Normal Force Explained: What It Is & Why It Exists

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Discussion Overview

The discussion revolves around the concept of normal force in physics, exploring its definition, characteristics, and underlying mechanisms. Participants seek to clarify what normal force is and why it exists, touching on theoretical and conceptual aspects.

Discussion Character

  • Conceptual clarification, Technical explanation

Main Points Raised

  • One participant defines normal force as a force that is perpendicular to the plane of action, contrasting it with shear force, which acts parallel to the plane.
  • Another participant emphasizes that the normal force prevents objects from passing through each other, attributing this to electromagnetic repulsion between electrons in the atoms of the objects.
  • A different perspective is presented, stating that normal force acts as the equal and opposite force to gravity when an object is on the ground, describing it as the ground pushing up against the object.
  • Some participants mention the relationship between normal force and friction, indicating that friction acts parallel to the surface and is influenced by the normal force.

Areas of Agreement / Disagreement

Participants express various interpretations of normal force, with no consensus reached on a single definition or explanation. Multiple competing views regarding its nature and role are present.

Contextual Notes

The discussion includes assumptions about the nature of forces and interactions at the atomic level, which may not be fully articulated or agreed upon by all participants.

albert1993
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So I was wondering what normal force exactly is and why or how it exists. Can someone help me understand it? A link to some page describing it would be great too. Thanks.:)
 
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A normal force is one that is 'normal' or perpendicular to the plane of action, as opposed to a shear force which acts parallel to the plane of interest.

For an object (e.g., block) on an a 'flat surface', the normal force points perpendicularly to the flat surface. No motion would occur in the normal direct, but that force would be static and balance by a force pushing against the normal force. If friction is considered, the friction is perpendicular to the normal force, or parallel to the 'flat surface'.

There is a discussion here - hyperphysics.phy-astr.gsu.edu/hbase/frict.html - but the site seems to be down at the moment.
 
To add to what is above, the normal force is the force that prevents objects from simply passing through each other. It is the electromagnetic repulsion of the negatively charged valence electrons in the atoms of the objects in quesiton.
 
"Normal Force" is also the force that is the "equal and opposite force" of gravity if you're on the ground.

It's essentially the force of the ground pushing up on you so that you don't just pass through it.
 

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