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Homework Help: Analysis of collisions from data

  1. Feb 12, 2017 #1
    Good afternoon! I would like to preface by saying, yes, this is for a project. I am only posting here to see if my method of solving is correct before I finish the project incorrectly.
    1. The problem statement, all variables and given/known data
    I chose two balls, mass A: .553 kg and mass B: .410 kg
    I recorded their collision and plotted the points on Tracker: http://physlets.org/tracker/
    Through the analysis of the horizontal component of mass A (before the collision), I have determined the speed is 1.72m/s. On the horizontal component of mass B (before the collision), the speed is -3.704m/s. I have to find the momentum (kg m/s) and kinetic energy (J) of each collision and of the total system. Is my attempt correct? If not, can someone point me in the right direction?

    2. Relevant equations
    momentum: p = m*v
    kinetic energy: 1/2mv2

    3. The attempt at a solution
    mass A momentum: (.553)(1.72) = 0.9511 kg m/s
    mass A kinetic energy: 1/2(.553)(1.722) = 0.8179 J

    mass B momentum: (.410)(-3.704) = -1.5186 kg m/s
    mass B kinetic energy: 1/2(.410)(-3.7042) = 2.8125 J

    For the total system I just added the values.
    momentum: .9511 + -1.5186 = -.569
    kinetic energy: .8179 J + 2.8125 J = 3.6304 J
  2. jcsd
  3. Feb 12, 2017 #2


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    Staff: Mentor

    That is fine so far.
  4. Feb 12, 2017 #3
    Awesome! Thanks for the help!
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