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Angular acceleration

The last analogy with linear motion is the concept of angular acceleration. As with angular velocity, one first introduces the average angular acceleration between two points A and B as

Average angular acceleration = change in angular velocity over time

and then the instantaneous angular acceleration at A is defined to be the average angular acceleration between A and a point B as the point B approaches A:

The instantaneous angular acceleration at {\b...
...ation between
{\bf A} and {\bf B} as {\bf B} approaches {\bf A}.

Angular acceleration is measured in radians / second2.