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Standard VII
Physics
Question

In which of the following cases, is work being done?
  1. A man pushing a wall
  2. A coolie standing with a load of 12kgf on his head
  3. A boy climbing up a staircase
  4. None of these

A
A man pushing a wall
B
A coolie standing with a load of 12kgf on his head
C
A boy climbing up a staircase
D
None of these
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Solution
Verified by Toppr

In option A, while man is pushing wall,it will not have any displacement and hence, he is not doing any work.In option B, same situation and no work is done as coolie is not moving.In option C, angle between force and displacement is not 900 and it has displacement.Hence, option C is the correct answer.

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Q1

In which of the following cases is work being done :

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(b) A boy climbing up the stairs

(c) A coolie standing with a box on his head

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Q2

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Q5
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