15_23_86 - COEFFICIENT OF FRICTION The coefficient of...

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15- 47 COEFFICIENT OF FRICTION The coefficient of friction between two surfaces is the ratio of the force required to move one over the other to the force pressing the two together. Thus if F is the minimum force needed to move one surface over the other, and W is the force pressing the sur- faces together, the coefficient of friction µ is given by µ = F / W . A greater force is generally needed to initiate movement from rest that to continue the motion once sliding has started. Thus the static coefficient of friction µ (static) is usually larger that the slid- ing or kinetic coefficient µ (sliding). This table gives characteristic values of both the static and slid- ing coefficients of friction for a number of material combinations. In each case Material 1 is moving over the surface of Material 2. The type of lubrication or any other special condition is indicated in the third column. All values refer to room temperature unless otherwise indicated. It should be emphasized that the coefficient
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15_23_86 - COEFFICIENT OF FRICTION The coefficient of...

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