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 182
moreforces with respect to any point in their plane is equalto the moment of their resultant. Let AB, AD (Figs. 88, 89, 90) represent two forces,P and Q ; AC, the diagonal of the parallelogram A BCDconstructed upon them, will be their resultant (R). Thealgebraic sum of the moments of AB (= AB.Eb)… … DCB (Fig. 88), and hence the moments of P, Q, and Rare all of the same kind. The triangle ABE is equalto the sum of the triangles ADC and EDC, for they 164 STATICS. [155, have equal bases, AB and DC, and the altitude of thefirst triangle—that is, the perpendicular from E on AB—is equal to the sum…
Mechanics
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