Martin, Louis Adolphe, 1880- · New York, J.Wiley & Sons, Inc.: [etc. etc.] · leaf 125
isshown as a free body when the wedge is about to starttowards the left under the action of the force P. Notecarefully the directions of the various reactions of the sur-faces of contact. As friction invariably opposes the mo-tions about to occur the reactions are inclined to thenormal at the… … ,p.a Fig. 76 The actual lines of action of the reactions are not indi-cated; in fact these are indeterminate; only their direc- rSICTION — APPLICATIONS TO MACHINES 109 tions are known, and as in each case only three forces actwe know that their lines of action must pass thru onepoint. From the…
Mechanics
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