Re: [Phys-l] Another tire question

["Jeffrey Schnick" <JSchnick@Anselm.Edu>]

> -----Original Message-----
> From: phys-l-bounces@carnot.physics.buffalo.edu [mailto:phys-l-
> bounces@carnot.physics.buffalo.edu] On Behalf Of Edmiston, Mike
> Sent: Friday, November 09, 2007 10:12 AM
> To: Forum for Physics Educators
> Subject: Re: [Phys-l] Another tire question
>
> Brian W. said...
>
> > Sophisticated (in this context) means you can understand
> > a pneumatic tire can be contrived with NO contribution
> > from its upper half, and that this can be made to
> > function on a spoked wheel assembly.
>
> I guess I am not sophisticated because I cannot understand that unless
> the tire is internally sectioned.
>
> The spoked bicycle wheel/tire is no different than the auto
wheel/tire.
> The axle "hangs" from the top rim via the top spokes.  The rim "hangs"
> from the top sidewall of the tire.

No.  The bead hangs from the top sidewall.  The rim is supported from
below by the bead.

> If you want much support from the bottom rim, that force can't come
from
> the bottom sidewall in an ordinary tire, because the bottom sidewall
is
> in tension, not compression.  However, if the tire would be internally
> sectioned into cells spaced around its circumference, the air pressure
> in the bottom cells could be more than the air pressure in the top
> cells, and the bottom of the rim would be pushed upward by the
increased
> air pressure down there.
>
> Michael D. Edmiston, Ph.D.
> Professor of Chemistry and Physics
> Bluffton University
> Bluffton, OH 45817
> (419)-358-3270
> edmiston@bluffton.edu
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