A text book of elementary mechanics, for the use of colleges and schools (1881)
Dana, Edward Salisbury, 1849-1935 · New York, J. Wiley & sons · leaf 158
: sin BAC. 134.] COMPOSITION OF FOKCES. 139 Therefore P : Q : S = sin G4Z? : sin £^Z> : sin ,6^(7. Cor. The converse of this proposition is also true, andgives a second condition of equilibrium for three forcesacting on a particle, which may take the place of that inArt. 132—viz.: If of three… … Fig. 57. of the forces can fall between the directions of the othertwo; or, in other words, that the angular distancebetween no two of the forces can be greater than 180°.Thus the proportion may hold good for the three forcesin Fig. 57, and also those in Fig. 58; but only in theformer case is there…
Mechanics
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