It doesn't quite work that way. You don't specify the coefficient of friction for "glass", or from "wood", etc.; you specify the coefficient of friction between a PAIR of substances, sometimes also including any substance in between, such as lubricants. For example, you would specify the coefficient of friction:* Between glass and glass (dry)
* Between glass and glass (wet)
* Between glass and wood
* Between wood and wood
* Between tiles and leather (this might be interesting, since shoes are often made out of leather)
etc.
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