I have a few questions. They are very basic and stupid but I need to understand. Please correct me if I am using wrong terms or some of my facts are wrong. The first one is about potential energy. Now, imagine a ball is held up high above the ground. You would say it has potential energy, that it has "stored energy". Now imagine that the ground has disappeared and the ball is let go, and there are no forces acting upon the ball, but we do have a frame of reference. Would the ball move? If it does, I understand that it definitely stores energy, so where and how is this energy stored in the ball? My second question is about magnetism. Now everyone says that magnets store energy when the domains are tapped into place. But isn't that energy lost in moving the domains into place? So where do domains get the energy to repel or attract? Do domains exert force on each other all the time and are just cancelled out?