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  • Choose the correct alternatives: (a) For a general rotational motion, angular momentum L and angular velocity \omega need not be parallel. (b) For a rotational motion about a fixed axis, angular momentum L and angular velocity \omega are always parallel.

Choose the correct alternatives:
(a) For a general rotational motion, angular momentum L and angular velocity \omega need not be parallel.
(b) For a rotational motion about a fixed axis, angular momentum L and angular velocity \omega are always parallel.
(c) For a general translational motion , momentum p and velocity v are always parallel.
(d) For a general translational motion, acceleration a and velocity v are always parallel.

Answers (1)

The correct answer is the option (a) and (c).

For general translation motion p=mv, where m is a scalar quantity. So, the direction of p is the same as that of v. Hence; they are always parallel.

In case of general rotation motion L=mr^{2}\omega where the axis of rotation is not symmetric, L is not parallel to the angular velocity.

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