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From: shuster@oblio.DEC (ROBERT L. SHUSTER)
Newsgroups: net.physics
Subject: Friction
Message-ID: <956@decwrl.UUCP>
Date: Mon, 21-Oct-85 23:17:02 EDT
Article-I.D.: decwrl.956
Posted: Mon Oct 21 23:17:02 1985
Date-Received: Wed, 23-Oct-85 23:57:44 EDT
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Organization: Digital Equipment Corporation
Lines: 12


Here's another car/tire question:

It is very much easier to turn the wheel (using the steering wheel) of 
a moving car than that of a stationary car.  The surface area of tire 
on the road does not change as it begins to rotate.  The difference in 
ease of turning, then, is the difference between friction on 
stationary object and friction on a moving object.  What is the 
mathematical relation, in this case, between the two frictions?  Can 
this relation be generalized for other objects?

-R. Shuster