Linked Questions

-1
votes
2answers
7k 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 ...
2
votes
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
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
0answers
63 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?
0
votes
1answer
43 views

Why doesn't friction depend upon area of contact? [duplicate]

Even though the pressure increases when the area of contact decreases why doesn't friction increase with decrease in area?
1
vote
0answers
26 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 ...
46
votes
2answers
11k 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 ...
5
votes
3answers
22k 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 ...
2
votes
2answers
575 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
2answers
565 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
390 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
139 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 ...
0
votes
2answers
72 views

Why does the force of air resistance depend on contact area but friction doesn't?

Isn't Air resistance very similiar to friction? So why is air resistance an exception that depends on contact area compared to other frictional forces?
-3
votes
1answer
85 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 ...