Re: An old question?

[Brian Whatcott <betwys1@SBCGLOBAL.NET>]

At 08:12 PM 11/9/2003, you wrote:
> //the centripetal force is provided
> by the road; it is a familiar static friction force. ///
>
> The sidewise force would not appear (ideally), if all four
> wheels were suddenly locked///The sidewise
> force (to the left on my picture) appears only when wheels
> are rolling. Therefore, rotation of wheels should be an
> essential element of my explanation. ///
> Ludwik Kowalski

How's this?

A rolling tire and wheel and the deep hull of a sail-boat have
something in common.   They share this: a direction in which
movement is easy, and a direction in which movement is
difficult. When a car or sailboat turn, there is evidently a
force which procures the turn. So the question in hand is,
 what is the force that opposes the turning force?

  One understands the straight line momentum of either vehicle.
In the case of the steered tire, the body and suspension will
continue in the same direction, while the tire tread departs
 on a new heading. The car body heels  out in normal circumstances,
and the tire wall is also deflected sidewards.
This represents that the body and axle and wheel rim are pushing
outwards (to maintain their straight line motion), while the tire
tread is being pulled inwards.
I hasten to add that for both the sailboat and the car, the heeling
direction is not preordained: the respective heights of the center
of resistance and the center of gravity control the direction in
which the turning vehicle heels.

Brian Whatcott    Altus OK    Eureka!