I have some neodynimum magnets I am observing. I put a couple on a bathroom tile and they seem to align themselves with earths magnetic pole. If I spin them they slow down very quickly and align back to the N/S pole. If I were to do the same experiment with non-magnetic pieces of metal they would spin for longer before friction and air resistance would bring it to a halt. Where does the the energy go when a force is applied to spin a magnet in a magnetic field? :shrug: As energy can neither be gained or lost in a closed system.