C 59 ) 
Now this Experiment Ihews, that if two Globes in 
Motion bear againft equal Portions of the yielding 
Subfiance, the Oppofition, that Subfiance .makes to 
the Motion of the Globes, will be the fame in both, 
i| however difFerenc the Velocities be, with which they 
I move. This I fliall. demonflrate as follows. 
Let A and B be two Globes, equal in Magnitude, 
but of different Weights, which are equally immerfed 
t into a yielding Subfiance, Suppofe the Velocities, with 
r which they move in their prefent Situation, to be reci- 
I procally in the Subduplicate rath of the Weights of 
the Globes ; that is, let the ratio of the Weight of the 
Globe A to the Weight of the Globe ,5, be Duplicate of 
I the ratio of the Velocity of the Globe to the Velo- 
city of the Globe A, Since therefore the ratio of the 
quantity of Motion in the Globe A^ or of the force 
with which it moves, to the quantity of Motion in the 
Globe B, or to the force with which that Globe moves, 
is compounded of the ratio of the Weight of the Globe 
A^ to the Weight of the Globe and of the ratio of 
the Velocity of the Globe A<^ to the Velocity of the 
[ other Globe B^ the force, with which the Globe A 
moves, is to the force, with which the Globe B moves, 
as the Velocity of this Globed, to the Velocity of the 
other Globe A. 13ut if the fame Oppofition be made 
i) to the' Motion of the Globes, when they bear upon 
; equal Portions of the yielding Subfiance, the Effedf of 
that Oppofition, while the Globes enter farther into the 
Subfiance by equal Spaces, will be proportional to the 
^ time, in which the Globes are moving thofe Spaces, 
or in which the Oppofition is made, if we confider 
thofe Spaces while nafcenc or in their firfl Origine; 
the Effcd: therefore of this Oppofition will be recipro- 
cally proportional to the Velocity of each Globe** 
I -namely, the momentaneous lofs of force in the Globe 
! . N z A 
I 
