Question

When is the work done by a force on a body said to be zero ? give two examples​

Answer 1

$\huge\underline\mathrm\green{Answer:-}$

The work done is said to be zero work when force and displacement are perpendicular to each other or when either force or displacement is zero.

$\huge\underline\mathrm\green{Examples:-}$

$\red\rightarrow\mathrm{A\: men\: carrying \:bag \:on\: his\: head,\:the}$ㅤㅤ$\mathrm{work\: done\: by\: bag\: on\: his \:head \:is \:zero }$

$\red\rightarrow\mathrm{Pushing\: a\: car\: horizontally\: from\:rest}$