# Illustration Tangential and Angular Acceleration during Non-Uniform Circular Motion

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A body moves on a circular orbit with radius $$r$$ and accelerates with tangential acceleration $$a_{\text{tan}}$$. This causes the tangential orbital velocity of the body to increase or decrease with time.

The angular acceleration $$\alpha$$ is parallel or antiparallel to the axis of rotation, depending on whether the body is accelerating or decelerating on the circular path.