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angular momentum

the momentum characteristic of a rotating object; the product of linear momentum and the perpendicular distance from the origin of coordinates to the path of the object: the conservation of angular momentum causes a spinning skater, star, etc. to increase (or decrease) in velocity as the radius is reduced (or increased): symbol, Ω

See angular momentum in American Heritage Dictionary 4

noun
  1. The vector product of the position vector (from a reference point) and the linear momentum of a particle.
  2. The vector sum of the angular momentums of each infinitesimal component particle of an extended body.

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