What term describes the change in angular velocity over a period of time?

The change in angular velocity over a period of time is best described by the term "angular acceleration." Angular acceleration quantifies how quickly an object's angular velocity is changing. It can be calculated as the difference in angular velocity divided by the time interval during which this change occurs. This concept is crucial in rotational motion, similar to how linear acceleration describes changes in linear velocity for objects in translational motion. Angular acceleration can be expressed in units such as radians per second squared (rad/s²), indicating the rate at which the rotational speed of an object increases or decreases over time. This makes it an important factor in dynamics involving rotational forces and motions.