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Yes and No
Patrick,
Your experiments must have some other variables coming into play. Mu is a constant of proportionality as defined by experiments. Its purpose is to show the relationship between "relatively flat" objects sliding against one another. When you have spikes or other geometry such that you have many such defineable surfaces in many orientations, Mu no longer holds true. I agree with you that Mu has its limitations, but Mu does not change with respect to weight.
-Paul
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