An elementary treatise on theoretical mechanics (1893)
Ziwet, Alexander, 1853-1928 · New York, London, Macmillan and Co. · leaf 137
transfer, say X, weintroduce at P, the foot of the perpendicular let fall from P onthe plane zx, two equal and opposite forces X, —X; and we dothe same thing at O. Then the single force X2X P is replacedby the force X at (9 in combination with the two couples formedby X at /, -X at /, and X at P,… … Fig. 70. couple rotates clockwise. The vector of the latter couple isparallel to Oy, and its moment is zX. The transfer of Y to the origin O requires the introduction oftwo couples, —^•F having its vector parallel to Ox, and xYhaving its vector parallel to Oz. Finally, transferring Z to O, we have…
Mechanics, Analytic
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