A pair of forces of equal magnitude but acting in opposite directions with different lines of action

Question

A pair of forces of equal magnitude but acting in opposite directions with different lines of action is known as a couple. Which of the following best describes the motion produced by a couple on a rigid body?

Professor PC Thomas Classes · Answer

A couple consists of two equal and opposite forces whose lines of action do not coincide. The net force is zero, meaning there is no translational acceleration. However, the net torque is non-zero, producing pure rotational motion.