Description
An Euler's disk is an object that is designed to lose energy as slowly as possible. When standing on it's side, the disk's center of mass has gravitational potential energy. When a spin is applied to the disk, it also gains a large amount of rotational kinetic energy -- as well as a small amount of translational kinetic energy. As the disk spins, it slowly loses energy (mainly to friction and air resistance), decreasing the angle between the disk and the concave mirror base. As the energy of the disk decreases, the precession rate increases
Until eventually a high-pitched whirring sound occurs just before the disk comes to a sudden stop.
Aliases
Spinning Disk