[Phys-L] Re: getting tired

[Scott Goelzer <s.goelzer@COMCAST.NET>]

But the road cannot push up on what is not there. The area of the
patch would change if the tread was missing and a slick tire was
used. The correction is not small and is needed to get agreeable
results.

> If it were not, the between-tread rubber would be pushed between
> the tread until it also pressed on the road.

This gives me some insight on why steel belts are used.


Scott





*******************************************
Scott Goelzer
Physics Teacher
Coe-Brown Northwood Academy
Northwood NH 03261
sgoelzer@coebrownacademy.com
*******************************************


On Feb 7, 2006, at 7:28 PM, Michael Edmiston wrote:

> Scott Goelzer figures a percent-tread correction.  This does not make
> sense to me.  The air in the tire is not just pressing against the
> tread
> portion, it is also pressing against the inner surface of the tire
> between the tread.  The force from the between-tread air pressure is
> transmitted to the tread through the stiffness of the rubber and the
> belts.  If it were not, the between-tread rubber would be pushed
> between
> the tread until it also pressed on the road.  I would think you
> want to
> use the total contact patch area without any tread correction.
>
> Michael D. Edmiston, Ph.D.
> Professor of Physics and Chemistry
> Bluffton University
> Bluffton, OH 45817
> (419)-358-3270
> edmiston@bluffton.edu
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