Question

Read the given statement carefully and answer whether work is done or not done, and why?

A man pushing a wall.

Answer 1

1. Work is said to be done only when the applied force causes some displacement of a body in its own direction.
2. We know that, $$\begin{gathered} Workdone\left(W\right)=Force\left(F\right)\times displacement\left(s\right) \\ W=F\times s \end{gathered}$$
3. Given that man pushes a wall and fails to displace it, so displacement is zero i.e.,$s=0$
4. $W=F\times 0=0$

Hence, work is not done when a man pushes a wall.