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Changing velocity

  1. Jan 26, 2008 #1
    I'm curious as to how a vehicle might change velocity or direction in space? Do virtual particles act as a medium by which an engine can achieve this? Or does an engine not need a medium and why?
  2. jcsd
  3. Jan 26, 2008 #2


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    conseravaton of momentum.

    If a space man is moving away from his space ship, he can throw a thing in the direction he is moving and he will then move back towards the space ship due to conseravation of linear momenta.
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