Linked Questions

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0answers
2k views

Why is friction proportional to normal force? [duplicate]

Surely, if you have 2 surfaces interlocking then a horizontal force would also result affect the force of friction. It seems unintuitive that friction is only proportional to normal force. Is there ...
0
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1answer
129 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 ...
1
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0answers
103 views

At a microscopic level, how does friction come into exist? [duplicate]

The simplest answer is that the protuberances on the rough surfaces have inelastic collisions on each other and thus have a macroscopic tendency to impede motion. Is there any more comprehensive ...
1
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0answers
34 views

Why does friction occur? [duplicate]

I'm pretty sure this is a rather stupid question but I just cannot wrap my mind around the reasoning behind friction. Now, an obvious explanation would be that since all surfaces are inherently rough,...
-1
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2answers
6k 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
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1answer
2k views

Which fundamental force is behind friction?

In day to day life we come across situations where friction is used. What is the fundamental force behind friction. For eg. which is the force behind interlocked objects like nut and bolt, which is ...
4
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6answers
207 views

How can static friction depend on the normal force, but be directed orthogonal to it?

According to my understanding: two orthogonal forces aren't related and two orthogonal vectors don't affect each other the force of static friction $F_s$ depends on the normal force $F_n$, so $$F_s = ...
2
votes
1answer
700 views

Why do we assume Kinetic friction to be constant?

My Physics teacher told me that friction exists because of bonds made between the surfaces of two objects. As we try to move an object, we break the bonds and this causes release of energy which is ...
0
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1answer
498 views

What is the cause of friction if atoms don't actually “touch?”

If according to physics, we cannot touch anything and the sensation appears only due to a repulsive force between the atoms, then how does friction occur?
4
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3answers
96 views

Are Frictional Forces Always Shear?

Is frictional resistance always shear? Two examples I am thinking of are the cases of friction between solid bodies and "friction" in viscous resistance?
2
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2answers
298 views

Friction in absence of normal reaction(in the context of macroscopic picture)

Take two flat non-smooth($\mu \neq0$) surfaces and rub them against each other .You feel the friction as you are doing work to displace them relative to each other. We usually think that friction ...
-1
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1answer
64 views

Are coefficients of friction the same in different gravitational fields?

For objects resting flat with $F_N = mg$, both gravity $g$ and coefficients of static friction $\mu_s$ play into calculating friction force by: $$F_{friction} = \mu_s F_N = \mu_s mg$$ This ...
2
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1answer
56 views

Is friction an emergent phenomenon?

The microscopic origin of the frictional forces is due to contact between irregularities of the surfaces as seen here [1]. Electromagnetic interactions are the fundamental forces responsible for ...