Question

A person pushes a wall for half hour and the wall do not move from its place and gets tired. Has he done some work or not? Justify your answer.

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Answer 1

Answer:

no

Explanation:

Because wall did not move at all.

Answer 2

Explanation:

Your question:-

A person pushes a wall for half hour and the wall do not move from its place and gets tired. Has he done some work or not? Justify your answer.

Your solution:-

In terms of physics work done is defined differently as compared to our day-to-day work. In physics work is defined as the dot product of Force(F) and displacement(x)

Work=F•d

Work=F×d cos∅ (removed dot product)

According to your question, man tries to move the Wall but wall does not move means there is no displacement of any kind after applying force on it.

So displacement (x)= 0

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Now according to work done formula:-

W=F×d×cos∅

W=F×0×cos∅

W=0

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Conclusion:-

If there is no displacement we can conclude that work done will be zero. So there no work done.

Extra information:-

1. When there is no displacement and the given force is conservative then after work done will be zero
2. If there is no displacement and the given force is non conservative then work done may not be zero.