## angular accelerationThe rate of change of angular velocity. The average angular acceleration of an object whose angular velocity changes from ω_{1} to ω_{2} over time t is (ω_{2} - ω_{1})/t.
Instantaneous acceleration is the value approached as t becomes
small. The direction of the angular acceleration vector is perpendicular to the plane of motion. The tangential acceleration a of a particle at a distance _{T}r from a fixed point is rα,
where α is its angular acceleration. ## Related entry• acceleration## Related category• CLASSICAL MECHANICS | |||||

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