No work is done by a force on an object if: - Vidyadip

MCQ

No work is done by a force on an object if:

A
The object is stationary but the point of application of the force moves on the object.
B
The object moves in such a way that the point of application of the force remains fixed.
C
The force is always perpendicular to its velocity.
✓
All of the above

✓

Answer

Correct option: D.

All of the above

$\text{W}=\text{Fs}=\cos\theta=0$, when either $s = 0$ or $\theta=90^\circ$
i.e., when object is stationary but the point of application of the force moves on the object or object moves in such a way that point of application of force remains fixed; or force is at $90^\circ$ to the acceleration.

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