The term “coefficient of friction” refers to a dimensionless constant that represents the ratio of the force of friction between two bodies to the force pressing them together. There are two main types of coefficients of friction:
| Material Pair | Static Friction (μs) | Kinetic Friction (μk) |
|---|---|---|
| Rubber on Dry Concrete | 0.7 – 1.0 | 0.6 – 0.8 |
| Wood on Wood (Dry) | 0.3 | 0.2 |
| Metal on Metal (Lubricated) | 0.15 | 0.06 |
| Ice on Ice | 0.1 | 0.03 |
| Glass on Glass (Dry) | 0.9 | 0.4 |
| Teflon on Teflon | 0.04 | 0.04 |
| Aluminum on Steel (Dry) | 0.61 | 0.47 |
| Cork on Wood | 0.4 | 0.3 |
| Leather on Wood | 0.5 | 0.4 |
| Concrete on Concrete | 0.6 | 0.5 |
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