Coefficients of Friction
| Materials | Coeff. of Static Friction s | Coeff. of Kinetic Frictionk |
|---|---|---|
| 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.)