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Kinetic friction problems

  1. Mar 10, 2008 #1
    I am trying to create a 3d physics simulation and the first "problem" I have encountered is implementing realistic friction. Now, I was told by some professor that the faster an object is traveling the less friction that it has, however, I have not been able to find the appropriate equation/s on the net. I know the basic friction equation, F=uN. However, this is only useful for static applications; I need to learn the formula for kinetic friction, and how to apply it to non-static variables (eg. speed-=frictionequation.)
     
  2. jcsd
  3. Mar 10, 2008 #2

    Doc Al

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    In the usual ("standard" or Coulomb) model for dry friction between surfaces, kinetic friction is given by [itex]\mu_k N[/itex] and is independent of velocity. When you start adding in air resistance you'll quickly get speed-dependent forces.
     
  4. Mar 10, 2008 #3
    So your saying that professor I mentioned was incorrect? At least this makes coding easier.

    By the way, I am making rolling sphere physics.
     
    Last edited: Mar 10, 2008
  5. Mar 10, 2008 #4

    Doc Al

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    Why don't you ask the professor what he meant?
     
  6. Mar 10, 2008 #5
    Can't, I talked with him last at a science convention overseas.
     
  7. Mar 10, 2008 #6

    Doc Al

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    Then pick up any freshman physics book and read what it says about kinetic friction.
     
  8. Mar 10, 2008 #7
    Yeah yeah I'm not in school anymore though and the library's a long walk...google doesn't really count...
     
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