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Help needed force on objects

  1. Sep 10, 2009 #1
    I have been racking my brains for 2 days.

    I am working on a homebrew video game and am having problems with the physics.

    say i have 3 objects, one moving left to right(1) the other 2 moving right to left(2,3).

    they all have the same mass and velocity.

    Say the mass is 100 units and the velocity is 1 unit.

    So far i have been able to get the code to work where if object1 collides with object2 then they both stop moving. What I want to happen is if object3 collides with the back of object2 that it will transfer it's force to both objects and I will get movement in all 3 in the right to left direction.

    Friction is zero, not a factor in this.

    I think what I am mostly stuck on now is how to calculate the velocity of the group of objects when that 3rd one starts pushing.

    Thanks

    EDIT

    forgot to mention, right now i am only dealing in a 2d plane with the forces only being applied in the X axis.
     
    Last edited: Sep 10, 2009
  2. jcsd
  3. Sep 10, 2009 #2

    berkeman

    User Avatar

    Staff: Mentor

    Welcome to the PF. Sounds like you are modelling elastic collisions. Think "conservation of linear momentum"

    http://en.wikipedia.org/wiki/Momentum#Elastic_collisions

    Why would two objects stop moving if they collide? Wouldn't they bounce back apart?
     
  4. Sep 10, 2009 #3
    No i am thinking more bulldozer type collisions, it hits the other object and starts moving it if it can, no bounce. I am not going for realism at all here.
     
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