Motion on a circular path is an important case of 2-dimensional accelerated motion. Even when speed is constant, the motion is nevertheless accelerated because the direction of motion is changing. A simple expression gives the acceleration in circular motion in terms of the speed and the radius of the circle and shows that the direction of the acceleration is centripetal. Even when speed is changing, description of circular motion is straightforward because centripetal acceleration and acceleration along the direction of motion are considered independently.