momentum : Idioms & Phrases

noun 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

noun the principle that the total linear momentum in a closed system is constant and is not affected by processes occurring inside the system

(Mech.), a parallelogram the diagonal of which represents the resultant of two velocities, forces, accelerations, momenta, etc., both in quantity and direction, when the velocities, forces, accelerations, momenta, etc., are represented in quantity and direction by the two adjacent sides of the parallelogram.