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# Form 4 Physics uniform circular motion online lessons

Definition of an angular velocity

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angle θ with time. ω= θ / t, unit for angular velocity is radians per second (rads^-1).
-Since the radian measure is a ratio we can write it as second^-1 (s^-1).
- We can establish the relationship between angular velocity ‘ω’ and linear velocity ‘v’, from the relation, θ = (arc) / (radius), arc = radius × θ.
-Dividing the expression by ‘t’, then (arc) / t = radius, but #(arc) / t = v (angular velocity). So ‘v’ =radius × ω.