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Homework Help: Momentum Conservation and Collisions Concept?

  1. Mar 8, 2010 #1
    1. The problem statement, all variables and given/known data
    A 100 kg man and a 90 kg man are rounding a corner and collide. The heavier man is running, while the 90 kg man is walking. What happens to the momentum of the 100 kg man? Does it increase, decrease, stay the same, or "is conserved"?

    2. Relevant equations
    Change in momentum = MV(final) -- MV(initial)

    3. The attempt at a solution
    Out of the multiple choice answers, I would think that his momentum would decrease because his velocity is decreasing, but I know that in such elastic collisions, momentum is ALWAYS conserved. This is why I'm confused. Any explanation would be greatly appreciated! :)
  2. jcsd
  3. Mar 8, 2010 #2


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    The total momentum is conserved. All the individual momenta are, generally, not or collisions wouldn't change anything!
  4. Mar 8, 2010 #3
    Thank you very much!!
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