Angular momentum

quantity that is the measure of the intensity of rotational motion (Physics)

In physics, the angular momentum of an object rotating about some reference point is the measure of the extent to which the object will continue to rotate about that point unless acted upon by an external torque. In particular, if a point mass rotates about an axis, then the angular momentum with respect to a point on the axis is related to the mass of the object, the velocity and the distance of the mass to the axis. While the motion associated with linear momentum has no absolute frame of reference, the rotation associated with angular momentum is sometimes spoken of as being measured relative to the fixed stars.
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Noun
1. the product of the momentum of a rotating body and its distance from the axis of rotation; "any rotating body has an angular momentum about its center of mass"; "angular momentum makes the world go round"
(hypernym) momentum

A quantity obtained by multiplying the mass of an orbiting body by its velocity and the radius of its orbit. According to the conservation laws of physics, the angular momentum of any orbiting body must remain constant at all points in the orbit, i.e. it cannot be created or destroyed. If the orbit is elliptical the radius will vary. Since the mass is constant the velocity changes. Thus planets in elliptical orbits travel faster at periastron and more slowly at apastron. See also orbital angular momentum, spin and Kepler's Laws of Motion. A spinning body also possesses spin angular momentum.

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