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Question

A man pushes a wall and fails to displace it. He does


A

Negative work

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B

Positive but not maximum work

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C

No work at all

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D

Maximum work

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Solution

The correct option is C

No work at all


Explanation for the correct option:

Option (C): No work at all

Work = Force x Displacement

As man fails to displace the wall, displacement of the wall is zero. [Applied force is not zero]

So, the work done will be zero.

Explanation of the incorrect options:

Option (A): Negative work

When the direction of applied force and displacement are in opposite direction.

Example- work done against gravity, frictional work etc.

Option (B): Positive but not maximum work

When the direction of applied force and displacement are in the same direction.

Example- pushing chair, kicking football etc.

Option (D): Maximum work

Direction of applied force and displacement are in same direction and angle between them is zero.

Hence, Option (C) is correct.


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