Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Solving Collisions with angles problem

  1. Jun 26, 2011 #1
    First off, i'd like to note that this isn't homework, and i've seen other threads in here that deal with question/equation/problems, so I hope this isn't against the rules. I found this on a practice physics test online. I'm just using it for the benefit of my knowledge, nothing more.

    I can provide the link if necessary for proof.

    Heres the question I want to know how to solve:
    [PLAIN]http://k.min.us/ibDXoi.jpg [Broken]
     
    Last edited by a moderator: May 5, 2017
  2. jcsd
  3. Jun 26, 2011 #2

    tiny-tim

    User Avatar
    Science Advisor
    Homework Helper

    Last edited by a moderator: Apr 26, 2017
  4. Jun 26, 2011 #3
    ohhh... I think you put me on the right track for beginning to solve this. The initial momentum was
    in this case. Therefore the conservation of momentum is seen for that X component, I'll have to split them off into the X and Y components of momentum and look specifically at the X/horizontal component of momentum to use the conservation of momentum, if i'm not mistaken?

    4.85 Cos(36o) = 3.92m/s

    p = mv
    p = (0.200kg)(3.92m/s)
    p = 1.2kg•m/s

    Solve for momentum of that object.

    p = mv
    p = (0.200kg)(3.92m/s)
    p = 0.784kg•m/s

    Momentum of the other object (puck 2) is: 1.2kg•m/s - 0.784kg•m/s

    = 0.416kg•m/s [Important: in the x/horizontal direction. need to solve for the angle'd direction]

    0.416kg•m/s ÷ [cos(54o)] =

    0.707741472...kg•m/s !!!!

    I think with "their" answer, they rounded a bit too early.​
     
    Last edited: Jun 26, 2011
  5. Jun 26, 2011 #4

    tiny-tim

    User Avatar
    Science Advisor
    Homework Helper

    Hi AceInfinity! :smile:
    yes that's fine :smile:

    but there are quicker ways of doing it …

    you could take components in the y direction or in the final direction of puck 2 …

    (both are quicker because they reduce the number of terms)

    try both of those :wink:
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Solving Collisions with angles problem
  1. Collision Problem (Replies: 1)

Loading...