Coefficient of Friction Testing

[JamesTerm]

Originally Posted by Ian Curtis

Fun question: Is dynamic friction a constant with respect to velocity? I know a Physics 101 textbook will tell you it is, but I wonder if you ask a tribology (isn't that a fun word) expert about the dynamics of tread on carpet Iwhat the answer is. Or if anyone has ever tested it?

That is, do you have the same coefficient of friction with a tire sliding at 1 ft/s as you do with a tire sliding at 10 ft/s.

I find this interesting... I've never heard it called dynamic friction (just static or kinetic)... so I googled around... it appears kinetic and dynamic are synonymous, but now I wonder if dynamic means in terms of velocity. Kinetic friction is very clear... its either static or kinetic values depending on if object is moving, but is there some cutoff point where the value changes from one state to another or is it a blend. This is one reason why I find the test methods interesting. In code I measure the value 0 velocity against a theshold of around 1E-05.