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Coefficients of Friction
Materials
Coeff. of Static Friction
s
Coeff. of Kinetic Friction
k
Steel on Steel
0.74
0.57
Aluminum on Steel
0.61
0.47
Copper on Steel
0.53
0.36
Rubber on Concrete
1.0
0.8
Wood on Wood
0.25-0.5
0.2
Glass on Glass
0.94
0.4
Waxed wood on Wet snow
0.14
0.1
Waxed wood on Dry snow
-
0.04
Metal on Metal (lubricated)
0.06
Ice on Ice
0.1
0.03
Teflon on Teflon
0.04
0.04
Synovial joints in humans
0.01
0.003
Source: Serway Physics for Scientists and Engineers 4th edition (p. 126.)
'One thing I have learned in a long life: that all our science, measured against reality, is primitive and childlike - and yet it is the most precious thing we have.'
Albert Einstein
(
1879-1955
)
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