Ch9

1
Chapter 9
2
The carts change of momentum is
1. 30 kg m/s. 2. 20 kg m/s. 3. 10 kg m/s. 4.
10 kg m/s. 5. 30 kg m/s.
3
The carts change of momentum is
1. 30 kg m/s. 2. 20 kg m/s. 3. 10 kg m/s. 4.
10 kg m/s. 5. 30 kg m/s.
4
A 10 g rubber ball and a 10 g clay ball are
thrown at a wall with equal speeds. The rubber
ball bounces, the clay ball sticks. Which ball
exerts a larger impulse on the wall?
1. The clay ball exerts a larger impulse because
it sticks. 2. The rubber ball exerts a larger
impulse because it bounces. 3. They exert equal
impulses because they have equal momenta. 4.
Neither exerts an impulse on the wall because the
wall doesnt move.
5
A 10 g rubber ball and a 10 g clay ball are
thrown at a wall with equal speeds. The rubber
ball bounces, the clay ball sticks. Which ball
exerts a larger impulse on the wall?
1. The clay ball exerts a larger impulse because
it sticks. 2. The rubber ball exerts a larger
impulse because it bounces. 3. They exert equal
impulses because they have equal momenta. 4.
Neither exerts an impulse on the wall because the
wall doesnt move.
6
Objects A and C are made of different materials,
with different springiness, but they have the
same mass and are initially at rest. When ball B
collides with object A, the ball ends up at rest.
When ball B is thrown with the same speed and
collides with object C, the ball rebounds to the
left. Compare the velocities of A and C after the
collisions. Is vA greater than, equal to, or less
than vC?
1. vA gt vC 2. vA vC 3. vA lt vC
7
Objects A and C are made of different materials,
with different springiness, but they have the
same mass and are initially at rest. When ball B
collides with object A, the ball ends up at rest.
When ball B is thrown with the same speed and
collides with object C, the ball rebounds to the
left. Compare the velocities of A and C after the
collisions. Is vA greater than, equal to, or less
than vC?
1. vA gt vC 2. vA vC 3. vA lt vC
8
An explosion in a rigid pipe shoots out three
pieces. A 6 g piece comes out the right end. A 4
g piece comes out the left end with twice the
speed of the 6 g piece. From which end does the
third piece emerge?
1. Left end 2. Right end
9
An explosion in a rigid pipe shoots out three
pieces. A 6 g piece comes out the right end. A 4
g piece comes out the left end with twice the
speed of the 6 g piece. From which end does the
third piece emerge?
1. Left end 2. Right end
10
The two particles are both moving to the right.
Particle 1 catches up with particle 2 and
collides with it. The particles stick together
and continue on with velocity vf. Which of these
statements is true?
1. vf is greater than v1. 2. vf v1. 3. vf
is less than v2. 4. vf v2. 5. vf is greater
than v2, but less than v1.
11
The two particles are both moving to the right.
Particle 1 catches up with particle 2 and
collides with it. The particles stick together
and continue on with velocity vf. Which of these
statements is true?
1. vf is greater than v1. 2. vf v1. 3. vf
is less than v2. 4. vf v2. 5. vf is greater
than v2, but less than v1.
12
A dry ice (solid carbon dioxide) puck revolves in
a circle on the end of a lightweight rigid rod
that turns on frictionless bearings. A cushion of
CO2 gas allows the puck to glide across the
surface without friction. As the puck sublimates
(changes from a solid to a gas), its speed
1. increases. 2. decreases. 3. stays the same.
13
A dry ice (solid carbon dioxide) puck revolves in
a circle on the end of a lightweight rigid rod
that turns on frictionless bearings. A cushion of
CO2 gas allows the puck to glide across the
surface without friction. As the puck sublimates
(changes from a solid to a gas), its speed
1. increases. 2. decreases. 3. stays the same.
14
Chapter 9 Reading Quiz
15
Impulse is
1. a force that is applied at a random time. 2. a
force that is applied very suddenly. 3. the area
under the force curve in a force-versus-time
graph. 4. the time interval that a force lasts.
16
Impulse is
1. a force that is applied at a random time. 2. a
force that is applied very suddenly. 3. the area
under the force curve in a force-versus-time
graph. 4. the time interval that a force lasts.
17
The total momentum of a system is conserved 1.
always. 2. if the system is isolated. 3. if the
forces are conservative. 4. never its just an
approximation.
18
The total momentum of a system is conserved 1.
always. 2. if the system is isolated. 3. if the
forces are conservative. 4. never its just an
approximation.
19
In an inelastic collision, 1. impulse is
conserved. 2. momentum is conserved. 3. force
is conserved. 4. energy is conserved. 5.
elasticity is conserved.
20
In an inelastic collision, 1. impulse is
conserved. 2. momentum is conserved. 3. force
is conserved. 4. energy is conserved. 5.
elasticity is conserved.