Bošković, Ruđer Josip, Theoria philosophiae naturalis redacta ad unicam legem virium in natura existentium

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280. Id quidem abunde apparet in ipſo ſuperiore exemplo.
11Exemplum rei
in
ipſo globo
molli
incurren-
te
in planum
immobile
.
Ibi in fig.
43 globus (quem concipiamus mollem) advenit
oblique
per AB, &
oblique impeditur a plano ejus progreſ-
ſus
.
Non eſt velocitas perpendicularis AF, vel EB, quæ ex-
tinguitur
, durante AE, vel FB, uti diximus;
nec illa urſit
planum
CD.
Velocitas AB occaſionem dedit globo acceden-
di
ad planum CD uſque ad eam exiguam diſtantiam, in qua
vires
variæ agerent;
donec ex omnium actionibus conjunctis
impediretur
ulterior acceſſus ad ipſum planum, ſive perpendi-
cularis
diſtantiæ ulterior diminutio.
Illæ vires agent ſimul in
directione
perpendiculari ad ipſum planum juxta num.
266:
debebunt autem, ut impediant ejuſmodi ulteriorem acceſſum,
producere
in ipſo globo velocitatem, quæ compoſita cum tota
BO
perſeverante in eadem directione AB, exhibeat velocita-
tem
per BI parallelam CD.
Quoniam vero triangula rectan-
gula
AFB, BIO æqualia erunt neceſſario ob AB, BO æ-
quales
;
erit BEIO parallelogrammum, adeoque velocitas per-
pendicularis
, quæ cum priore velocitate BO debeat compone-
re
velocitatem per rectam parallelam plano, debebit neceſſario
eſſe
contraria, &
æqualis illi ipſi EB perpendiculari eidem
plano
, in quam reſolvunt vulgo velocitatem AB.
Interea ve-
ro
vis, quæ ſemper agit in partes contrarias æqualiter, urſe-
rit
planum tantundem, &
omnes in eo produxerit effectus il-
los
, qui vulgo tribuuntur globo advenienti cum velocitate e-
juſmodi
, ut perpendicularis ejus pars ſit EB.

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