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Q..No work is done by a force on an object if-
(a) the force is always perpendicular to the velocity
(b) the force is always perpendicular to its acceleration.
(c) the object is stationary but the point of application of the force moves on the object
(d) the object moves in such a way that the point of application of the force remains fixed.
one or more than one correct answer question.....
Dear suhel malik
Option a,c,d are correct.
option a is correct W=F.x cosΘ here Θ is 90 so wor done is zero
option c is correct because x is zero
option d is correct because x is zero
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