Re: L2-"Negotiating" a curve.

[Bob Sciamanda <trebor@VELOCITY.NET>]

Yes, the analogy is a little strained, but not much.  Just as the keel
(perhaps, better, the rudder) reacts with the water, so the wheel through
its interaction with the road allows the vehicle motion to be controlled
internally ( by adjusting the wheel's rotational speed and attitude), eg.
by braking the wheel's rotational motion or by turning the wheel.

Bob

Bob Sciamanda (W3NLV)
Physics, Edinboro Univ of PA (em)
trebor@velocity.net
http://www.velocity.net/~trebor

----- Original Message -----
From: Ludwik Kowalski <KowalskiL@MAIL.MONTCLAIR.EDU>
To: <PHYS-L@lists.nau.edu>
Sent: Wednesday, November 03, 1999 11:30 PM
Subject: Re: L2-"Negotiating" a curve.


> Bob Sciamanda wrote:
>
> > ... The turned wheel is forced obliquely into the roadway, giving
> > rise to a reaction (frictional) force from the roadway.  The front
> > wheel bearing (and the wheel orientation) only allows the "forward"
> >  (ie. in the turned direction) component of that force to be
effective.
> The "roadway" is along the y axis. Yes, there is a large sliding
> friction force, in the direction of -y, resulting from steering. But
> that is all. The bearing is "deep inside", internal forces have no
> effect on the motion of the C.M. The keel of a sailboat, on the
> other hand, is in direct contact with the outside medium. Your
> analogy does not seem to behelpful.
> Ludwik Kowalski