AnswersHSPHY Physics Sem 1 26-27Lab: Conservation of Linear Momentum

Lab: Conservation of Linear Momentum Answers

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In all trials, the magnitude of the final velocity for G1 + G2 was less than the magnitude of any initial velocity. As mass increased, what happened to the velocity?

A
The velocity decreased.
B
The velocity increased.
C
The velocity of G1 + G2 could not be measured.
D
The velocity was not affected by the mass increase.
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Cart 1 has an initial velocity and hits Cart 2 which is stationary. After a perfectly inelastic collision, the combined carts are traveling with exactly one third the initial velocity of Cart 1, and in the same direction. Which is correct about the mass of Cart 2?

A
The mass of Cart 2 must be twice the mass of Cart 1.
B
The mass of Cart 2 must have decreased during the collision.
C
The mass of Cart 2 must be one third the mass of Cart 1.
D
The mass of Cart 2 must be the same as the mass of Cart 1.
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The simulation kept track of the variables and automatically recorded data on object displacement, velocity, and momentum. If the trials were run on a real track with real gliders, using stopwatches and meter sticks for measurement, how might the data compare? Check all that apply.

A
There would be variables that would be hard to control, leading to less reliable data.
B
The data would be just as valid if it were recorded with a stopwatch.
C
Meter sticks may lack precision or may be read incorrectly.
D
Real glider data may vary since real collisions may involve loss of energy.
E
Human error in recording or plotting the data could be a factor.
F
Controlling real glider velocities by hand would be just as accurate as simulation controls.
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In all trials, the magnitude of the final velocity for G1 + G2 was less than the magnitude of any initial velocity. As mass increased, what happened to the velocity?

A
The velocity decreased.
B
The velocity increased.
C
The velocity of G1 + G2 could not be measured.
D
The velocity was not affected by the mass increase.
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Read the scenario and choose the correct answers.

Answers:
Before the collision, snowball A was 7 kg and had initial momentum of –14 kg · m/s; therefore, its velocity must have been m/s.:–2
Snowball B had initial momentum of 15 kg ∙ m/s, and a velocity of 5 m/s; therefore, its mass must have been kg.:3
Recognizing that momentum is conserved in inelastic collisions, the total momentum of the combined snowballs after the collision must be kg · m/s.:1
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Cart 1 has an initial velocity and hits Cart 2 which is stationary. After a perfectly inelastic collision, the combined carts are traveling with exactly one third the initial velocity of Cart 1, and in the same direction. Which is correct about the mass of Cart 2?

A
The mass of Cart 2 must be twice the mass of Cart 1.
B
The mass of Cart 2 must have decreased during the collision.
C
The mass of Cart 2 must be one third the mass of Cart 1.
D
The mass of Cart 2 must be the same as the mass of Cart 1.
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10–2✔ 3

A
10
B
–2
C
✔ 3
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5✔ 13

A
5
B
✔ 1
C
3
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Consider the example data provided to complete the sentences.

Answers:
After colliding, G1 + G2 travels in a(n) direction as G1 travels before the collision, but at about the magnitude in velocity.:opposite
After colliding, G1 + G2 travels in a(n) direction as G1 travels before the collision, but at about the magnitude in velocity.:1/4
The initial momentum of G2 (the magnitude or absolute value) is greater than G1 because its is greater than G1.:mass
The percent difference between the total momentum before and after the collision is %.:0.0

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