MOVING FORCB. 
(35 
A, the ends of the spring will not be brought to meet b 7 the teases of diih- 
. ^ ■ t 11 I L L I 1 II ciiltv m the 
action of the balls. In (hat case, when the b.^lls are at rest, doctYiiieit i f 
the distance between the ends of the spring will be to CD, as force. 
1.1 to 6 nearly. 
/. If a non-elastic mass, A, (fig. 7-) moving with a given 
velocity, strike an equal non-elastic mass, B, at rest in free 
spaccj both balls will move on together, with half the velocity of 
A. Upon the principle of the moving forces being as the quan- 
tities of motion, and the quantities of motion as the masses into 
their velocities; it is held that the moving force of A is equal 
to that of A and B, moving together with half the original 
velocity of A. 
If the ball R, have a spring attached to it, furnished with a 
toothed catch C, to retain the spring in the form to which it may 
be compressed ; it will then represent a perfectly non.elastic 
Dody. Let A strike the spring and compress it to E, and let 
A and B move on together, with half the original vehxiiiy of 
\. Let the spring be then removed in its compressed slate, 
nd placed between to other balls, C and D, equal in their 
nasses to A and B. and at rest in free space ; let the catch C, 
e then disengaged ; the spring will resume its original sh.ape, 
nd the balls, C and D, will each move off with half the ori- 
inal velocity of A ; and we shall then have three masses be- 
ides A, each equal to A, moving with half the original velo- 
ily of A, and all of them deriving their motion fro.Ti the ori- 
inal force of A. 
8. Let A (fig. 8.) be a non-elastic soft mass, uniformly pene*» 
able by the cylinder C; that is, the tenacity of the parts of A 
lall be such, that c shall meet with the same resistance at 
very point of its progress. Let A move with tiie volocity v, in 
le direction A B, against an immovable obstacle, and be brought 
) rest by forcing the length E E of the cylinder into the ball. 
'hat penetration of c is, in this instance, the whole effect pro» 
.iced by the force of the motion of A. Let the operation be 
ipeated, hut instead of an immoveable obstacle, let B be a 
lass equ.ll to A, in free space, but not penetrable by c: then 
le cylinder ^ill be forced into A a depth equal only to E F, 
VoL. XXXIV. No. 165. F aud 
