> OK. Why doesn't a top fuel dragster use a tire 3" wide? It would
> support the weight, and it would work just as well according to your
> contention that rubber tires work exactly like all other materials.
Negative... Although the 3" tyre and the 3' tyre would both have the
same amount of friction, the 3" tyre would wear away to nothing and pop
during the burn out because that much energy has to go somewhere...
--
RCOS #7
IBA# 11465
http://imagesdesavions.com
On 3/14/2010 8:09 PM, Mark Olson wrote:
> Stephen! wrote:
>>>> Surface area has no influence on friction.
>>> I'm sure you think you're 100% right, but unfortunately, if you're
>>> going to bring the physics professor into this, you need to include
>>> the full lesson, not just some of it if you don't want to make a fool
>>> of yourself.
>>
>> Prove me wrong.
> A simple reductio ad absurdum proof, coupled with what we have all
> observed in the real world, should be quite enough to convince you.
> Over some range of sizes you are mostly correct but to claim as an
> absolute principle that surface area doesn't matter ignores many
> other factors that aren't considered in a simplistic first order
> approximation of how friction coefficients work with real materials.
> No, I am not going to prove you wrong, you have claimed something
> that I very strongly doubt can be proven, but you are certainly
> free to give us *your* proof if you wish.
Find us a physics or engineering text that supports your contention.
All of them that I have ever read (and there have been many) state that
over the range of conditions normally encountered in engineering the
frictional force is a function of the normal force and the composition
of the materials, not a function of contact area. So does the
experience garnered in years of being paid to do engineering.
Since this is the generally accepted view, if you disagree with it it is
up to you to show that the textbooks and centuries of engineering
experience are wrong.
You state that there is a "simple reductio ad absurdum" proof but fail
to present it. You also state that there are "many other factors that
aren't considered" but fail to present any of those factors.
Now, tell us why anybody should believe you.
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> support the weight, and it would work just as well according to your
> contention that rubber tires work exactly like all other materials.