Which material combination has the highest coefficient of kinetic friction?

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    Coefficients Friction
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Discussion Overview

The discussion revolves around identifying which material combination—steel on polyethylene, rubber on polyethylene, or polyethylene on polyethylene—exhibits the highest coefficient of kinetic friction. The scope includes theoretical considerations and practical implications in engineering contexts.

Discussion Character

  • Debate/contested

Main Points Raised

  • One participant suggests that rubber on polyethylene may have the highest coefficient of kinetic friction, although they express uncertainty about this claim.
  • Another participant introduces the idea that the coefficient of friction is merely a model, implying that real-world measurements can differ significantly from theoretical values.
  • A third participant reiterates that the coefficient of friction is a model and emphasizes the variability of actual friction forces compared to calculated values.
  • One participant humorously suggests that the coefficient of friction could be infinite in cases of complete classical adhesion.

Areas of Agreement / Disagreement

Participants do not reach a consensus on which material combination has the highest coefficient of kinetic friction, and multiple competing views remain regarding the nature and applicability of the coefficient of friction.

Contextual Notes

There are limitations related to the assumptions underlying the coefficient of friction, as well as the dependence on specific definitions and conditions of the materials involved. The discussion does not resolve these complexities.

Surya97
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What has the highest coefficient of kinetic friction, steel on polyethylene, rubber on polyethylene, or polyethylene on polyethylene?
 
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That would be infinity ... ie. complete classical adhesion.
The "coefficiant of friction" is just a model.
 
Simon Bridge said:
The "coefficient of friction" is just a model.

Commonly known as the ' coefficient of fiction ' in engineering .

Actual friction forces as measured for real sliding surfaces are often far different from calculated values .
 

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