The angular velocity vector ω
is a vector that represents
the angular speed of the particle
and the sense of rotation of the particle.
The angular velocity vector ω
is perpendicular to the plane of rotation
and points upward
for counterclockwise rotation,
downward
for clockwise rotation.
Its modulus equals the angular speed ω:
|ω| = ω
The angular velocity vector ω
can be represented by a vector product
(or cross product).
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