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Work done by a force on an object is zer...

Work done by a force on an object is zero, if

A

the force is always perpendicular to its velocity

B

the force is always perpendicualar its acceleration

C

the object has no motion but the point of application of the force moves on the object

D

the object moves in such a way that the point (of the body) of application of the force remains fixed.

Text Solution

Verified by Experts

The correct Answer is:
A, C, D
`dW_(F)=vecF.dvecs` if `vecF` perpendicular to `dvecs` then
`dW_(F)=0,dvecs` is displacement of point of application of force `vecv=(dvecs)/(dt)`
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