First slide

Work done by Diff type of forces

Question

An object is moving in a circle with constant speed. If F be the resultant force acting on the object, then the amount of work done on the object by this force is zero :

Easy

A

sometimes
B

frequently
C

always
D

never

Solution

For uniform circular motion, the centripetal force acting on the object and its instantaneous tangential displacement are always perpendicular to each other and hence the work done by the force is always zero.

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