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Re: friction



Herb Gottlieb asks

If this model is inapplicable, please tell us why it does not
apply in this case...

Why? How can I do that? It just isn't a good model in
this case.

The one-parameter model of sliding friction represents
approximately many, but far from all, cases of sliding
friction. It is not fundamental physical law, and that
should be pointed out when it is first exposed to
students. It does not have the status of, for example,
the seesaw or lever law which might be taught at the
same level.

Leigh