Understanding Kinetic Friction: Solving Problems in 3D Physics Simulations

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Discussion Overview

The discussion revolves around the implementation of kinetic friction in a 3D physics simulation, specifically addressing the equations and concepts necessary for realistic modeling. Participants explore the differences between static and kinetic friction, as well as the potential influence of velocity on frictional forces.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant seeks to understand the appropriate equations for kinetic friction in a dynamic context, noting the basic static friction equation F=uN.
  • Another participant states that in the standard model for dry friction, kinetic friction is represented by \mu_k N and is typically considered independent of velocity.
  • A participant questions the accuracy of the professor's claim regarding velocity and friction, suggesting that it simplifies coding.
  • There is a suggestion to consult a freshman physics book for foundational knowledge on kinetic friction.
  • One participant expresses reluctance to return to school resources, indicating a preference for online information despite its limitations.

Areas of Agreement / Disagreement

Participants express differing views on the professor's statement about the relationship between velocity and kinetic friction. While some uphold the standard model of kinetic friction as independent of velocity, others question this perspective, leading to an unresolved debate.

Contextual Notes

There is a lack of consensus on the applicability of velocity in the context of kinetic friction, and the discussion does not resolve the assumptions underlying the professor's claim or the standard model.

Brainv2.1beta
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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.)
 
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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.
 
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:
Brainv2.1beta said:
So your saying that professor I mentioned was incorrect?
Why don't you ask the professor what he meant?
 
Doc Al said:
Why don't you ask the professor what he meant?

Can't, I talked with him last at a science convention overseas.
 
Then pick up any freshman physics book and read what it says about kinetic friction.
 
Doc Al said:
Then pick up any freshman physics book and read what it says about kinetic friction.

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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