circular motion公式v=rw既問題..

Your quoted equation is a gneral equation connecting the angular velocity w with the linear velocity v. It can be applied in almost alll situations.

A rotating rod withe one end fixed will have all points on the rod rotating at the same angular velocity w. But the linear velocity v of a point on the rod depends on its distance from the axis of rotation (i.e. the fixed end of the rod). The linear velocity v increases proportionally with its distance r from the fixed end of the rod, as given by the equation v = rw