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X Search this book Q AA As seen in Table 5.1, the coefficients of kinetic friction are less than their static counterparts. That values of / in nce and Table 5.1 are stated to only one or, at most, two digits is an indication of the approximate description of friction given by the above two equations. Static friction Kinetic friction Laws of Hs HK System s Laws: Rubber on dry concrete 1.0 0.7 ns of Rubber on wet concrete 0.7 0.5 Wood on wood 0.5 0.3 Waxed wood on wet snow 0.14 0.1 Metal on wood 0.5 0.3 Steel on steel (dry) 0.6 0.3 Steel on steel (oiled) 0.05 0.03 Gravitation Teflon on steel 0.04 0.04 sources Bone lubricated by synovial fluid 0.016 0.015 ions Shoes on wood 0.9 0.7 lar Shoes on ice 0.1 0.05 Ice on ice 0.1 0.03 gical and Steel on ice 0.04 0.02 and the Gas Table 5.1 Coefficients of Static and Kinetic Friction The equations given earlier include the dependence of friction on materials and the normal force. The direction of erpendicular to the normal