Euler's Disk
Chrome plated steel disk and mirror base. When the Euler's Disk is spun, the disk contains both potential and kinetic energy. The potential energy is given to the disk when it is placed upright on its side. The kinetic energy is given to the disk when it is spun on the mirrored base. The Euler's Disk would spoll (i.e., spin and roll) forever if it were not for friction and vibration.
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