Before revision: The following table shows the values of the static and dynamic friction coefficients for common materials: +Table of static and dynamic friction coefficients most usedContact surfacesStatic frictionDynamic frictionWood–wood0.25–0.50.2Wood–cardboard 0.32 0.23 Ice–ice0.1 0.02Scioled wood ski–snow 0.040.04Glass–glass 0.9–1.0 0.4Steel–steel (smooth) 0.6 0.6 Steel–steel (lubricated) 0.090.05Steel–ice 0.10.05Steel–ice (dry) 0.780.42Steel–aluminum 0.610.47Steel–brass 0.510.44Steel–air 0.0010.001Steel–Teflon 0.040.04Teflon–Teflon 0.040.04Rubber–cement (dry)1.00.8Rubber–cement (wet) 0.70.5Copper–steel 0.530.36Copper–glass 0.68 0.53Synovial joints 0.01 0.003 Rolling friction In the case of bodies capable of rolling, there is a particular type of friction, in which the sliding phenomenon, typical of dynamic friction, does not occur, but there is also a force that opposes the motion, which also excludes the case of static friction.
After revision: rolling frictionThe following table shows the values of the static and dynamic friction coefficients for common materials: +Table of static and dynamic friction coefficients most usedContact surfacesStatic frictionDynamic frictionWood–wood0.25–0.50.2Wood–cardboard 0.32 0.23 Ice–ice0.1 0.02Scioled wood ski–snow 0.040.04Glass–glass 0.9–1.0 0.4Steel–steel (smooth) 0.6 0.6 Steel–steel (lubricated) 0.090.05Steel–ice 0.10.05Steel–ice (dry) 0.780.42Steel–aluminum 0.610.47Steel–brass 0.510.44Steel–air 0.0010.001Steel–Teflon 0.040.04Teflon–Teflon 0.040.04Rubber–cement (dry)1.00.8Rubber–cement (wet) 0.70.5Copper–steel 0.530.36Copper–glass 0.68 0.53Synovial joints 0.01 0.003 Rolling friction In the case of bodies capable of rolling, there is a particular type of friction, in which the sliding phenomenon, typical of dynamic friction, does not occur, but there is also a force that opposes the motion, which also excludes the case of static friction.