The dancing Disc
A coin that spins and spins and spins....
The Dancing Disc is significantly larger and heavier than an ordinary coin. In addition, the side edges of the disc have been optimised so that friction losses are particularly low. That's why it spins all the longer and more impressively.
Give the dancing disc a good push. Due to its weight, it tilts a little more with each revolution, becomes faster and louder in the process. To put it simply, the disc gains the energy needed for the ever faster dance from the approach of its centre of gravity to the base surface: At the beginning it is straightened up, and the force needed for this is in the disc as potential energy ("position energy"). This is released when the disc tilts, and it is converted into rotational movement energy.
This cardboard kit for a dancing disc is a bow to the ingenious mathematician Leonhard Euler and dedicated to his memory. It was he who first summarised the process of rotation in several mathematical formulae, the Euler equations.
Dimensions of product: Diameter of disc: 7.5 cm, height of disc: 1.3 cm, diameter of mirror: 20 cm
Scope of delivery: Cardboard kit for the mirror's frame, 2 stickers made of brass foil to stick on the coin.