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Homework Help: Momentum Problem on a glider

  1. Nov 3, 2009 #1
    1. The problem statement, all variables and given/known data
    Gliders C and D, of masses 2kg and 4kg, respectively, collide on a frictionless track. Glider C initially moves to the right with a speed of .6 m/s relative to the track, while glider D is at rest. After the collision, glider C moves to the left with a speed of .2 m/s. System S consists of gliders C and D.

    2. Relevant equations
    What is the magnitudes and directions of the momentum vectors for glider C, glider D, and system S before and after the collision?

    Is the momentum of system S before the collision the same as it is after the collision? Explain.

    3. The attempt at a solution
    I was able to find the momentum of glider C before and after the collision using p=mv. I also knew glider D would not have a momentum vector before the collision because it is at rest.

    I could not find the momentum of glider D after the collision or the momentum vectors of system S.
  2. jcsd
  3. Nov 4, 2009 #2


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    Staff Emeritus
    Science Advisor
    Gold Member

    You know momwntum is a conserved quantity. Therefore the momentum before should equal the momentum afterwards.
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