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Article #859

Re: Aggressive Driving

#859
From: Dennis Jensen
Date: Mon, 13 Jul 1998 00:00
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In article <6o4uee$3og@urth.autarch.com>,
   caj@urth.autarch.com (Craig A. Johnston) wrote:
>In article <6o3r6j$3jc_003@dwt.csiro.au>,
>Dennis Jensen <Dennis.Jensen@dwt.csiro.au> wrote:
>>
>>Earl, there is a static CoF and a kinetic CoF-the kinetic relates to 
>>deceleration CoF. I think that you are being deliberately obtuse here.
>
>Hrm?  Maybe I missed something here, but a good driver can brake
>continuously under static friction at impending lockup.
>

Yep, but the point that Earl was making (both with skidmarks and other 
mentions) indicates to me that his "deceleration CoF is in fact kinetic CoF).

>In fact, in the dry good drivers can beat ABS systems.  
>
>_Either_ coefficient relates to decelerating in a car -- static
>when you don't lock up the wheels and kinetic when you do.  
>
>(of course all this simple stuff like force of friction = normal
>force * coefficient of friction goes to hell in the wet where 
>things become more complicated, as I recall.)
>
>Is the assumption that everyone locks their tires in a panic
>stop?
>
>Just curious, because I almost never lock mine.  (you learn this
>quickly braking hard with the front brake on a motorcycle.  If your
>front wheel locks up, you can probably kiss it goodbye.)

Apart from what I stated earlier, I agree 100%.

Dennis
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From: Dennis.Jensen@dwt.csiro.au (Dennis Jensen)
Subject: Re: Aggressive Driving
Date: 1998/07/13
Message-ID: <6obnv5$1p4_004@dwt.csiro.au>
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Newsgroups: dc.driving,rec.autos.driving,misc.legal,alt.law-enforcement,seattle.general,ca.driving