I realize it is counter-intuitive, but the friction force is independent of
the area of contact and proportional to the weight.  The force is
calculated from laws formulated by Couloumb in 1781.

F = fN

Where F is the friction force, f is the coefficient of friction, and N is
the normal force, e.g. weight of the object.

Ken Shepard

On Mon, Aug 6, 2012 at 5:07 PM, John Holladay <docholladay0820@g...>wrote:

> Not that I am in any way smarter that Leonardo Davinci, but I must
> comment.  If you have two objects of identical size and weight, then the
> one with greater surface contact has to have more friction, therefore
> meaning more resistance to sliding.  It may be minute, but there would have
> to be some additional resistance.
>
> Doc
> On Aug 6, 2012 1:39 PM, "Ed Minch" <ruby@m...> wrote:
>
> >
> > On Aug 6, 2012, at 9:58 AM, Peter McBride wrote:
> >
> > > Ed,
> > > you might hear some folk convinced it makes a difference. However about
> > 500 years ago Leonardo Da Vinci stated..
> > > 1. the areas in contact have no effect on friction.
> > > 2. if the load of an object is doubled, its friction will also be
> > doubled.
> > >
> > > I did the test with a couple of bedrocks years ago, pulling them both
> > along a bench at the same time with an elastic band. It stretched the
> same
> > amount for both planes.
> > > It is one of those counter intuative laws of physics that entertain and
> > amaze.
> >
> > As I suspected.  What about the relationship between a transitional and a
> > iron plane - is the easier pushing because of the lighter plane?  What
> if I
> > wax the sole - it would be same if I waxed a corrugated sole?
> >
> >
> > Ed Minch
> > Everyone should be entitled to their own facts. Anything less is
> offensive
> > - Jeff Sessions (R)
> >
> >
> >
> >
> >
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