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!

Elastic Collision

  1. May 5, 2009 #1
    1. The problem statement, all variables and given/known data
    The problem is in the picture(attached)


    2. Relevant equations
    I know we have to use
    m1v1 + m2v2 = m1v1' + m2v2'
    (1/2)m1v1^2 + (1/2)m2v2^2 = (1/2)m1v1'^2 + (1/2)m2v2'^2

    3. The attempt at a solution
    All I know is that it needs to be split up into components.
    Please help me out.
     

    Attached Files:

    • ps.jpg
      ps.jpg
      File size:
      35.1 KB
      Views:
      53
  2. jcsd
  3. May 6, 2009 #2

    tiny-tim

    User Avatar
    Science Advisor
    Homework Helper

    Welcome to PF!

    Welcome to PF! :smile:

    (please type the question in future … it's much easier to read than having to look at a picture in a separate window)

    (and try using the X2 and X2 tags just above the Reply box :wink:)

    Yes, the first equation is a vector equations, and needs to be split up into two scalar equations.

    (You could choose West and North for the component directions, for example.)

    So … show us what you get. :smile:
     
  4. May 6, 2009 #3
    Health Warning::smile:

    This problem can get very messy unless you translate it into
    the reference frame in which the c of m is stationary.

    David
     
  5. May 6, 2009 #4

    tiny-tim

    User Avatar
    Science Advisor
    Homework Helper

    No, you should be able to do it in the reference frame given.
     
  6. May 6, 2009 #5
    Thanks guys, and yes I will try this question out. I got some help today from a friend, he said that there was no need for NS/EW components. He told me to make a triangle. So therefore the resulting velocity after the collision of the 2amu mass would be v1'cos10.

    2(2km/s) + 1(0m/s) = 2(v1'cos10) + v2'
    4 - 2v1'cos10 = v2' (this will be equation one)

    We know kinetic energy is conserved:
    2(2km/s)2 + 1(0m/s)2 = 2(v1'cos10)2 + v2'2
    8 - 2(v1'cos10)2 = v2'2 (our second equation)

    Then sub in equations into each other for v2'.
    I have to go for now but I will get back to you guys soon on the problem. Please keep in mind that im only in grade 12:confused:. Thanks again.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Elastic Collision
  1. Elastic Collisions? (Replies: 3)

  2. Elastic Collisions (Replies: 5)

  3. Elastic collision (Replies: 6)

Loading...