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Collision of two pool balls

  1. Jan 17, 2008 #1
    I have a bit of time on my hands at the moment and being an avid pool fan I wanted to try my hand at programming a pool simulation. Now I have the balls moving correctly whether they are sliding or rolling but I am having a little trouble getting my head round the collisions.

    Ideally I want the collisions to be modelled taking into account the friction between balls and therefore use the conservation of angular momentum as well as the conservation of linear momentum. I have tried looking up everything I can on the subject but I can't seem to work out how to model it. Everywhere seems to talk about the collision force acting between the two balls but I can't seem to work out how I get this force. I realise that in reality this force happens over a period of time but for the sake of simplicity I wanted to program the collisions to be instantaneous. So what I am asking basically is how do I find out the force acting between these two balls? As it's a programming problem I ideally want this in terms of information that I can use, such as the balls linear and angular velocity. Hope that makes sense.
     
  2. jcsd
  3. Jan 17, 2008 #2

    Shooting Star

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    Before I try to give an answer to your main query, how are you slowing down the balls? Have you been able to give spins to the balls?
     
  4. Jan 17, 2008 #3
    Yeah, the motion of the balls is working fine with both linear and angular velocities. It calculates the change in position from it's previous state change (i.e. when a force is applied to it or when it changes from sliding to natural roll) as time elapses.
     
  5. Jan 18, 2008 #4

    Shooting Star

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    Have a look at this. You may find it helpful.
     
    Last edited: Jan 18, 2008
  6. Jan 18, 2008 #5
    Yes I have read that but unfortunately it does not deal with ball - ball friction.
     
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