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1. Knight writes that these equations are a "model" of friction, not a
"law" of friction because while they are reasonably accurate
descriptions of how friction forces act, they are not perfect. Because
they are simplifications of reality that work reasonably well, they are
more appropriately called "models", rather than laws.
I can see why Knight makes these points - he wants to distinguish
between "laws of nature" that are "always true" and empirical
relationships that are "mostly true". However, the way he is using the
terms "model" and "law" are not the way I would.