Values from General Physics, by D. C. Giancoli, 1984

 

These values are approximate and should be used only as a guide.

 

Surfaces

ms
(Coefficient of Static Friction)

mk
(Coefficient of Kinetic Friction)

Wood on wood

0.40

0.20

Wood (waxed) on wet snow

0.14

0.10

Ice on ice

0.10

0.03

Lubricated metal on metal

0.15

0.07

Unlubricated steel on steel

0.6

0.3

Rubber on solids

1 - 4

1

Lubricated ball bearings

< 0.01

< 0.01

Synovial joints in human limbs

0.01

0.01