Greeshma+-+Rotational+Motion

My little sister's spinning bicycle wheel is an example of circular motion. The axis of rotation, in this case, is the axle of the bike. Every point on the circle formed by the wheel moves the same degree in a particular time interval. The angle it moves is usually measured in radians. Angular displacement is defined as the amount of rotation. It can be calculated by dividing the change in arc length by the distance from the axis. The wheel's rotational speed (angular speed) is the ratio between angular displacement and time.
 * Rotational Motion**