What materials have the greatest coefficient of friction?
Well, when you are dealing with coefficient of friction, you need to have two materials. i.e. coefficient of friction of aluminum on polished wood, or rubber on concrete, and so on. As they say, there is no such thing as a one-handed clap, and to talk about coefficient of friction, you need to be talking about two objects. It appears that according to this list ( http://www.engineershandbook.com/Tables/… ), among the common materials, the material with the greatest coefficient of friction appears to be rubber (with fairly large variability). But there is a thin line between something that has high coefficient of friction and something that sticks to other objects, so that probably doesn’t say so much. Speaking of sticking, in the table linked above (also in the reference), you might notice that metal-metal coefficients are unusually high if the two materials are the same. That’s because when y
