Circle is a polygon having an infinite number of sides. So, when a particle moves in a circular path, it changes its direction at each point ie. an infinite number of times.This note provides us an information about some important terms in circular motion
A body of mass m is tied with a string of length l and then revolve around in the verticle circle of radius (r) is equal to the length of the string . If a body is tied by a weightless and inextensible string over the rigid support and moves in a horizontal circle then the body is called conical pendulum.