Question

explain why is uniform circular motion,the work done is zero

Answer 1

Work is defined as dot product of force and displacement.

Work=F·r (F=torque in circular motion)

In uniform circular motion, the angular velocity is constant , so angular acceleration of object =0.

As F =mα=0

the work will also 0.

Answer 2

in uniform circular motion displacement =0

work done = force × displacement
as, displacement =0

so, work done =0

thats why in uniform circular motion work done is 0

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