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Momentum — Unit test Answers

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The chart shows masses and velocities of four objects.

Question illustration
A
W, X, Y, Z
B
Z, Y, X, W
C
Z, X, W, Y
D
Y, W, X, Z
2
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Denise is riding her bike and falls to the ground. During the collision, she hits both grass and cement.

A
The grass did not exert a reaction force.
B
The grass did not exert an action force.
C
The grass shortens the time of the collision.
D
The grass extends the time of the collision.
3

Football helmets are made with padding that helps reduce head injuries when a player collides with an object. Which best explains how the padding reduces injuries?

A
It extends the time of the collision.
B
It reduces the time of the collision.
C
It eliminates the reaction force of the object.
D
It eliminates the action force of the object.
4

Two carts collide and bounce apart. Cart 1 had a momentum of –6 kg • m/s before the collision. Cart 2 had a momentum of 10 kg • m/s before the collision.

A
–16 kg • m/s
B
–10 kg • m/s
C
4 kg • m/s
D
10 kg • m/s
5

According to Newton’s third law of motion, which are equal?

A
momentum and velocity
B
collision time and stop time
C
mass and momentum
D
action force and reaction force
6

A bowling ball collides with a pin and pushes the pin toward the right. Which describes the reaction force?

A
The pin pushes the bowling ball toward the right.
B
The pin pushes the bowling ball toward the left.
C
The bowling ball pulls the pin toward the right.
D
The bowling ball pulls the pin toward the left.
7

The diagram shows two balls before they collide.

Question illustration
A
0.0 kg • m/s
B
0.2 kg • m/s
C
0.3 kg • m/s
D
0.4 kg • m/s
8

The chart lists the masses of four balls that have the same momentum.

Question illustration
A
The green ball has a lower velocity than the purple ball.
B
The red ball has a greater velocity than the purple ball.
C
The yellow ball has a higher velocity than the green ball.
D
The red ball has a greater velocity than the green ball.
9

The law of conservation of momentum states that, if left alone, what happens to the total momentum of two interacting objects that make up a system?

A
it increases over time
B
it remains the same
C
it eventually becomes zero
D
changes based on how they collide
10

Sheila weighs 60 kg and is riding a bike. Her momentum on the bike is 340 kg • m/s. The bike hits a rock, which stops it completely and throws Sheila forward onto the pavement.If there is no net force on the system, what is Sheila’s velocity immediately after she is thrown from the bike?

A
1.8 m/s
B
2.0 m/s
C
5.0 m/s
D
5.7 m/s
11

What does it mean if a group is nonpartisan?

A
It is not operating in the United States.
B
It is not breaking federal law.
C
It is not supported by donors.
D
It is not part of a political party.
12

Barack Obama was the first candidate to fully use social media during his run for the presidency. It allowed him to reach the public in a more direct way. Why would this be helpful to candidates?

A
It would prevent mass media from fulfilling the role of watchdog.
B
It would help candidates avoid the gatekeeping function in mass media.
C
It would prevent the media from selecting stories and setting political agendas.
D
It would help candidates block reporters from criticizing their campaigns.
13

Why might an interest group form a super PAC instead of a PAC?

A
to spend unlimited amounts of money on political ads
B
to contribute more money to a political campaign
C
to endorse a specific candidate running for political office
D
to make political funding transparent
14

What did the Indigenous protesters against the construction of a telescope on Mauna Kea in 2020 and at Six Grandfathers Mountain in 1970 have in common?

A
They were successful in influencing legislation related to Indigenous concerns.
B
They hoped to extend voting rights to Indigenous groups.
C
They wanted to protect land important to Indigenous people.
D
They raised awareness about the importance of educating Indigenous children.
15

Read the scenario.A media group is creating a podcast on vaccine safety. They have a list of medical doctors and vaccine researchers they can interview for the podcast. Most people on the list support vaccines and consider them safe and effective. A few doctors on the list are cautious about vaccine overuse, and two doctors are known to be against vaccinating children. The media group decides to interview the two doctors who oppose vaccinating children. The finished podcast is supportive of the doctors’ views.

A
The media group is monitoring events and activities.
B
The media group is choosing which sources are used.
C
The media group is exposing questionable actions.
D
The media group is acting as the “fourth branch of government.”
16

Eighth graders Sienna and Jamal are working on a plan to help people experiencing homelessness in their community. They have talked with people in the community to gather the information they need to create a proposal. Now they want to talk to local government officials. What would be the most likely reason to take this step?

A
to find out what’s already been done about homelessness in their community
B
to research the history of homelessness in their community in the past 20 years
C
to learn who to contact in the federal government about their community proposal
D
to figure out how much participation they can expect from other community members
17

What is the definition of social inequality?

A
an uncomfortable situation in which two or more friends are having an argument
B
a dangerous situation in which different groups of people are fighting with one another
C
an unfair situation in which some groups have less money, power, or status than others
D
a political situation in which two or more countries are involved in a dispute over borders
18

Which right was extended to Indigenous people through the Indian Civil Rights Act of 1968?

A
the right to live on tribal lands
B
the right to vote
C
the right to trial by jury
D
the right to be counted as citizens
19

Read the scenario and study the image.An environmental interest group has launched peaceful protests and a social media campaign against single-use plastics. They are using the slogan "World of plastic is not fantastic” to promote their viewpoint.

Question illustration
A
It disregards any positive uses of plastic.
B
It supports the use of only some kinds of plastic.
C
It opposes companies profiting from making plastic.
D
It encourages people to use glass instead of plastic.
20

What kind of an advocacy group might focus on helping people who are experiencing homelessness?

A
a PAC
B
a 527
C
a nonprofit organization
D
a for-profit business

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