More Angular Momentum, then
Statics
Physics 1425 Lecture 23
Michael Fowler, UVa

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Vector Angular Momentum of a Particle
•
A particle with momentum
is at
position
from the origin O.
•
Its angular momentum about the
origin is
•
This is in line with our definition
for part of a rigid body rotating
about an axis:
but also works for
a particle flying through space
.
p
r
L
r
p
=
×
Viewing the
x
-axis as
coming out of the slide, this
is a “right-handed” set of
axes:
ˆ
ˆ
ˆ
i
j
k
×
=+
p
r
L
r
p
=
×
O
x
z
y
m

Clicker Question
•
A particle moves along a straight line at
constant speed.
The line does not pass
through the origin.
Is the particle’s angular
momentum about the origin constant?
A.
Yes
B.
No

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