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# Title: [Philosophiae Naturalis Principia Mathematica] Philosophiæ Naturalis Principia Mathematica (shelfmark Leibn. Marg. 166)
# Folio 13, page id 1041163592:0047
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PRINOIPIA MATHEMALIA
L F X TII.
actioni contrariam semper es aequalem esse reactionem: sive cor-
porum duorum actiones in se mutuo semper esse aequales e in par-
tes contrarias dirici.
Ouicquid premie vel trahie alcerum, tancundem ab eo premitur
vel trahitur. Si quis lapidem disito premit, premitur de hujus
disitus a lapide. Si equus lapidem funi alligatum crahit, retrahe
cur etiam ex equus (ue ita dicam) aequaliter in lapidem: nam Funis
utrinque distentus eodem relaxandi se conacu urgebit equum ver-
Tus lapidem, ac lapidem vertus equum; tantumque impediet pro-
srectum unius quantum promoret prooressum alterius. Si corpus
aliquod in corpus aliud impingens, motum ejus ri lua quomodo-
cunque mutarerie, idem quoque ricissim in motu proprio eandem
mutationem in partem contrariam ri alterius (ob aequalicacem prel-
Tionis mutuX) Subibit. Ilis actionibus aequales Aunt mutaciones,
non velocitacum, sed moruum; scilicet in corporibus non aliunde
impedicis. Mucationes enim velocitatum, in concrarias icidem
partes Factae, quia mocus aequaliter mutantur, sunt corporibus re-
ciproce proportionales. Obtinet criam haec L ex in Aerractionibus;
uc in Scholio proximo probabitur.
COROLLREIUMI
Corpus viribus conjunctis diasonalem parallelogrammi eodem rem
Pore describere, quo latera separatis.
Si corpus dato tempore, vi Cola
M in loco Aimpressa, Ferretur uni-
Formi cum moci ab A ad B; e vi
Cola N in eodem loco impressa, Fer-
retur ab A ad C: compleatur p2.
ralleloorammum ABDC, ec vi utra
que Feretur id eodem tempore in diagonali ab  act . LFau 9a0-
niam vis Nagic secundum lineam AC ips B D parallelam, h~CHIS PCt
Lesem it nihil mucabie relocitarem accedendi ad lineam illam B D
ari altera genitam. Acceder igitur corpus eodem cempore ad lincam
BD, Sive ris N imprimatur, sire non; acque adeo in sinc illius tempo-
ris reperietur alicubi in linea illa B D. Eodem argumento in finerem-
Doris ejusdem reperietur alicubi in linea C. D, e idcirco in ueriusque
Linex Concursu D reperiri neceNC eAt. PErGCE AuTEM motu rectiLI
neo ab Aad D Per LcgCm L.
OROL
LEOEC
MOTVSO