The angle in radians through which an object rotates around an axis.

The rate at which angular position changes with time.

The rate at which angular velocity changes with time.

Radians per second (rad/s).

Radians per second squared (rad/s²).

$$\omega_{avg} = \frac{\Delta \theta}{\Delta t}$$ where $\omega_{avg}$ = average angular velocity, $\Delta \theta$ = change in angular displacement and $\Delta t$ = change in time.

$$\alpha_{avg} = \frac{\Delta \omega}{\Delta t}$$ where $\alpha_{avg}$ = average angular acceleration, $\Delta \omega$ = change in angular velocity and $\Delta t$ = change in time.

$$\theta = \theta_0 + \omega_0 t + \frac{1}{2} \alpha t^2$$ where $\theta$ = angular displacement at time $t$, $\theta_0$ = initial angular displacement, $\omega_0$ = initial angular velocity and $\alpha$ = angular acceleration.

$$\omega^2 = \omega_0^2 + 2\alpha(\theta - \theta_0)$$ where $\omega$ = angular velocity at angular displacement $\theta$, $\omega_0$ = initial angular velocity, $\alpha$ = angular acceleration and $\theta_0$ = initial angular displacement.

The disk experiences angular deceleration and eventually comes to rest.

The object's angular velocity increases linearly with time.

The moment of inertia increases.

For a given time interval, the angular displacement increases.

The angular velocity remains constant.