noun (n)

• a force that moves something along(noun.phenomenon)

  Synonym:
  drift, impulsion
  

  source: wordnet30
• the act of applying force suddenly(noun.act)

  Synonym:
  impulse, impulsion
  

  source: wordnet30
• A property possessed by a moving body in virtue of its weight and its motion; the force with which any body is driven or impelled; momentum.(noun)

  source: webster1913