Linked Questions

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2answers
5k views

Why does friction does not depend upon area of contact? [duplicate]

Why does friction does not depend upon area of contact ? Now we know that friction=(coefficient of friction)*Normal.So also is, why does friction arise.Is it because of the irregularities of a surface ...
1
vote
2answers
6k views

Does friction depend on the area of the surface? [duplicate]

Do the frictional forces vary from each other when different objects try to move on a surface? The materials, sizes, shapes are different from each other.
1
vote
1answer
2k views

Friction force and contact area [duplicate]

It's usually stated that the friction force is independent of the area of contact (Amontons' Second Law). I've always thought that this shouldn't be true, because the atraction between molecules ...
1
vote
0answers
60 views

Does friction depend on the area between bodies thats in contact? [duplicate]

Does friction depend on the area between bodies thats in contact? If yes why we make threads on vehicles tires and below shoes? Does it not cause reduce in friction?
1
vote
0answers
24 views

In practical, how to find the friction of rubber vs plastic? [duplicate]

I did an experiment. The experiment was to use a gripper which had rubber fingers to grip a plastic rod which attached to a mass. After that I had a linear motor to move the gripper. What I wanted ...
41
votes
2answers
9k views

Why is the equation for friction so simple?

The general equation for the force of friction (static or kinetic) is $F_f = \mu * F_N$, where $F_f$ is the force of friction and $\mu$ is the coefficient of friction (its value is dependent upon the ...
3
votes
3answers
20k views

Does the contact area affect friction forces?

I recall studying a law of friction some years ago, in engineering school. All I remember is that when first approximation was taken, the popular $f=k \times N$ was derived. What could that be? Or if ...
1
vote
2answers
526 views

Is friction a function of surface area? What is the microscopic workings of friction?

I know the friction is given by the following equation $$\mu F_N=F_f$$ which tells me friction is independent of surface area, but how do I characterize it as such if I want to add surface area into ...
4
votes
1answer
495 views

Heuristic equation for Friction force between materials

I'm programming a game where different types of objects will be sliding over different types of terrains (Top-down in two dimensions). At my current level of physics education we are given the ...
4
votes
2answers
371 views

If friction disregard area, why the direction you drag a long object matters?

I am talking here about dry friction between solid objects, for example a ruler and a table, not anything lubricated or fluid. I noticed that with a ruler and a table for example, if you drag the ...
0
votes
1answer
120 views

Friction is not proportional to area [duplicate]

I'am a maths undergraduate and trying to self study fundamental physics.One with the first unituitivle statements i stumble upon was ."friction does not have anything to do with the area an object ...
-3
votes
1answer
69 views

Dependency of kinetic friction [duplicate]

1.Why kinetic friction doesn't depend on speed of object? Also explain why static friction > kinetic friction > rolling friction? 2.when we keep a book on a table , the table is said to exert a ...