Physics Work, Energy, Power and Collision Work Done by Constant and Variable Force MCQ (Single Correct)

No work is done by a force on an object if

A
the force is always perpendicular to its velocity
B
the force is always perpendicular to 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.

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The correct answer is:
CHECK THE SOLUTION.

(a, c, d)

dW F = , if perpendicular to then

dW F = 0, is displacement of point of application of force, = .

, , are true.

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