CP Workbook
Momentum Systems and Conservation
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When the compressed spring is released, blocks A and B will slide apart.
There are 3 systems to consider here, indicated by the closed dashed lines below: System A, System B, and System A+B. Ignore the vertical forces of gravity and the support force of the table.
Does an external force act on System A?
yes
no
Will the momentum of System A change?
yes
no
Does an external force act on System B?
yes
no
Will the momentum of System B change?
yes
no
Does an external force act on System A+B?
yes
no
Will the momentum of System A+B change?
yes
no
Billiard ball A collides with billiard ball B at rest.
Show your partner where you would place a closed dashed line to isolate each system. Then discuss what, if any, external force vectors act on each system.
Upon collision, the momentum of System A.
increases
decreases
remains unchanged
Upon collision, the momentum of System B.
increases
decreases
remains unchanged
Upon collision, the momentum of System A+B.
increases
decreases
remains unchanged
A girl jumps upward.
Show your partner where you would place a closed dashed line on the sketch given below to indicate the system of the "girl." Then discuss what, if any, external force vectors act on the system of the "girl."
Is there an external force acting on her?
yes
no
Is the girl's momentum conserved?
yes
no
Now show your partner where you would place a closed dashed line on the sketch below to indicate the system of the "girl + earth."
Is there an external force due to the interaction between the girl and the earth that acts on the system?
yes
no
Is the momentum of the system conserved?
yes
no
A block strikes a blob of jelly.
Show your partner where you would place closed dashed lines to isolate three systems. Then discuss what, if any, external force vectors act on each system.
In which system is momentum conserved?
Block
Jelly
Block and Jelly
A truck crashes into a wall.
Show your partner where you would place closed dashed lines to isolate three systems. Then discuss what, if any, external force vectors act on each system.
In which system is momentum conserved?
Truck
Wall
Truck and Wall
Related Documents
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A Photoelectric Effect Analogy
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Air Track Collisions
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Ballistic Pendulum
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Conservation of Momentum
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Impulse
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Inelastic Collision - Velocity of a Softball
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Resource Lesson:
RL -
A Further Look at Impulse
RL -
Famous Discoveries: The Franck-Hertz Experiment
RL -
Linear Momentum
RL -
Momentum and Energy
RL -
Springs and Blocks
RL -
Symmetries in Physics
Worksheet:
APP -
Puppy Love
APP -
The Jogger
APP -
The Pool Game
APP -
The Raft
CP -
Conservation of Momentum
CP -
Momentum
CP -
Momentum and Energy
CP -
Momentum and Kinetic Energy
CP -
Momentum Practice Problems
NT -
Ice Boat
NT -
Momentum
WS -
Advanced Properties of Freely Falling Bodies #1
WS -
Advanced Properties of Freely Falling Bodies #2
WS -
Advanced Properties of Freely Falling Bodies #3
WS -
Charged Projectiles in Uniform Electric Fields
WS -
Force vs Displacement Graphs
WS -
Practice: Momentum and Energy #1
WS -
Practice: Momentum and Energy #2
Paul G. Hewitt
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