momentum

liikemäärä

liikevoima puhekieltä (of a body in motion) The tendency of a body to maintain its inertial motion; the product of its mass and velocity.
The impetus, either of a body in motion, or of an idea or course of events. (i.e: a moment)
1843, Nathaniel Hawthorne, "The Old Apple Dealer", in Mosses from an Old Manse

The travellers swarm forth from the cars. All are full of the momentum which they have caught from their mode of conveyance.

Their intention to become husband and wife, at first halting and timorous, had accumulated momentum with the lapse of hours, till it now bore down every obstacle in its course.