AnswersMO-Physical Science A-CRLab: Motion

Lab: Motion — Unit test Answers

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The table represents the speed of a car in a northern direction over several seconds.

Question illustration
A
Column 1 should be titled “Time,” and Column 2 should be titled “Velocity.”
B
Column 1 should be titled “Velocity,” and Column 2 should be titled “Time.”
C
Column 1 should be titled “Time,” and Column 2 should be titled “Acceleration.”
D
Column 1 should be titled “Acceleration,” and Column 2 should be titled “Time.”
2
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What kind of acceleration occurs when an object speeds up?

A
positive
B
negative
C
neutral
D
zero
3

Two objects collide and bounce apart. Assuming no outside forces act on the system, which best describes the total momentum after the collision?

A
It is always greater than it was before the collision.
B
It is often greater than it was before the collision.
C
It is always the same as it was before the collision.
D
It is often the same as it was before the collision.
4

Levi and Clara are trying to move a very heavy box. Levi is pushing the box with a force of 30 N, and Clara is pulling the box with a force of 50 N. The box exerts a frictional force of 65 N.

A
There is a net force of 15 N against them and they cannot move the box.
B
There is a net force of 15 N allowing Levi and Clara to move the box.
C
There is a net force of 65 N against them and they cannot move the box.
D
There is a net force of 80 N allowing Levi and Clara to move the box.
5

In a car, how does an air bag minimize the force acting on a person during a collision?

A
It increases the change in momentum of the person.
B
It decreases the change in momentum of the person.
C
It increases the time it takes for the person to stop.
D
It decreases the time it takes for the person to stop.
6

Xander reached a final velocity of 4.5 m/s in 3.5 seconds. Finley reached a final velocity of 3.6 m/s in 4.2 seconds. Max reached a final velocity of 7.3 m/s in 1.2 seconds. They all started at the same location from rest.

A
Max Finley Xander
Option A
B
Max Xander Finley
Option B
C
Xander Finley Max
Option C
D
Finley Xander Max
Option D
7

The graph represents velocity vs. time for Carla.

Question illustration
A
Carla sped up in the beginning of her trip, stopped, and then slowed down.
B
Carla had a greater acceleration in the beginning than in the end.
C
Carla slowed down in the beginning of her trip, stopped, and then sped up.
D
Carla had a continuous acceleration throughout the entire trip.
8

The diagram shows Ned’s movement as he left his house and traveled to different places throughout the day.Which reference point should be used to find out how far Ned traveled when he went from the pet store to the swimming pool?

Question illustration
A
V
B
W
C
X
D
Z
9

What must be included when describing the displacement of an object?

A
measurement and direction
B
direction and speed
C
total distance and position
D
speed and total distance
10

Sayid made a chart listing data of two colliding objects.According to the law of conservation of momentum, what is the missing value in the chart?

Question illustration
A
4
B
6
C
10
D
16
11

What is determined by calculating the slope of the position vs time graph?

A
position
B
velocity
C
distance
D
displacement
12

A football player has a mass of 65 kg and is moving with a velocity of 5 m/s. What is the player’s momentum?

A
13 kg • m/s
B
70 kg • m/s
C
305 kg • m/s
D
325 kg • m/s
13

Koto traveled 5,000 meters north from her house with an average velocity of 4.5 m/s.What was the time of her trip? (There are 60 seconds in 1 minute.)

A
18.5 minutes
B
20.4 minutes
C
2 hours
D
3 hours
14

A tugboat is pulling a barge into a harbor. The barge is exerting a force of 3000 N against the tugboat.Which force would most likely allow the tugboat to move the barge into the harbor?

A
4500 N in the opposite direction of the barge
B
3000 N in the opposite direction of the barge
C
3000 N in the same direction of the barge
D
4500 N in the same direction of the barge
15

Tyler and his family drove from Atlanta to Baltimore. They traveled a total of 678 miles over 2 days.What is the reference point in this scenario?

A
Atlanta
B
Baltimore
C
678 miles
D
2 days

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