Angular momentum
(from Rotational Mechanics chapter)
Angular momentum of a particle about a point O is defined as
l = r×p
l, r, and p are vectors.
l = angular momentum of a particle
r = positition vector of the particle from O
p = linear momentum of the particle
Angular momentum of a particle about a line say AB is the component of angular momentum about a point O on the line AB along the line AB. It means to find angular momentum of a particle about a line AB, we have to first find angular momentum about a point O on AB and then find its component along the line AB.
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