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Homework Help: 2D pool Ball collision

  1. Jan 19, 2010 #1
    I have two balls with d1 and d2 as their direction, and I have the speed s1 and s2, d1 and d2 are in radians showing the angle made with positive direction of x axis and in anticlockwise direction i.e 0<=d1 and d2<2*pi
    their positions are (x1,y1) and (x2,y2) when they collided

    after collosion
    what would be their speed, and direction?
  2. jcsd
  3. Jan 19, 2010 #2


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    Last edited: Jan 19, 2010
  4. Jan 19, 2010 #3
    shouldn't their positions be the same when they collide?

    basically you want to split the problem up into two problems: momentum is conserved in both the x and y directions, independently. also it looks like you're assuming completely elastic collisions.
  5. Jan 19, 2010 #4
    Sorry--you will need to use conservation of energy, too.
    this plus both equations for conservations of momentum should be enough to solve the problem.
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