Question

Many accelerations act on a particle in circular motion, there is total acceleration from centripetal acceleration and tangential acceleration. But there is also angular acceleration. So why isn't it included in total acceleration?

Answer 1

Angular acceleration is defined as the rate of change of the angular velocity. Angular acceleration comes into play only when there is a change in the angular velocity.
It is so because the linear acceleration and angular acceleration in case of uniform circular motion is zero.