Gravesande, Willem Jacob 's, Physices elementa mathematica, experimentis confirmata sive introductio ad philosophiam Newtonianam; Tom. 1

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11659MATHEMATICA. LIS. I. CAP. XVI. obtinet, quando Angulus EaD eſt obtuſus.
Lex III.
Actioni contraria ſemper & æqualis eſt reactio; ſive cor-
11247. porum duorum actiones in ſe mutuo ſemper ſunt æquales, &

in partes contrarias diriguntur.
Quomodocunque corpus in aliud agat, ipſum reactionem
æqualem &
contrariam pati ſemper videmus. Digito lapi-
dem premo, premitur æqualiter digitus a lapide.
Currume-
quus protrahit, à curru æqualiter retrotrahitur;
lora enim
æqualiter verſus utramque partem diſtenduntur.
Corpus in aliud impingitur, quæcumque ſit impreſſio,
utrumque æqualem patitur;
impreſſiones vero contrariæ ſunt:
illud pleniſſime confirmatur Experimentis circa colliſio-
nes corporum.
Magnes ferrum ad ſe trahit, trahitur æqualiter a ferro.
Experimentum.
Suſpenditur magnes M, ita ut facillime moveri poſſit, &
22248. ferro admoto ad certam diſtantiam, accedit magnes ad fer-
33TAB. X.
fig. 2.
rum;
& hoc retrahendo, antequam magnes ad hoc perve-
nerit, magnes ferrum ſequitur;
eodem omnino modo, ac
ferrum ad magnetem accedit, &
hunc ſequitur, quando il-
lud ſuſpenditur, &
magnes admovetur.
Sedet quis in cymba, cymbam aliam æqualem, & æqua-
liter onuſtam, fune trahit;
ambæ cymbæ æqualiter moven-
tur, &
in medio diſtantiæ primæ concurrunt: ſi una cym-
ba altera ſit major, aut magis onuſta, pro diverſis quanti-
tatibus materiæ in ſingulis celeritates erunt diverſæ.
Et hæc eadem lex generaliter in omnibus corporum a-
ctionibus in alia copora locum habet.
CAPUT XVII.
De Acceleratione & Retardatione Gravium.
Definitio 1.
MOtus acceleratus, eſt cujus celeritas omnibus momentis
44249. major fit.

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