The Dancing Disc Kit

This fascinating physics demonstration mesmerises everyone that sees it. The base is a slightly concave mirror. There is then a heavy metal disc, which you place on the mirror, and spin. What happens then? Well, just like spinning a coin on a table, the disc both spins and rolls, until it comes to a sudden stop, the final stages being accompanied by a sound of increasing frequency. A coin spun on a table will not spin for very long. The Dancing Disc, by contrast, spins for a long time before coming to rest. The steel disc weighs 450 grams, and can easily be made to spin for a minute and a half or even longer! The best thing really is to watch the video. It is a lot of fun showing this to someone who has not seen it before - the fact that it spins for so long is surprising, as is the ending. The ending is not only spectacular, it also has a spectacular name - a finite-time singularity! The kit requires some construction in order to complete the base. The kit includes: cardboard parts for the mirror bezel, 2 brass foil stickers for the disk Disc diameter: 7.5 cm Disc thickness: 1.3 cm Disc weight: 433 g Mirror diameter: 20 cm The mirror is made of glass, and therefore we recommend that it is suitable for Age 14+. It is suitable for younger children under supervision. This is not a toy. For customers in North America, we suggest you buy this item instead - https://www.toysmith.com/products/eulers-disk