Is it possible to make a perpetual motion machine by taking a jar which is a vacuum, and surrounding it with a magnet then bouncing a magnet marble inside? - Shravan Surendran (age 13) Ann Arbor, MI, U.S.A
A:
Nope. It's not possible to make any perpetual motion machine. In the particular case you describe, the oscillating magnetic marble will radiate electromagnetic waves, and thus gradually lose energy.
