Question

In which situation is no work considered to be done by a force?

Answer 1

Answer:

O B. when the angle between the force and displacement is 90°

Explanation:

work defined as   $w = f cos Ф * d$.

work  can only be done if object moves(displacement) in the direction of force. now a quick one. if you since the varrious angles into the cosine, you would see that Cos 90 will give zero which implies that no work is done. Again, angle means it is perpendicular and so it is not in the direction of force.