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From: Larrybud on 28 Jul 2008 11:47 russotto(a)grace.speakeasy.net (Matthew T. Russotto) wrote in news:3ZadnUDIFqIzaOHVnZ2dnUVZ_tninZ2d(a)speakeasy.net: > In article > <Xns9ADC807EB5567larrybud2002yahoocom(a)204.153.245.20>, Larrybud > <larrybud2002(a)yahoo.com> wrote: >>> So, considering I can brake hard enough with the front to >>> unweight the rear without going over the bars, please explain >>> where skidding comes into play or how I'd stop any faster >>> using the rear brake. >> >>With both tires on the pavement, you've increased your >>coefficient of friction (assuming you're using both brakes). > > No, you haven't. Well of course you have. There's more surface area between tire and road with 2 tires on the ground vs. 1 tire on the ground. In addition to that, CoF decreases once sliding occurs. With 2 tires on the ground, because CoF is greater to begin with, it takes more force to start sliding in the first place. That's the reason dragers have huge wide tires.
From: N8N on 28 Jul 2008 13:06 On Jul 28, 11:47 am, Larrybud <larrybud2...(a)yahoo.com> wrote: > russo...(a)grace.speakeasy.net (Matthew T. Russotto) wrote innews:3ZadnUDIFqIzaOHVnZ2dnUVZ_tninZ2d(a)speakeasy.net: > > > In article > > <Xns9ADC807EB5567larrybud2002yahoo...(a)204.153.245.20>, Larrybud > > <larrybud2...(a)yahoo.com> wrote: > >>> So, considering I can brake hard enough with the front to > >>> unweight the rear without going over the bars, please explain > >>> where skidding comes into play or how I'd stop any faster > >>> using the rear brake. > > >>With both tires on the pavement, you've increased your > >>coefficient of friction (assuming you're using both brakes). > > > No, you haven't. > > Well of course you have. There's more surface area between tire > and road with 2 tires on the ground vs. 1 tire on the ground. > > In addition to that, CoF decreases once sliding occurs. With 2 tires > on the ground, because CoF is greater to begin with, it takes more > force to start sliding in the first place. > > That's the reason dragers have huge wide tires. No, you haven't. The only thing that changes the CF is static vs. dynamic (that is, rolling vs. sliding.) The available friction does not change in any meaningful way (using the classic model of friction, it does not change at all) with surface area; the only parameters that have any meaning are the CF between the two materials and the normal force (that is, weight of the bike/rider combination.) nate
From: Matthew T. Russotto on 28 Jul 2008 16:42
In article <Xns9AE977FCC2E80larrybud2002yahoocom(a)204.153.245.22>, Larrybud <larrybud2002(a)yahoo.com> wrote: >russotto(a)grace.speakeasy.net (Matthew T. Russotto) wrote in >news:3ZadnUDIFqIzaOHVnZ2dnUVZ_tninZ2d(a)speakeasy.net: > >> In article >> <Xns9ADC807EB5567larrybud2002yahoocom(a)204.153.245.20>, Larrybud >> <larrybud2002(a)yahoo.com> wrote: >>>> So, considering I can brake hard enough with the front to >>>> unweight the rear without going over the bars, please explain >>>> where skidding comes into play or how I'd stop any faster >>>> using the rear brake. >>> >>>With both tires on the pavement, you've increased your >>>coefficient of friction (assuming you're using both brakes). >> >> No, you haven't. > >Well of course you have. There's more surface area between tire >and road with 2 tires on the ground vs. 1 tire on the ground. Coefficient of friction is independent of surface area. -- There's no such thing as a free lunch, but certain accounting practices can result in a fully-depreciated one. |