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Re: [Phys-l] Another tire question



-----Original Message-----
From: phys-l-bounces@carnot.physics.buffalo.edu [mailto:phys-l-
bounces@carnot.physics.buffalo.edu] On Behalf Of Rick Tarara
Sent: Friday, November 09, 2007 10:35 AM
To: Forum for Physics Educators
Subject: Re: [Phys-l] Another tire question


----- Original Message -----
From: "Jeffrey Schnick" <JSchnick@Anselm.Edu>

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.


Do you mean the rim/wheel is pushed up from below by the bead,

Yes, as in my previous message in this thread:
<https://carnot.physics.buffalo.edu/archives/2007/11_2007/msg00071.html>


or that a
rim
on the top of the wheel that traps the bead is pushed up by the bead.
The
latter is, IMO, the same as hanging from the bead which is hanging
from
the
sidewall.

The bead is not trapped in the sense that, if it weren't for the tension
in the bead, you could pull any piece of it radially outward, away from
the center of the circle formed by the bead.
The bead's position is constrained by the hub in the following sense:
Viewing a rear wheel a position behind the car, directly behind the rear
wheel you are looking at: The rim is shaped so that the right bead can't
slide rightward off the rim, and the rim is shaped so that the left bead
can't slide leftward off the rim.

Look at the bead seat in the diagram
<http://www.alloywheelsindia.com/images/crosssection.jpg>
referenced by John Denker in the message (in this thread) at
<https://carnot.physics.buffalo.edu/archives/2007/11_2007/msg00034.html>


Seems to me that an answer to this is to carefully look at a car
wheel--
does
anyone have one available or can you get down to a HS auto shop? IS
the
bead of a mounted tire trapped or not (I'm thinking not). If not
trapped,
then I can't see how the wheel can hang from the bead. If it is
trapped,
that is certainly a possibility.


Rick

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