The angular momentum
of a system which is in rotation around a certain rotation axis,
is a vector
which is parallel to the rotation axis
and which points in the positive
or negative direction
depending on whether the rotation
is anticlockwise
or clockwise.
When no torque acts on the rotating system,
then not only the magnitude,
but also the orientation
of the angular momentum vector
is conserved.
The next videos will show that phenomenon.
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