International Correspondence Schools · Scranton, Pa. : The Colliery engineer co. · leaf 358
must be exerted parallel to . / /> in order to put the body in equilibrium—i. e., to balance the force which gravity exerts in pulling the body down the plane. If the rope r were parallel to ^/^, <ii-would represent the weight of P\ but, since r makes an angle /^S* with the plane, /* will not… … treat ^rt^ as though it were a compo-nent of the force acting in the rope—i. e., draw ^/^perpendicular to ad, in-stead of perpendicular to a e. Thereason for this is that if d c weredrawn perpendicular to <7 ^ it couldbe resolved into components, one ofwhich would be parallel to a d, a re-sult…
Railroad engineering
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