Question

Suppose the platform with the kid in the previous problem is rotating in anticlockwise direction at an angular speed ω. The kid starts walking along the rim with a speed v relative to the platform also in the anticlockwise direction. Find the new angular speed of the platform.

Answer 1

From a inertial frame of reference when we see the (man wheel) system, we can find that the wheel moving at a speed of ω and the man with (ω + V/R) after the man has started walking. (ω' = angular velocity after walking, ω = angular velocity of the wheel before walking.