Question

a. No work is done by a force when its point of application moves in a

direction that is at right angles to its line of action. Explain with an

example.​

Answer 1

Explanation:

Work is scalar product of force and displacement.

W = f s cos (theta)

theta is angle between force and displacement. Since cos 90 = 0, therefore work done is zero.

In circular motion, angle between centripetal force (along radius)and linear displacement ( along tangent) is 90 degrees , work done is zero.