http://youtu.be/mh1zZGwzQyU

In this video, we explore the velocity of a MOVING point on a rotating frame, as it appears to a stationary observer.  Or, how does the dot on the merry-go-round seem to move, from your friend’s perspective?  More precisely, what is the absolute velocity in a fixed reference frame, of a moving particle in a rotating, translating relative frame?