# Angular vel. and mom.-origins vs. axes

1. Mar 15, 2012

### TomServo

Angular vel. and mom.--origins vs. axes

This is a conceptual question.

Angular velocity is measured with respect to an axis, correct?

Yet angular momentum is measured with respect to an origin, i.e. a point, correct?

For angular momentum problems where only the magnitude of angular momentum changes, it seemed like we were calculating L with respect to an axis, but that was not correct, strictly speaking, right?

2. Mar 15, 2012

### tiny-tim

Hi TomServo!
Angular velocity and angular momentum are both vectors (strictly, psuedovectors)

Angular momentum is measured wrt a point

Angular velocity isn't
Right! In that case, we are assuming (correctly) that the angular momentum lies along that axis, without bothering to say so!