I work in an electric motor shop and we use overhead cranes to move the motors around the shop. When a crane moving a motor stops, the inertia and momentum of the motor causes the motor to continue moving. It now becomes a pendulum like object that swings back and forth. A method we use to dampen the swing is to try to move the crane in either direction right when the motor reaches the highest point in that direction. From a physics standpoint, why does this help to dampen the swing?