momentum

US /məˈmen.t̬əm/
UK /məˈmen.t̬əm/
"momentum" picture
1.

the quantity of motion of a moving body, measured as a product of its mass and velocity

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The car gained momentum as it rolled down the hill.
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The ball's momentum carried it into the net.
:
impetuspropulsiondrivethrustforce
2.

the impetus and driving force gained by the development of a process or course of events

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The campaign is gaining momentum.
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We need to build on this positive momentum.
:
impetusdrivethrustforcepower