Elementary natural philosophy : designed for high schools and academies (1881)
Griffin, La Roy F. (La Roy Freese), 1844-1916 · Philadelphia : Sower, Potts & Co. · leaf 50
lis ig iUug_ trated in the case of Gravity.* Considering a body asmade up of molecules each ofwhich is acted upon by gravity,the line of direction becomes theresultant. » 137. The principle of parallel forcesadmits of experimental proof by meansof the apparatus cf Fig. 37. Twoweights are suspended… … 138. If iwo forces1 act in opposite directions, the result-ant is their difference. Thus in Fig. 38, B D acts in a direc-tion opposite to A C. E F, the result-ant, is their difference. But it mustbe applied beyond A at E. so that thedistance shall be inversely propor-tional, as before ; that is…
Physics
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