\(\def \u#1{\,\mathrm{#1}}\) \(\def \abs#1{\left|#1\right|}\) \(\def \ast{*}\) \(\def \deg{^{\circ}}\) \(\def \ten#1{\times 10^{#1}}\) \(\def \redcancel#1{{\color{red}\cancel{#1}}}\) \(\def \BLUE#1{{\color{blue} #1}}\) \(\def \RED#1{{\color{red} #1}}\) \(\def \PURPLE#1{{\color{purple} #1}}\) \(\def \th#1,#2{#1,\!#2}\) \(\def \lshift#1#2{\underset{\Leftarrow\atop{#2}}#1}}\) \(\def \rshift#1#2{\underset{\Rightarrow\atop{#2}}#1}}\) \(\def \dotspot{{\color{lightgray}{\circ}}}\)

Coefficients of Friction

Here are some examples of coefficients of static and kinetic friction. Generally speaking, the "slipperier" the surfaces are against each other, the smaller the coefficients.

System	Static friction $\mu_S$	Kinetic friction $\mu_K$
Teflon on steel	0.04	0.04
Steel on steel (oiled)	0.05	0.03
Shoes on ice	0.1	0.05
Ice on ice	0.1	0.03
Waxed wood on wet snow	0.14	0.1
Steel on ice	0.4	0.02
Wood on wood	0.5	0.3
Metal on wood	0.5	0.3
Steel on steel (dry)	0.6	0.3
Rubber on wet concrete	0.7	0.5
Shoes on wood	0.9	0.7
Rubber on dry concrete	1.0	0.7