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!

Hockey Puck (Momentum)

  1. Oct 7, 2008 #1
    Hello,

    Q.) A hockey puck moving at 0.48 m/s collides elastically with another puck that was at rest. The pucks have equal mass. The first puck is deflected 39° to the right and moves off at 0.35 m/s. Find the speed and direction of the second puck after the collision. Make sure the speed is in m/s and direction in terms of degrees

    A.) The way i tried solving this problem is below:

    m1=m2

    Hockey Puck #1:
    p=p(final)-p(initial)
    =m1(vfinal-vinitial)


    Hockey Puck #2:
    =m2(vfinal-vinitial)


    p1=p2

    m1(v1final-v1initial)=m2(v2final-v2initial)

    Both the masses cancel out..... we have the following:
    v1initial=.48
    v1final= .35cos39
    v2initial=0

    Plug in formula and get v2final=-.21 since it's going to the left....but this answer is wrong.

    I tried 39° for the second puck since they both weight the same but this is wrong as well.


    Please i don't know why i'm getting this wrong. Any help will be appeciated :smile:
     
  2. jcsd
  3. Oct 8, 2008 #2
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Hockey Puck (Momentum)
  1. Hockey Puck (Replies: 5)

  2. Hockey pucks (Replies: 1)

Loading...