing hard. ∴Displacement=0∴Work=0

The correct option is D No
$Work = Force \times Displacement$
Here, the wall is not moving although the boy is pushing hard. $∴ Displacement = 0$
$∴ Work = 0$