Re: pinhole friction with tires

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From: Heidi Black (blackh@exchange.esuhsd.org)
Date: Thu Jan 27 2000 - 13:19:36 PST

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Message-ID: <3890B667.355693BD@exchange.esuhsd.org>
Date: Thu, 27 Jan 2000 13:19:36 -0800
From: Heidi Black <blackh@exchange.esuhsd.org>
Subject: Re: pinhole friction with tires

Alaska Science Forum

October 19, 1987

Three Kinds of Friction
Article #843

by Sue Ann Bowling

This article is provided as a public service by the Geophysical Institute, University of Alaska Fairbanks, in cooperation with the
UAF research community. Dr.
Sue Ann Bowling is an Associate Professor of Physics at the Institute.

http://www.gi.alaska.edu/ScienceForum/ASF8/843.html

Here is the title and web address of a related article. Hope it helps,
Heidi

bliss wrote:

> Thanks Steve and Heidi. Things are getting clearer. Final question: is
> there a way to compute rolling friction? Is it the same as other types of
> friction, just with a different coefficient? Or is there a value for the
> deformation of the tire?
>
> Also, if a tire is not very deformable (i.e. metal tires on our dynamics
> carts), then does the rolling friction approximately equal the static
> friction?
>
> Cheers, Sarah
>
> >Sarah,
> >When you hit the brakes hard, locking up the wheels, they slide over the
> >road. This is kinetic friction. It is like sliding a block across the
> >table. It usually requires a larger force to get the block moving
> >initially, this is static friction, the force holding the block or wheel
> >static tot he surface. Rolling friction is different from these two as the
> >wheel is statically adhering to the road, yet as it rolls it deforms, this
> >deformation degrades energy. The earlier answer implied that deformable
> >objects are easier to slide than roll. obviously this is very dependent on
> >the vlaue of kinetic friction and the rolling resistance. For a tire, even
> >on a gym floor, it is much easier to roll it than to drag it. Of course,
> >it does not deform nearly as much as a rolled up gym mat as they both roll.
> >eiger
> >
> >>So from Heidi's answer I see that other people do teach the concept of
> >>rolling friction. Is rolling friction distinct from static friction though?
> >>I'm still confused. Sarah
> >>
> >>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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> >>
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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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> >with the words 'unsubscribe pinhole' (without the quotes) in the SUBJECT of
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> >
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>
> 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
>
> ---------------------------------------------------------------------------
> To unsubscribe from pinhole, send an email to requests@exploratorium.edu
> with the words 'unsubscribe pinhole' (without the quotes) in the SUBJECT of the email.
>
> To subscribe to the digest and only get 1 combined message a day, send an
> email to requests@exploratorium.edu with the words 'subscribe digest pinhole' (without the quotes) in the SUBJECT of the email.
> ---------------------------------------------------------------------------

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