1. Limited time only! Sign up for a free 30min personal 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!

Collisions of hockey pucks

  1. Jan 2, 2005 #1
    Okay, here's the problem I'm working on...
    A .50 kg hockey puck moving at a speed of 5.70 m/s collides with a stationary hockey puck of equal mass. After the collisions, the first puck moves off in a direction 60 degrees to the left of its original direction, while the second puck moves off at a right angle to the first puck. What is the speed of the second puck after the collision?
    I know that I have to solve for the components, but I'm not sure which numbers to use to solve for it.
  2. jcsd
  3. Jan 2, 2005 #2


    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    mmh... These are the "numbers":

    initial horizontal momentum = (0.50 kg)(5.70)

    initial vertical momentum = 0.
  4. Jan 2, 2005 #3


    User Avatar
    Science Advisor
    Homework Helper

    1)Make a diagram of the particles which collide in which put the momentum vectors.Be careful with the angles.
    2)Chose a coordinate system with the center in the collision point and 2 orthonorlmal axis.
    3)Write down the conservation of momentum in vector form and conservation of KE.
    4) Project the vector eq.written at 3) on the axis of coordinates.
    5)Find the "speed of the second puck after the collision".Actually from 4) u find its components on the 2 axis of coordinates.Apply Pythagora's theorem to find the modulus.

Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Threads - Collisions hockey pucks Date
Elastic collision of hockey puck Mar 31, 2010
Hockey puck momentum/ collision Nov 30, 2009
Hockey Puck Collision Feb 12, 2009
Collision with ice hockey puck Aug 24, 2008