Question

5 example of zero work done???

Answer 1

▶️Work is zero if applied force is zero (W=0 if F=0): If a block is moving on a smooth horizontal surface (frictionless), no work will be done.

▶️▶️Work done is zero when displacement is zero. This happens when a man pushes a wall. There is no displacement of the wall. Thus, there is no work done.

▶️▶️▶️When a porter carrying some load on his
head moves on a horizontal platform, q = 90°,
therefore the work done by the porter is zero.

▶️▶️▶️▶️ For a body moving in a circular path, the
centripetal force and displacement are
perpendicular to each other. So the work done
by the centripetal force is zero.

▶️▶️▶️▶️▶️man having some load on his head and standing for a while.