force or speed of movement; impetus, as of a physical object or course of events

The car gained momentum going downhill. Her career lost momentum after two unsuccessful films.

Also called linear momentum. Mechanics . a quantity expressing the motion of a body or system, equal to the product of the mass of a body and its velocity, and for a system equal to the vector sum of the products of mass and velocity of each particle in the system.

Philosophy . moment ( def. 7 ) .

noun

drive , energy , force , impulse , power , propulsion , strength , thrust , impetus , moment , motion , tide , velocity