Question

A force F acts on an object undergoing a displacement s, the force being oriented at an angle θ with respect to the displacement. Which one of the following correctly describes ALL of the circumstances under which the work done by the force is zero?

Answer 1

a) The force is zero, or the displacement is zero, or the angle is 180 degrees

b) The kinetic energy, speed, and velocity of the particle change.

c) W1 = - W2