Conservative Forces: Friction a Non-Conservative Force?

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Discussion Overview

The discussion revolves around the classification of friction as a non-conservative force, exploring the underlying reasons and implications of this classification. Participants examine the relationship between atomic interactions and macroscopic friction, as well as the role of statistical mechanics in understanding these forces.

Discussion Character

  • Debate/contested

Main Points Raised

  • One participant questions why friction is considered a non-conservative force, suggesting it arises from conservative electric interactions.
  • Another participant agrees that friction is due to electromagnetic interactions but argues that the macroscopic treatment of friction through statistical approximation leads to its non-conservative nature.
  • A participant challenges the idea that statistics can alter the fundamental nature of a force.
  • It is proposed that friction is non-conservative because it is not fully accounted for in classical mechanics, despite models like the coefficient of friction being useful.
  • One participant asserts that the distinction between conservative and non-conservative forces is fundamentally linked to energy dissipation into heat and random thermal motion, indicating that energy is conserved but distributed across many degrees of freedom.

Areas of Agreement / Disagreement

Participants express differing views on the classification of friction and the role of statistical mechanics, indicating that the discussion remains unresolved with multiple competing perspectives.

Contextual Notes

The discussion highlights limitations in the treatment of friction, particularly regarding the assumptions made in macroscopic models and the complexity of atomic interactions.

SandeshPhy
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Why is friction a non-conservative force ?
It arises to Electric interactions which is a conservative force(field).
 
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Yes, friction is due to electromagnetic interactions at the atomic level, which are conservative. However, it is difficult, if not impossible to consider the individual interactions of the atoms. Hence the concept of "friction" on a macroscopic level based on statistical approximation. It is this treatment that causes frictional force to be nonconservative.
 
But even then how can statistics change the nature of force,how can it change something that is the way of working of force.
 
It is simply nonconservative due to the fact that it is not accounted for - in all. We know that the coefficient of friction concept models the reality of this force decently, but in consequence, it is nonconservative.
 
how can statistics change the nature of force
Statistics exactly IS the difference between conservative and nonconservative. A nonconservative force by definition is one that degenerates energy into heat, i.e. random thermal motion. Energy is conserved, but it becomes distributed over a great many degrees of freedom.
 

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