Circular motion is the rotation along a circle.  Uniform circular motion has a constant angular rate of rotation.  Objects in ciruclar motion have tangential speed, shown by v in the diagram on the right.  Centripetal accelertion is represented by a. Giant swings around the bar show uniform circular motion.

Centripetal Acceleration 

a = v2 / r

Centripetal Force 

F = ma = mv2/r

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