B; B, R thepressures perpendicular to the faces ofthe wedge at B, A; fiB, fiB the frictionon the wedge at those points; W theforce applied at the middle point of theback of the wedge, and a the angle betweenthe faces of the wedge; then resolvingthe forces which act on the wedge indirection of W… … 138 OP THE MECHANICAI, POWERS. W=2B Tsin-— ^cos|j, ft ibeing the coefiSeient of friction actually in operation. It may be remarked that in many cases the wedge is keptin its place by friction alone,—in such cases W=0, and .a a . . , a .•. sm- —/tcos-= 0; i.e. /« = tan-, which gives the coefficient…
Mechanics
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