1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Help with momentum physics problem

Tags:
  1. Jul 3, 2016 #1
    Ball A, which weighs 2 kilograms, is moving at 0.5 meters/second and strikes stationary Ball B at the direct center of the ball.
    Ball B, which weighs 3 kilograms, moves off at 0.3 meters/second and in the same original direction Ball A was moving. Ball A continues to move forward, but only at 0.1 meters/second. Is momentum conserved? Explain.


    I don't even know where to start, or what to do so could I have some help with this?
     
  2. jcsd
  3. Jul 3, 2016 #2
    The momentum of the system is conserved if it's the same before the strike and after...
    What's the momentum before?
    What about after?
     
  4. Jul 4, 2016 #3
    The system consists of two bodies: ball A and ball B
    All the movements are performed along one axis: OX. Let the positive direction coincide with the direction of ball A movement.
    Then, the momentum before the strike
    P1 = mAvA + mBvB
    vA = 0.5 m/s, vB = 0
    The momentum after strike
    P2 = mAuA + mBuB
    uA = 0.1 m/s, uB = 0.3 m/s

    So, the conclusion is clear but still up to you)
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook