( ^75 ) 
i;/ .. ' 
EXP E R I M E N T VI. 
I tried the Experiment with the Weight C hanging . 
at the String m c (^as in Experiment III.) and a Fall from 
an height of five, or near five Inches, was required to 
raife double the Weight in the oppofite Scale, that a 
fall from one Inch would raife ; only here the heighth 
above four Inches was not fb great as in the former 
Experiment, the Frid:ion being lomething lefs. Then 
I fufpended the great Ball C (or C x) by the String m r, 
and when by falling one Inch it raifed the Weight P, 
the little Weight C could not produce the fame Effedf, 
without falling from a greater height than four Inches. 
It , is here to be obferved, that which way foever 
thefe Experiments are tried, the Objed:ions rifing from 
the Frid:ion do no way ferve to confirm the new Opi- 
nion, becaufe they fliew that (upon account of the 
Frid:ion) the Heights muft be fomething more than in 
a duplicate Proportion of the Velocities, but never lef^ 
to give a Blow with the fame Body in Proportion to 
the Velocity. 
That the Momentum of Bodies is in Proportion to the 
Mafs multiplied into the Velocity, is alfo moft evidently 
Ihewn from the Congrefs of elaflic Bodies, as has been 
demonflrated by Sir Ifaac Newton in his ^rincifidy 
in the Corollaries to his Laws of Motion, ' I had often 
tried the Experiments there mentioned with Balls of 
Ivory and Balls of Glafs, and fbme of them with two 
Balls of Steel, of two Ounces each, and found every 
thing anfwer, allowing for the want of perfedf Elafti- 
city in the Bodies. But now upon this Occafion,. as 
the Objedfions to the receiv’d Opinion were re- 
newed, I was willing to repeat the Experiments with 
the utmoft Accuracy and therefore, as Ivory Balls 
are 
