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-----Original Message-----tire
From: phys-l-bounces@carnot.physics.buffalo.edu [mailto:phys-l-
bounces@carnot.physics.buffalo.edu] On Behalf Of Brian Whatcott
Sent: Saturday, November 10, 2007 7:33 PM
To: Forum for Physics Educators
Subject: Re: [Phys-l] Another tire question
At 03:26 PM 11/10/2007, Rick T., you wrote:
Brian,upwards
To me, what is still in question is just how is the force that acts
ON THE WHEEL applied by the tire bead--which is the only part of the
intire
contact. I hope all agree that there is no force contribution ON THEWHEEL
from the air pressure.
...Supposing I am the Brian being addressed, I would concur that the
bead exerts considerable radially inwards and sideways (outwards)automobile
force on the rim when properly inflated, and it may be considered
strongly attached by frictional force to the rim of the usual
wheel.rim
If the tire in question is of the type that can hold its pressurized
structure without a rim, this is the kind that bears upwards on the
in the lower half, where the upper half can almost show daylight understructural
if underinflated.
I am not disposed to think of the sidewall and bead as structural
entities.
The entity in question is an inflated tire which has distinct
properties when inflated. If you take one of Jiminy the Clown's longWhen you press on a wall with the end of such a balloon, the wall is
slender rubber balloons, from the material of which toy giraffes
are built, you will easily see that it can pass a compressive force
from one end t'other
without changing shape, angles etc., etc.
Inflatable airplanes, of which there have been several prototypes
built also needed to handle both compressive and tensile forces via
inflated fabric. Why should the inflated tire wall cause such
consternation?
Brian Whatcott Altus OK Eureka!
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