Answer the following question briefly:
Tie a small stone to one end of a thread and hold the other end to rotate it in a circular path at constant speed. Release the thread and observe the direction in which the stone moves. Repeat this by releasing the stone at different points and check whether the direction remains the same.
A stone describing a circular path with a velocity of constant magnitude
This clearly shows that the direction of motion of that stone is at every point when the stone was moving along the circular path.
If an object moves with along a circular path, then the motion is called uniform circular motion.
When a stone is moving with a constant speed along a circular path, the of the stone changes due to the change in . Hence it is an motion.