The orange dot on each spoke tracks rolling direction. Pause + Step to watch the transition frame by frame. Swap surfaces to see bending in the opposite direction.
The orange dot on each spoke tracks rolling direction. Pause + Step to watch the transition frame by frame. Swap surfaces to see bending in the opposite direction.
HTML5 Physics Demo
Two wheels on a rigid axle cross from a fast surface to a slow one. The leading wheel slows first, turning the whole system toward it — exactly as a wavefront bends when entering a denser medium.