There are many people who still claim that a material has a coefficient of friction. We need to remind these people that it is a system effect and a couple is required. There is also a need to restate some of the fundamentals that are known about the frction force, rolling friction, and traction. This appendix is an optional appendix to serve this purpose.
Keywordscoefficient of friction; data analysis; friction coefficients; friction/frictional properties; kinetic coefficient of friction; static coefficient of friction; triboelements; Coefficient of friction (COF); Data analysis; Friction coefficients; Friction/frictional properties--metallic materials; Kinetic friction analysis; Static coefficient of friction; Static tests--metals/alloys; Triboelements;
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