Coefficient of friction of different materials

• μs of steel on steel

  0.74
• μk of steel on steel

  0.57
• μs of aluminum on steel

  0.61
• μs of copper on steel

  0.53
• μs of rubber on concrete (wet)

  0.3
• μs of rubber on concrete (dry)

  1.0
• μs of wood on wood

  0.25-0.5
• μs of glass on glass

  0.94
• μs of teflon on teflon

  0.04
• μs of waxed wood on wet snow

  0.14
• μs of waxed wood on dry snow

  0.10
• μs of metal on metal (lubricated)

  0.15
• μs of ice on ice

  0.1
• μs of synovial joints in humans

  0.01
• μk of aluminum on steel

  0.47
• μk of copper on steel

  0.36
• μk of rubber on concrete (dry)

  0.8
• μk of rubber on concrete (wet)

  0.25
• μk of wood on wood

  0.2
• μk on glass on glass

  0.4
• μk of teflon on teflon

  0.04
• μk of teflon on steel

  0.04
• μk of waxed wood on wet snow

  0.1
• μk of waxed wood on dry snow

  0.04
• μk of metal on metal (lubricated)

  0.06
• μk of ice on ice

  0.03
• μk of synovial joints in humans

  0.003
• μk of very rough surfaces

  1.5