Re: School Science competition!!! Please Read...

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#192

From: Dirk Broer
Date: Mon, 03 Apr 1995 00:00

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In article <Pine.A32.3.91.950402233158.234743B-100000@trumpet.aix.calpoly.edu>, Kenneth William Talley <ktalley@trumpet.aix.calpoly.edu> says:
>
>        This is in reply to Mr. MIT Keith Alverson.  One point from us 
>dumb farm boys out here at California Polytechnic at San Luis Obispo.  
>Just one quick little thing that may have been overlooked.  Your average 
>tire has about 35 lbs of pressure on it before it even goes on the car.
>

Well perhaps you shoul re-read the posting.  Keith specifically pointed
out that you need to know the contact patch.  

Let suppose the tire weighed 35lbs - then rolling along the ground the
contact patch should be about 1 sq inch.  Notice I didn't say 1 inch 
square.  Since the tire could be 5 in wide - the length of the contact
patch would be only 1/5th of an inch.

BTW, farm boy.  the average tire has 35 lbs_PER_SQUARE_INCH "on it"
Back to physics 101.

Where phsics 101 meets the real world, however, you must take into 
account side wall stiffness etc.  The tires are not perfect balloons.

Dirk

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From: oaddab@abacus.gsfc.nasa.gov (Dirk Broer)
Subject: Re: School Science competition!!! Please Read...
Date: 1995/04/03
Message-ID: <3lpsbo$ql0@post.gsfc.nasa.gov>
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references: <Pine.SGI.3.91.950329085251.21144A-100000@server.uwindsor.ca> <3lc329$avd@news.cs.brandeis.edu> <3lcd3t$dji@senator-bedfellow.MIT.EDU> <Pine.A32.3.91.950402233158.234743B-100000@trumpet.aix.calpoly.edu>
organization: NASA Goddard Space Flight Center -- Greenbelt, Maryland USA
newsgroups: can.schoolnet.phys.sr,k12.ed.science,sci.engr,sci.engr.mech,sci.physics,rec.autos.sport.tech,alt.autos.rod-n-custom

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