Re: pinhole friction with tires

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From: bliss (swise@lwhs.org)
Date: Thu Jan 27 2000 - 13:53:05 PST

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Message-Id: <200001272040.MAA21059@noontide.lwhs.org>
Date: Thu, 27 Jan 2000 13:53:05 -0800
From: swise@lwhs.org (bliss)
Subject: Re: pinhole friction with tires

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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>
>
>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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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

Next message: Heidi Black: "Re: pinhole friction with tires"
Previous message: MC elover: "math music scale"
Maybe in reply to: bliss: "pinhole friction with tires"
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