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Angular displacement
Angular displacement is the angle through which an object moves on a circular path. It is measured in radians.
Angular velocity
Angular velocity ($\omega$) is the rate of change of angular displacement. It is measured in radians per second (rad/s).
Centripetal force
Centripetal force is a force that acts on a body moving in a circular path and is directed towards the centre around which the body is moving.
Period
The period ($T$) is the time taken for one complete revolution.