When a body moves in a circle with constant speed , it is said to be in uniform circular motion .
Explanation:
When an object moves in a circular path , its direction changes at each point .
This change in direction result in change of velocity (velocity is vector quantity which changes if direction of the object change) .However speed do not change (it is scalar quantity , not affected by Direction)
The Change in velocity produce acceleration ( a = v - u)
Hence The object always produce acceleration in uniform circular motion .So, Some force (centripetal force) is needed to keep the object in circular motion.
