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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 |
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| 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) | 0.15 | 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.)
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'There must be no barriers for freedom of inquiry. There is no place for dogma in science. The scientist is free, and must be free to ask any question, to doubt any assertion, to seek for any evidence, to correct any errors.'
J. Robert Oppenheimer
(1904- 1966)
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