Question

a man pushes a wall and fails to displace it he does work or not if yes the work is positive or negative?

Answer 1

no he does not do any work
since work=force x displacement

Answer 2

Answer: The correct answer is "no work done".

Explanation:

The expression for the work done is as follows;

W= Fs

Here, F is the applied force and s is the displacement.

The work is to be done when the applied force on the object displaces it to some distance.

The work done is negative when the body displaces in an opposite direction to the applied force.

The work done is positive when the body displaces in the same direction to the applied force.

In the given problem, a man pushes a wall and fails to displace it. He does not do any work as the wall is not displaced in this case.

Therefore, the work done in this case is zero.