Friction: Force & Electromagnetic Nature

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Discussion Overview

The discussion revolves around the nature of friction as a force, particularly whether it is electromagnetic in nature and how it operates at different levels of analysis. Participants explore theoretical aspects of friction, its underlying mechanisms, and specific examples of its behavior in various contexts.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification, Debate/contested

Main Points Raised

  • Some participants suggest that friction arises from electromagnetic interactions between atoms at the surfaces of two objects.
  • Others propose that the understanding of friction can vary depending on the level of analysis, with macro-level interactions involving surface projections and micro-level interactions involving electric fields of protons and neutrons.
  • A participant mentions that friction can occur even with zero or negative normal force, citing adhesive tape as an example, and discusses how adding water can sometimes increase friction contrary to typical expectations.

Areas of Agreement / Disagreement

Participants express differing views on the nature of friction and its underlying mechanisms, indicating that multiple competing perspectives remain without a clear consensus.

Contextual Notes

Some claims depend on specific definitions of friction and the contexts in which it is analyzed, which may not be fully resolved in the discussion.

manimaran1605
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What kind of force is Friction, force applied on a particle? Are these are Electromagnetic in nature?
 
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manimaran1605 said:
What kind of force is Friction, force applied on a particle? Are these are Electromagnetic in nature?

Friction doesn't apply to a particle.
But in general, yes, frictional forces ariss from electromagnetic interactions between the atoms at the surface of the two objects.
 
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It really depends upon which "level" you are looking at. From the "macro" level, friction is small projections in the surface hitting and perhaps breaking off against small projections in the object. From the "micro" level, it is the electric fields of the protons and neutrons pressing against one another.
 
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Friction can be quite interesting. The Wikipedia article mentions situations when you can have friction even with zero or negative normal force. It gives adhesive tape as an example. Sometimes adding water (normally considered a lubricant) can also increase friction. For example many people lick their fingers when trying to turn the pages of a newspaper.
 

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