Is Contact Force Responsible for Molecular Bending in Objects?

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Discussion Overview

The discussion revolves around the role of contact forces in molecular bending within objects, particularly during collisions and deformations. Participants explore the implications of these forces on both the book and the table, as well as the nature of collisions (elastic vs. inelastic) and the relationship between forces and deformation.

Discussion Character

  • Exploratory
  • Debate/contested
  • Technical explanation

Main Points Raised

  • One participant suggests that contact forces acting on the book may also bend the molecules of the book.
  • Another participant indicates that "bending" of molecules could be viewed as a metaphorical expression.
  • There is a question regarding whether collisions involve compression of both objects and how this relates to the classification of collisions as elastic or inelastic.
  • Some participants assert that there is compression (deformation) in both elastic and plastic collisions.
  • A participant questions the distinction between impulse force and reaction force in terms of surface deformation.
  • Another participant argues that both forces in Newton's 3rd Law are equivalent and that the designation of surfaces is arbitrary.
  • There is a discussion about whether forces cause deformation, with some stating that forces are quantitatively related to the amount of deformation.
  • One participant emphasizes that if there is deformation, then there must be forces, and vice versa, suggesting a philosophical aspect to the relationship.

Areas of Agreement / Disagreement

Participants express differing views on the nature of molecular bending, the role of forces in deformation, and the classification of collisions. There is no consensus on these topics, and multiple competing perspectives remain throughout the discussion.

Contextual Notes

Some statements rely on metaphorical interpretations of molecular behavior, and the discussion includes unresolved distinctions regarding the nature of forces and their effects on deformation.

tonyjk
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Hello,

When we have 2 bodies in contact with each other, for example a book lying on the surface of a table. The table's molecules bend a little bit because of the weight of the book thus producing the contact force. My question is this contact force acting on the book does also bend the molecules of the book?

Thanks.
 
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Yes.
 
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Only of you consider the "bending" of molecules as a metaphoric expression. :smile:
 
Hello Again,
During collision is there any compression of both objects? if yes, the collision is considered as elastic or non elastic ?

Thank you
 
Last edited:
tonyjk said:
Hello Again,
During collision is there any compression of both objects? if yes, the collision is considered as elastic or non elastic ?

Thank you
Yes, there is compression (deformation) for both elastic and plastic collisions.
 
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Is the impulse force makes the deformation of the surface and the reaction force makes it on the second surface?
 
tonyjk said:
Is the impulse force makes the deformation of the surface and the reaction force makes it on the second surface?
That's an irrelevant disctinction. Both forces in Newtons 3rd Law are on the same footing, and the choice which surface ist 1st and which 2nd is arbitary.
 
But do these forces make the deformation?
 
tonyjk said:
But do these forces make the deformation?
The forces are quantitatively related to the amount of deformation.
 
  • #10
A.T. said:
The forces are quantitatively related to the amount of deformation.
Ok but the forces do not deform the surfaces?
 
  • #11
tonyjk said:
Ok but the forces do not deform the surfaces?
If there is deformation, then there are forces. And vice versa. Physics tells you how they are related quantitatively. The rest is philosophy.
 
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