Suppose we use a string to suspend a ball from a hook in the ceiling. As the ball swings back and forth, which interaction does work on the system if
-we consider the system to be the ball or

Question

Quizplus · Accepted Answer

The ball's gravitational interaction with the Earth does work on the system as it causes the ball to move in a vertical direction, converting potential energy into kinetic energy and vice versa. The tension in the string only changes the direction of the ball's motion, not its energy.

Suppose We Use a String to Suspend a Ball from a Hook