Re: pinhole friction with tires

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From: Steven Eiger (eiger@montana.edu)
Date: Wed Jan 26 2000 - 12:48:15 PST

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Message-Id: <l03102802b4b50d8f76d3@[153.90.241.107]>
Date: Wed, 26 Jan 2000 13:48:15 -0700
From: Steven Eiger <eiger@montana.edu>
Subject: Re: pinhole friction with tires

If you get a car moving and shut it off it will not roll forever, even in
neutral. There is friction in moving parts, one of which is the tires.
They deform as they roll, squishing at the bottom. This heats up the
rubber, as it changes shape. Thus kinetic energy of car motion is
converted into heat. eiger

>My colleague and I were talking about how to calculate the friction
>coefficient between car tires and a road. We agree that it is probably a
>coefficient of static friction that we are looking for, as the tire and
>road surface do not slide with respect to each other as the car moves. But
>my colleague also seems to remember somewhere reading about "rolling
>friction" as distinct from static friction. We can't find it in any of our
>current books. Does anyone else have info about this?
>
>Cheers, Sarah Wise
>
>
>帘帘帘帘帘帘帘帘帘帘帘帘帘帘帘帘帘帘帘帘帘帘帘帘帘帘帘帘帘帘帘帘帘帘帘帘帘帘帘
>
>Sarah Wise
>
>Lick-Wilmerding H.S.
>755 Ocean Avenue
>San Francisco, CA 94112
>swise@lick.pvt.k12.ca.us
>
>"Not everything that can be counted counts,
>and not everything that counts can be counted."
>--Albert Einstein
>
>
>
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Steven Eiger, Ph.D.

Departments of Biology and the WWAMI Medical Education Program
Montana State University - Bozeman
Bozeman, MT 59717-3460

Voice: (406) 994-5672
E-mail: eiger@montana.edu
FAX: (406) 994-3190

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