When a body moves with a constant speed along a circle (a) no work is done on it (b) no acceleration is produced in it (c) its velocity remains constant (d) no force acts on it

Answer: (a). In uniform circular motion the net (centripetal) force is always perpendicular to the velocity. W = Fscos 90° = 0, which agrees with constant speed (no change in KE). There is centripetal acceleration and the velocity direction changes, so (b), (c), (d) are false. So the answer is (a) no work is done on it.

When a body moves with a constant speed along a circle | NEET 1994 (AIPMT)

Q25NEET 1994 · AIPMTEasy

Work by a Constant Force

When a body moves with a constant speed along a circle

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Answer: (a)

In uniform circular motion the net (centripetal) force is always perpendicular to the velocity.
$W = Fs\cos 90^\circ = 0$ , which agrees with constant speed (no change in KE).
There is centripetal acceleration and the velocity direction changes, so (b), (c), (d) are false.
So the answer is (a) no work is done on it.

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Work by a Constant Force question from NEET 1994 (AIPMT)

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