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The angular momentum vector of a particle about a point on the rotational axis is parallel to its angular velocity vector, provided the particle rotates with fixed speed about that axis. True or False?

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in Physics – Class 11 by (74.2k points)
The angular momentum vector of a particle about a point on the rotational axis is parallel to its angular velocity vector, provided the particle rotates with fixed speed about that axis. True or False?

(a) True

(b) False

The question was asked in a job interview.

My question comes from Angular Momentum in case of Rotations about a Fixed Axis topic in portion System of Particles and Rotational Motion of Physics – Class 11

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The correct option is (b) False

To explain: The diagram below shows that the angular momentum of the particle is not along the direction of angular velocity when calculated about point A. Both the vectors are parallel when the angular momentum is calculated about point O.

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