Disks moving in a square grid trace out an interesting pattern as they pass over a rotating wheel. Some traces appear to go towards the centre only to be flung back out, in some cases forming a sharp corner. A few of the traces form loops, as if there was also a force acting sideways rather than outwards. This demonstrates how the Centrifugal and Coriolis ‘forces’ appear to affect the motion of objects in a rotating frame. [making of video (new)] [more] [code]
