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What impulse must act on the bowling ball to stop it?

  1. Feb 5, 2016 #1
    1. The problem statement, all variables and given/known data

    A 10kg bowling ball is moving with a velocity of -3m/s.
    a) What is the momentum of the bowling ball?
    b) What impulse must act on the bowling ball to bring it to a stop?

    2. Relevant equations

    momentum=mv
    impulse=ΣFΔt
    ΣFΔt=mΔv

    3. The attempt at a solution

    a) momentum = mv
    momentum = (10)(-3)
    momentum = -30Ns

    b) This is where I get stuck. Is the impulse simply equal and opposite to the momentum? Or is there another step?

    ΣFΔt=mΔv
    ΣFΔt=-30Ns
    ΣFΔt=30Ns (opposite sign because bowling ball has to be stopped by a force going in the other direction)
     
  2. jcsd
  3. Feb 5, 2016 #2

    gneill

    User Avatar

    Staff: Mentor

    Impulse represents a change in momentum. The change you want in this case happens to be equal in magnitude to the initial momentum of the bowling ball. So you've done fine.
     
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