impetus

Noun
  1. A force that moves something along (synset 111467947)
    is a type of: force - (physics) the influence that produces a change in a physical quantity
    same as: drift, impulsion
  2. The act of applying force suddenly (synset 100105069)
    "the impulse knocked him over"
    is a type of: drive, driving force, thrust - the act of applying force to propel something
    same as: impulse, impulsion

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