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The doctrine of projectiles demonstrated and apply'd to all the most useful problems in practical gunnery : to which is added, the description and use of a new mathematical instrument, together with serveral curious properties of projectiles never before publish'd / by William Starrat
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6

Of Simple Motion.LAW II.

The Change of Motion is alwaysproportionable to the moving Forceimpressed, and is always made accor-ding to the Right-Line in whichthat Force is impressed.

The first Part of this Law is plainfrom the second Axiom y for if anyForce generates a certain Motion orChange of Motion, double that Forcewill generate double, and triple,triple, and because this Moti-

on, or C hange in Motion, is alwaysdetermind by the moving Force, itwill be made according to its Direc-tion 5 (by Law i.) for if the Bodywas in Motion before, and if the newimpressed Force was in the fame Di-rection, it will add to the formerMotion, if opposite to it, it will de-duct from it 5 if impressed in an ob-lique