Circular motion refers to the movement of an object along the circumference of a circular path. This type of motion can be classified into two main categories: 1. **Uniform Circular Motion (UCM)**: In uniform circular motion, an object moves around a circle at a constant speed. Although the speed remains constant, the velocity is constantly changing because the direction of the object's motion is continually changing. This is due to centripetal acceleration, which acts towards the center of the circular path.
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In circular motion, a particle remains at a fixed distance from a centre. For uniform angular velocity , its speed is and its acceleration points toward the centre, with magnitudeThe speed can remain constant while the velocity changes continuously because its direction changes. A net inward force is therefore required even for uniform circular motion.
A small object attached to a string illustrates the mechanism: the string's tension supplies the inward force. If the string breaks, the object's initial unconstrained motion is along the tangent, in accordance with its instantaneous velocity. When the speed also changes, there is an additional tangential acceleration; the inward component remains present.