Jordanus de Nemore, [Liber de ratione ponderis], 1565

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1derit ad f, sit e, in exitu. Item quum c, fuerit in u, fit f, e, in 3. quare ergo
quo plus descenderit, ponderosius erit c, ponderosius in u, f, quám in a,b.
Quia uero dum e, peruenit in u, f, pertingit c, in 3. t, longius erit a, f, quám
f, 3. quia gracilius continue, quia partes uelociores, et sic tandem adrum­
puntur.
Si res inaequalis ponderis in partem quamcunque impellantur, pars gra
uior occupabit.
Sit quod impellit a, b, pars grauior a. Si ergo impellatur ex parte a, et
b, impellatur, quoniam leuius est, facilius cedet pulsui.
quumque facilitatem
eius non sequatur a, frustrabitur quidem in se, et grauitate a, adiuuabit;
sicque totus uisus reuertetur ad a, habet ergo praecedere in suo impetu trahe
re b.
Si uero b, posterius impellatur, et praecedat a, impulsum quidem b, im
pellet a, leuitas 3. attrectabitur mouendo a, et ideo prius impelletur a, quia
motum ipsius plus impedit, totoque conatu in plurium habebit trahere b, ea
finiter liber Ioradam de ratione ponderis.
Et sic finit.

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