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Q2.2.a
An object is moving in the +x direction.
1) A only
Which of the following statements about the 2) B only
net force acting on the object could be true? 3) C only
4) A and B
A. The net force is in the +x direction
5) B and C
B. The net force is in the –x direction
6) A and C
C. The net force is zero
7) A, B, and C
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Q2.2.b
Cart A moves to the left at nearly
constant speed.
Cart B moves to the left, gradually
speeding up.
Cart C moves to the left, gradually
slowing down.
Which cart(s) experience a net
force to the left?
1) A only
2) B only
3) C only
4) A and B
5) B and C
6) A and C
7) A, B, and C
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Q2.3.a:
The x-component of momentum
of an object is found to increase
with time:
t = 0 s px = 30 kg m/s
t = 1 s px = 40 kg m/s
t = 2 s px = 50 kg m/s
t = 3 s px = 60 kg m/s
What can you conclude about the xcomponent of the net force acting on
the object?
1) Fnet,x = 0
2) Fnet,x is constant
3) Fnet,x is increasing with time
4) Not enough information is given to
determine which is true.
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Q2.3.b
A hockey puck is sliding along the ice
with nearly constant momentum
< 10, 0, 5 > kg m/s when it is suddenly
struck by a hockey stick with a force
< 0, 0, 2000 > N that lasts for only
3 milliseconds (3e-3 s).
What is the new (vector) momentum of
1) < 10, 0, 11 > kg· m/s
2) < 0, 0, 6 > kg· m/s
3) 14.86 kg· m/s
4) < 16, 0, 11 > kg· m/s
5) < 0, 0, 30 > kg· m/s
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the puck?
Q2.3.c:
You push a book across a table.
In order to keep the book moving
with constant momentum, you
have to keep pushing with a
constant force.
Which statement explains this?
1) A net force is necessary to keep an
object moving.
2) To make the net force on the book
zero, you must push with a force
equal and opposite to the friction
force on the book.
3) The force you exert must be
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slightly larger than the friction force.
Q2.3.d:
Inside a spaceship in outer space there
is a small steel ball. At a particular
instant, the ball has momentum < -8, 3, 0
> kg· m/s and is pulled by a string, which
exerts a force < 20, -10, 0 > N on the ball.
What is the ball’s (vector) momentum 2
1) < -28, 23, 0 > kg· m/s
2) < 12, -7, 0 > kg· m/s
3) 36.2 kg· m/s
4) < 32, -17, 0 > kg· m/s
5) < 40, -20, 0 > kg· m/s
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seconds later?
Q2.5.a:
A ball is initially on the ground, and you
kick it with initial velocity < 3,7,0> m/s.
At this speed air resistance is negligible.
Assume the usual coordinate system.
1) px
2) py
3) pz
4) px & py
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Which components of the ball's
momentum will change in the next half
second?
5) py & pz
5) pz & px
7) px, py, & pz
Q2.5.b:
The mass of the ball is 500 g, and its
1) < 0, 2.45, 0 > N*s
initial velocity is < 3,7,0> m/s. What is the 2) < 0, –2.45, 0 > N*s
net impulse acting on the ball during the 3) < 0, 9.8, 0 > N*s
next 0.5 seconds after you kicked it?
4) < 0, –9.8, 0 > N*s
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5) < 0, 4.9, 0 > N*s
6) < 0, –4.9, 0 > N*s
The initial momentum of the ball was < 1.5, 3.5, 0 > kg*m/s.
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The final momentum of the ball is < 1.5, 1.05, 0 > kg*m/s.
Therefore...
Q2.5.c: Which graph correctly shows py for the ball during this 0.5 s?
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1
2
3
4
Q2.5.d:
5
6
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Initially the velocity of the ball is
< 3 , 7 ,0 > m/s. After 0.5 s, the ball's
velocity is < 3, 2.1, 0 > m/s.
What is the best choice for the ycomponent of the ball's average velocity
during this interval?
1) 2.10 m/s
2) 4.55 m/s
3) 4.90 m/s
4) 7.00 m/s
5) 9.10 m/s
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Q2.6.a
A student is running very fast.
What is the student’s
approximate speed? (Think
about what you know about
track and field events.)
1) 0.1 m/s
2) 1 m/s
3) 10 m/s
4) 100 m/s
5) 1000 m/s
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Q2.6.b Two running students collide head-on
One student exerts a force of
magnitude F on the other student.
Suppose we choose BOTH students as
the “system” to which to apply the
momentum principle. What is the net
force acting on this system?
1) < F, 0, 0 >
2) < 2F, 0, 0 >
3) < 0, 0, 0 >
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Q2.6.c
Approximately what is the time interval t
from just before the students make contact
to just after?
1) 0.001 s
2) 0.01 s
3) 0.1 s
4) 1 s
5) 10 s
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Q2.9.a
When a ping pong ball collides
with a bowling ball, why is the
effect on the ping pong ball
more noticeable than the effect
on the bowling ball?
1) The momentum of the bowling ball does
not change.
2) The change in the bowling ball’s
momentum is less than the change in the
ping pong ball’s momentum.
3) The change in the bowling ball’s
velocity is less than the change in the ping
pong ball’s velocity.
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Q2.9.b
A bowling ball is initially at rest. A ping
pong ball moving in the +z direction hits
the bowling ball, and bounces off it,
traveling back in the –z direction.
Consider a time interval t from slightly
In this time interval, what is the
sign of pz for the system
consisting of both balls?
1) positive
2) negative
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before to slightly after the collision.
Q2.9.c
A bullet of mass m traveling horizontally
at a very high speed v
embeds itself in a block of mass M
that is sitting at rest on a very slippery
sheet of ice.
You want to find the speed of the block
3) zero – no change in pz
What should you choose as the
system?
1) the bullet
2) the block
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just after the bullet embeds itself in the
block.
3) the bullet and the block
Q2.9.d: A bullet of mass m traveling
horizontally at a very high speed v
embeds itself in a block of mass M
that is sitting at rest on a very slippery
sheet of ice.
1) v
What is the speed of the block just after
the bullet embeds itself in the block?
m
v
M m
 M  m
3) 
v
 m 
2)
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m
v
M 
m 

5) 
v
 M  m
4) 
Q2.9.e:
A space satellite of mass 500 kg has
velocity < 12, 0, –8 > m/s just before
being struck by a rock of mass 3 kg with
velocity < –3000, 0, 900 > m/s.
1) < –5100, 0, –400 > m/s
2) < –10.2, 0, –0.8 > m/s
3) < 10.2, 0, 0.8 > m/s
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After the collision the rock’s velocity is
< 700, 0, –300 > m/s. Now what is the
velocity of the space satellite?
4) < –3688, 0, 1191 > m/s
5) < 3688, 0, –1192 > m/s