As the acceleration vector is perpendicular to the plane where the rotation occurs, the acceleration vector is perpendicular to that plane. An acceleration velocity that points away from the observer is created by increasing angular velocity clockwise. The vector of angular acceleration points to the viewer if the increase in angular velocity is counter clockwise.
The SI unit of angular acceleration is the radian per second squared (rad/s2) and it is often denoted by the alpha (α).
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