Exit Check 4.3 - Conservation of Momentum
Authored by Scott Ness
Physics
9th Grade
NGSS covered
Used 13+ times
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10 questions
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1.
MATCH QUESTION
5 mins • 1 pt
4.3.1
Use the picture to identify the momenta of both objects. Then match the information below with correct descriptions.
Momentum of the larger ball before collision
Total momentum before collision
Momentum of the smaller ball before collision
Answer explanation
We have not yet learned to calculate momentum using the yellow sheet, so instead focus on using your understanding of the law of conservation of momentum. Once you find the total momentum at any point in the system, you know it must stay the same at all other points. That is what is means when we say "momentum is conserved".
Look carefully at the problem to identify what objects are moving, and in what direction. Once you find the total system momentum, figuring out individual values becomes a matter of simple addition or subtraction.
Tags
NGSS.HS-PS2-2
2.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
4.3.1
Oliver is working on his momentum lab. He has calculated that the total momentum in his system is 0.15 kg⋅m/s after the collision. If the second ball was not moving before the collision what was the momentum of the first ball before the collision?
0.15 kg⋅m/s
- 0.30 kg⋅m/s
0.85 kg⋅m/s
0.00 kg⋅m/s
Answer explanation
We have not yet learned to calculate momentum using the yellow sheet, so instead focus on using your understanding of the law of conservation of momentum. Once you find the total momentum at any point in the system, you know it must stay the same at all other points. That is what is means when we say "momentum is conserved".
Look carefully at the problem to identify what objects are moving, and in what direction. Once you find the total system momentum, figuring out individual values becomes a matter of simple addition or subtraction.
Tags
NGSS.HS-PS2-2
3.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
4.3.1
A toy truck moves East with a momentum of 50 kg⋅m/s. It collides toy car moving West with a momentum of 50 kg⋅m/s. What is the total momentum of the system?
0 kg·m/s
30 kg·m/s
50 kg·m/s
10 kg·m/s
Answer explanation
We have not yet learned to calculate momentum using the yellow sheet, so instead focus on using your understanding of the law of conservation of momentum. Once you find the total momentum at any point in the system, you know it must stay the same at all other points. That is what is means when we say "momentum is conserved".
Look carefully at the problem to identify what objects are moving, and in what direction. Once you find the total system momentum, figuring out individual values becomes a matter of simple addition or subtraction.
Tags
NGSS.HS-PS2-2
4.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
4.3.2
Two skaters begin at rest. After they push off each other,...
Skater 1 experiences a greater change in momentum
Skater 2 experiences a greater change in momentum
Both skaters have equal and opposite momenta
This is impossible, if they weren't moving they cannot start moving.
Answer explanation
We looked at examples of elastic collisions, inelastic collisions, and explosions in class. Some scenarios involved one object at rest, others had both objects moving.
Start by calculating or identifying the momentum of each object before the collision. Then apply your understanding that total momentum is conserved. Use this to predict how momentum is shared or transferred between objects after the collision.
Pay close attention to the type of collision:
In elastic collisions, objects bounce and momentum is conserved and transferred between the objects.
In inelastic collisions, objects may stick together and momentum is conserved and shared across the new larger object.
In explosions (push away), one object splits into two or more pieces, but total momentum still remains constant.
Tags
NGSS.HS-PS2-2
5.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
4.3.2
A person on a stationary skateboard throws a bowling ball so that it has a new momentum of -50 kg⋅m/s. What is the momentum of the person after the throw?
0 kg⋅m/s
50 kg⋅m/s
-50 kg⋅m/s
75 kg⋅m/s
Answer explanation
This question links to success criteria 4.3.2: I can use conservation of momentum to predict the outcomes of various types of collisions.
If you got it correct place a check mark in the question results section. If you got it incorrect place an X in that section. If this was a redemption question, cross out the one X and replace it with a check mark.
Tags
NGSS.HS-PS2-2
6.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
4.3.2
Two identical bowling balls are thrown so that they each have a momentum of 5 kg⋅m/s. Ball 1 collides with stationary pin 1, and pin 1 has a momentum of 1 kg⋅m/s after the collision. Ball 2 collides with stationary pin 2, and pin 2 has a momentum of 3 kg⋅m/s after the collision. Which of the following is true?
After the collisions both balls stop moving.
After the collision both balls have equal momentum
After the collision Ball 2 has more momentum than Ball 1
After the collision, Ball 1 has more momentum than Ball 2
Answer explanation
We looked at examples of elastic collisions, inelastic collisions, and explosions in class. Some scenarios involved one object at rest, others had both objects moving.
Start by calculating or identifying the momentum of each object before the collision. Then apply your understanding that total momentum is conserved. Use this to predict how momentum is shared or transferred between objects after the collision.
Pay close attention to the type of collision:
In elastic collisions, objects bounce and momentum is conserved and transferred between the objects.
In inelastic collisions, objects may stick together and momentum is conserved and shared across the new larger object.
In explosions (push away), one object splits into two or more pieces, but total momentum still remains constant.
Tags
NGSS.HS-PS2-2
7.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
4.3.2
Two football players are running towards each other. Player A has a momentum of 150 kg⋅m/s. Player B has a momentum of -187.5 kg⋅m/s. Which of the following best describes their motion after they collide.
They do cancel each other out and stop moving.
They do cancel each other out and both bounce off, reversing direction
They don't cancel each other out and move in the negative direction.
They don't cancel each other out and move in the positive direction
Answer explanation
We looked at examples of elastic collisions, inelastic collisions, and explosions in class. Some scenarios involved one object at rest, others had both objects moving.
Start by calculating or identifying the momentum of each object before the collision. Then apply your understanding that total momentum is conserved. Use this to predict how momentum is shared or transferred between objects after the collision.
Pay close attention to the type of collision:
In elastic collisions, objects bounce and momentum is conserved and transferred between the objects.
In inelastic collisions, objects may stick together and momentum is conserved and shared across the new larger object.
In explosions (push away), one object splits into two or more pieces, but total momentum still remains constant.
Tags
NGSS.HS-PS2-2
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