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Answer» ▶️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.
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