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 150
form:When several forces act simultaneously upon a body, eachforce produces exactly the same effect which it wouldhave produced if it had acted singly. This principle istrue whether the body was originally at rest or in mo-tion, and it extends as well to the case where the forcesbalance one… … In the first case (a), supj)ose two forces P and Q to actsimultaneously upon the same particle; each will havethe same effect as if it acted alone, and (71) it is meas-ured by the velocity it gives in a certain time, and itsdirection is that of this velocity; therefore if these velo-cities are…
Mechanics
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