< Physics Study Guide 
	
 
      Approximate Coefficients of Friction
| Material | Kinetic | Static | 
| Rubber on concrete (dry) | 0.68 | 0.90 | 
| Rubber on concrete (wet) | 0.58 | -.-- | 
| Rubber on asphalt (dry) | 0.68 | 0.68 | 
| Rubber on asphalt (wet) | 0.53 | -.-- | 
| Rubber on ice | 0.15 | 0.15 | 
| Waxed ski on snow | 0.05 | 0.14 | 
| Wood on wood | 0.30 | 0.42 | 
| Steel on steel | 0.57 | 0.74 | 
| Copper on steel | 0.36 | 0.53 | 
| Teflon on teflon | 0.04 | -.-- | 
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