Question

The direction of which of the following vectors is along the line of axis of rotation?

• A. Angular velocity, angular acceleration only
• B. Angular velocity, angular momenturm only
• C. Angular velocity, angular acceleration, angular momentum only
• D. Angular velocity, angular acceleration, angular momentum and torque

Answer 1

Answer: (D)

Angular velocity, angular acceleration, angular momentum and torque

angular velocity $=\omega$
angular momentum $=I\omega$
angular acceleration $=\alpha =\frac{d\omega }{dt}$
Torque $=I\alpha$
$=I\frac{d\omega }{dt}$
Since direction of the angular velocity is along
the axis of rotation.
$\therefore$ the direction of L, $\alpha$ , T will also
be in the direction of axis of Rotation as all
of than has the same direction, which the direction
of the angular velocity.