A "Newton's cradle" is a common desk toy that is composed of 5 identical metal balls of mass m hanging from ideal strings of length L. The balls have a very small spacing between them. The first ball is lifted by 90° and then released from rest. All of the collisions between the balls are elastic. Figure 5: Image of a Newton's cradle (a) What is the speed of the first ball immediately before it collides with the second ball? (b) Immediately after the first ball collides with the second, what are the velocities of the two balls? (c) After this collision, ball 2 goes on to collide with ball 3, 3 with 4, and then 4 with 5. What is the velocity of ball 5 just after this final collision?

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QuestionR.4.
A "Newton's cradle" is a common desk toy that is composed of 5 identical
metal balls of mass m hanging from ideal strings of length L. The balls have
a very small spacing between them. The first ball is lifted by 90° and then
released from rest. All of the collisions between the balls are elastic.
Figure 5: Image of a Newton's cradle
(a) What is the speed of the first ball immediately before it collides with
the second ball?
(b) Immediately after the first ball collides with the second, what are the
velocities of the two balls?
(c) After this collision, ball 2 goes on to collide with ball 3, 3 with 4,
and then 4 with 5. What is the velocity of ball 5 just after this final
collision?
(d) The fifth ball then swings freely to the right to some maximum height.
What is this maximum height?
Transcribed Image Text:QuestionR.4. A "Newton's cradle" is a common desk toy that is composed of 5 identical metal balls of mass m hanging from ideal strings of length L. The balls have a very small spacing between them. The first ball is lifted by 90° and then released from rest. All of the collisions between the balls are elastic. Figure 5: Image of a Newton's cradle (a) What is the speed of the first ball immediately before it collides with the second ball? (b) Immediately after the first ball collides with the second, what are the velocities of the two balls? (c) After this collision, ball 2 goes on to collide with ball 3, 3 with 4, and then 4 with 5. What is the velocity of ball 5 just after this final collision? (d) The fifth ball then swings freely to the right to some maximum height. What is this maximum height?
4) a)
Ein =Ef
%3D
v= 1ZgL
V =
2gh
6) 1D elastic
collision
init. vel.
final vel.
V, , Vz
Uz
M, , M2
M,- My
V, +
Vz
M,V, + Mq Uz c M, U,+MqUq
Myt M2
%3D
V.
M, = M
,E M
U, =0
%3D
c)
v, = U.
U, = 0
Vg =0 SUg=U
V5 =U
E, - Ein
%3D
%3D
mgh {mp?
Transcribed Image Text:4) a) Ein =Ef %3D v= 1ZgL V = 2gh 6) 1D elastic collision init. vel. final vel. V, , Vz Uz M, , M2 M,- My V, + Vz M,V, + Mq Uz c M, U,+MqUq Myt M2 %3D V. M, = M ,E M U, =0 %3D c) v, = U. U, = 0 Vg =0 SUg=U V5 =U E, - Ein %3D %3D mgh {mp?
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