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ank_gl
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dont have much time, ll make it quick
does friction depends on area of surface of contact??
i don't think it does
does friction depends on area of surface of contact??
i don't think it does
well anybody can be considered as a join of two saperate bodies, therefore your concept of negative loading is plain stupidAlephZero said:It doesn't apply at all for many combinations of materials. For, example, if surfaces are coated with adhesive there can be a "friction force" even when the normal load is negative!
so what is the law goverining friction which covers the term of area? just the point that coulomb didnt thought of this situation, doesn't make his law invincible. if a law is failing at a point, it should be scrapped or should be conditionalised.AlephZero said:Car tyres are just one example where the Coulomb friction model isn't adequate to explain what you observe. And since Coulomb died in 1806, he certainly never thought about the friction of synthetic rubber on asphalt when he proposed his "law".
ice109 said:
What?ice109 said:
kach22i said:What?
Nothing about hovercraft in that link?
The amount of friction between two surfaces does not depend on the area of surface of contact. Friction is determined by the types of materials in contact, the force pressing the surfaces together, and the roughness of the surfaces.
Increasing the area of surface of contact does not necessarily increase or decrease friction. The amount of friction depends on the force pressing the surfaces together, not the area of contact.
There is no specific maximum area of surface of contact that will produce the most friction. As mentioned before, friction is determined by the force pressing the surfaces together, so the maximum friction will depend on the specific materials and forces involved.
The roughness of the surfaces does have an impact on friction. Rougher surfaces have more friction because there are more points of contact between the surfaces, which creates more resistance to motion.
The area of surface of contact does not affect the type of friction present. The type of friction (static, kinetic, or rolling) is determined by the motion between the surfaces, not the area of contact.