Normal Force Explained: What It Is & Why It Exists

In summary, a normal force is a perpendicular force that prevents objects from passing through each other. It is equal and opposite to the force of gravity and is caused by the repulsion of electrons in the atoms of the objects. This force is also balanced by friction if present. A link for further explanation is currently unavailable.
  • #1
albert1993
18
0
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.:)
 
Physics news on Phys.org
  • #2
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.
 
  • #3
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.
 
  • #4
"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.
 

FAQ: Normal Force Explained: What It Is & Why It Exists

What is normal force?

Normal force is the force exerted by a surface on an object in contact with it. It is always perpendicular to the surface and acts in the opposite direction to any external force applied to the object.

Why does normal force exist?

Normal force exists because of the atomic and molecular interactions between the surface and the object. These interactions create a repulsive force that prevents the object from passing through the surface.

How is normal force different from other types of forces?

Normal force is different from other types of forces in that it only exists when there is contact between an object and a surface. It is also always perpendicular to the surface, whereas other forces may act in different directions.

Can normal force be greater than the weight of an object?

Yes, normal force can be greater than the weight of an object. This can happen when the object is accelerating or when the surface is inclined, causing the normal force to act at an angle.

In what situations is knowledge of normal force important?

Knowledge of normal force is important in many situations, such as calculating the weight of an object on an inclined surface, determining the maximum force a structure can withstand, and understanding the mechanics of objects in contact with surfaces.

Similar threads

I Uncovering the Forces on Drum Lugs: An Engineering Design Exploration
Replies
10
Views
3K
I Why is normal force always perpendicular to the surface?
Replies
6
Views
2K
Normal reaction force on banked track
Replies
18
Views
3K
B Normal Force: Questioning the Physics Behind It
Replies
13
Views
2K
Work done by a normal force (or rather, work NOT done)
2
Replies
57
Views
4K
Does pushing down on a book increase the Normal force?
Replies
7
Views
12K
Understanding Normal Forces: Explained and Demystified
Replies
10
Views
3K
Angle between normal force and radial line for cylindrical coordinates
Replies
21
Views
2K
B Normal Force Discrepancy for Wedge Vs. Ramp
Replies
9
Views
2K
A Normal force and force of friction inside a tube
Replies
2
Views
1K

Hot Threads

Recent Insights

Back
Top