when must there be angular acceleration

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https://courses.lumenlearning.com/physics/chapter/10-1-angular-acceleration/

Angular Acceleration | Physics
https://courses.lumenlearning.com/physics/chapter/10-1-angular-acceleration/
Angular velocity is not constant when a skater pulls in her arms, when a child starts up a merry-go-round from rest, or when a computer’s hard disk slows to a halt when switched off. In all these cases, there is an angular acceleration, in which ω changes. The faster the change occurs, the greater the angular acceleration.

https://en.wikipedia.org/wiki/Angular_acceleration

Angular acceleration – Wikipedia
https://en.wikipedia.org/wiki/Angular_acceleration
In two dimensions, angular acceleration is a pseudoscalar whose sign is taken to be positive if the angular speed increases counterclockwise or decreases clockwise, and is taken to be negative if the angular speed increases clockwise or decreases counterclockwise. In three dimensions, angular acceleration is a pseudovector.

https://byjus.com/physics/angular-acceleration/

Angular Acceleration Definition, Units, And Formula
https://byjus.com/physics/angular-acceleration/
Angular Acceleration Definition. It is the rate of change of angular velocity with a time of an object in motion. Acceleration is the change in velocity of a moving object with respect to time. If the object moves on a circular direction than its velocity is called angular velocity. The angular acceleration is also known as rotational acceleration.

https://nigerianscholars.com/tutorials/rotational-motion-angular-momentum/angular-acceleration/

Angular Acceleration | Rotational Motion and Angular Momentum
https://nigerianscholars.com/tutorials/rotational-motion-angular-momentum/angular-acceleration/
Angular velocity is not constant when a skater pulls in her arms, when a child starts up a merry-go-round from rest, or when a computer’s hard disk slows to a halt when switched off. In all these cases, there is an angular acceleration, in which ω ω changes. The faster the change occurs, the greater the angular acceleration.

https://courses.lumenlearning.com/boundless-physics/chapter/torque-and-angular-acceleration/

Torque and Angular Acceleration | Boundless Physics
https://courses.lumenlearning.com/boundless-physics/chapter/torque-and-angular-acceleration/
When a torque is applied to an object it begins to rotate with an acceleration inversely proportional to its moment of inertia. This relation can be thought of as Newton’s Second Law for rotation. The moment of inertia is the rotational mass and the torque is rotational force. Angular motion obeys Newton’s First Law.

https://www.softschools.com/formulas/physics/angular_acceleration_formula/153/

Angular Acceleration Formula – Softschools.com
https://www.softschools.com/formulas/physics/angular_acceleration_formula/153/
The average angular acceleration is the change in the angular velocity, divided by the change in time. The angular acceleration is a vector that points in a direction along the rotation axis. The magnitude of the angular acceleration is given by the formula below. The unit of angular acceleration is radians/s 2.

https://physics.stackexchange.com/questions/515668/rotational-mechanics-is-angular-acceleration-possible-without-any-external-torq

Rotational Mechanics: Is Angular Acceleration Possible …
https://physics.stackexchange.com/questions/515668/rotational-mechanics-is-angular-acceleration-possible-without-any-external-torq
Translational Acceleration in an object cannot come without any external force, but the angular acceleration in an object may come without any external torque. External torque is NOT the only source of angular acceleration. Angular acceleration in a rotating body may come even when the moment of inertia of the body is changing.

https://www.physicskey.com/20/angular-position-velocity-and-acceleration

Angular Position, Velocity and Acceleration – Physics Key
https://www.physicskey.com/20/angular-position-velocity-and-acceleration
The angular acceleration is denoted by $alpha$. Remember that if we simply say angular acceleration, we mean instantaneous angular acceleration not average angular acceleration. You can find the direction of angular velocity by the right hand thumb rule but to find the direction of angular acceleration you can not use it- of course you can use …

https://www.wikihow.com/Calculate-Angular-Acceleration

3 Ways to Calculate Angular Acceleration – wikiHow
https://www.wikihow.com/Calculate-Angular-Acceleration
When the object is moving in a circle, such as a spinning tire or a rotating CD, velocity and acceleration are generally measured by the angle of rotation. They are then called angular velocity and angular acceleration. If you know the object’s velocity over some period of time, you can calculate its average angular acceleration.

https://quizlet.com/55781218/biomechanics-ch11-flash-cards/

Biomechanics ch11 Flashcards | Quizlet
https://quizlet.com/55781218/biomechanics-ch11-flash-cards/
If angular acceleration is constant, which of the following is true of angular velocity? A. it must be constant B. it must be equal to zero C. it must be increasing D. none of the above. … D. there are no special rules. A and B A. units for ω have to be radian-based