Question

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

A
the force is always perpendicular to its acceleration
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B
the object is stationary but the point of application of the force moves on the object
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C
the force is always perpendicular to its velocity
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D
the object moves in such a way that the point of application of the force remains fixed
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Solution

## The correct options are C the force is always perpendicular to its velocity D the object moves in such a way that the point of application of the force remains fixedWork done W=F⋅dx=F⋅dxdt⋅dtWork done by a force on an object is zero, if:The force is always perpendicular to its velocity (dxdt=0). The object moves in such a way that the point of application of the force remains fixed (dx=0).

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