“Nearly everyone is familiar with how a wedding ring or a coin spins and wobbles around on a tabletop. But as the video above shows, in the end the two shapes follow different paths, and physicists have explained why. When a coin or disk spins, its edge circles in the same direction as its center, so it executes a wobbly spiral. A ring starts out making the same sort of spiral, but as it winds down the rotation of its center suddenly changes to opposite that of the edge, so that the ring follows an S-shaped path.” David Shultz
Why do you think that is? Have your kids test it for themselves and form a conclusion, then click here to find out.