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# Form 4 Physics uniform circular motion online lessons

Definition and formula for calculating Angular acceleration

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-If the angular velocity for a body changes from ‘ω1’ to ‘ω2’, in time ‘t’ then the angular acceleration, α can be expressed as; α= (ω2 – ω1) / t
-Units for angular acceleration are radians per second squared (rad s^-2) or second^-2 (s^-2).
-To establish the relationship between angular acceleration and linear acceleration, from the relation, v = radius times ω, then dividing by ‘t’,
we get (v/ t) =( radius × ω) / t.But v / t = a (linear acceleration) and ω / t = α (angular acceleration). So a = radius × α.