Source: http://en.wikipedia.org/wiki/Friction#Approximate_coefficients_of_friction
| Materials | Static friction | |
| Dry and clean | Lubricated | |
| Aluminium - Steel | 0.61 | |
| Copper - Steel | 0.53 | |
| Brass - Steel | 0.51 | |
| Cast iron - Copper | 1.05 | |
| Cast iron - Zinc | 0.85 | |
| Concrete - Rubber | 1.0 | 0.3 |
| Concrete - Wood | 0.62 | |
| Copper - Glass | 0.68-7 | |
| Glass - Glass | 0.94 | |
| Metal - Wood(MIN) | 0.2 | 0.2 |
| Metal - Wood(MAX) | 0.6 | |
| Polyethene - Steel | 0.2 | 0.2 |
| Steel - Steel | 0.8 | 0.16 |
| Steel - PTFE (Teflon) | 0.04 | 0.04 |
| PTFE (Teflon) - PTFE (Teflon) | 0.04 | 0.04 |
| Wood - Wood(MIN) | 0.25 | 0.2 |
| Wood - Wood(MAX) | 0.5 | |