Write the change in magnitude and direction of angular velocity with respect to time for a body rotating about a fixed axis.

(N/A) For a body rotating about a fixed axis,the angular velocity vector $\vec{\omega}$ is directed along the axis of rotation.
$1$. Magnitude: The magnitude of angular velocity,$\omega$,changes with time if the body undergoes angular acceleration $(\alpha = d\omega/dt \neq 0)$. If the rotation is uniform,the magnitude remains constant.
$2$. Direction: Since the axis of rotation is fixed,the direction of the angular velocity vector $\vec{\omega}$ remains constant (it always points along the fixed axis of rotation,determined by the right-hand rule).