AnswersEA Academy Civics 9Unit Test

Economics in Our Daily Lives Answers

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1
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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

Which piece of furniture will have the most inertia and give the furniture movers the most difficulty in moving?

A
a 50kg couch
B
a 5kg dining chair
C
a 75kg dining table
D
an 10kg end table
12

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.
13

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
14

Which describes an object’s speed when free falling in a vacuum?

A
The object accelerates until it reaches its terminal velocity.
B
The object falls at a constant speed because only one force acts on it.
C
The object falls faster and faster until it strikes the ground.
D
The object speeds up and then stops when air resistance equals gravity.
15

A scientist on Earth drops a hammer and a feather at the same time an astronaut on the moon drops a hammer and a feather.

A
The hammer hits the ground before the feather on both Earth and the moon.
B
The hammer hits the ground before the feather on Earth, but the feather hits the ground first on the moon.
C
The hammer and the feather hit the ground together on both Earth and the moon.
D
The hammer hits the ground before the feather on Earth, and the hammer and feather hit at the same time on the moon.
16

Review this social media post.

Question illustration
A
It adds the post to the larger conversation about pollution.
B
It helps users understand the intended purpose of the post.
C
It makes the post more exciting for users.
D
It is a required part of posting on social media.
17

What does the right to petition enable people to do?

A
advocate policy changes without punishment
B
decide whether to serve in the military
C
consume entertainment of their choice
D
gather as a group for religious services
18

What is a constituent?

A
a document describing a government
B
a resident in an electoral district
C
a government official
D
a rule everyone must follow
19

What was the result of the protests, beginning in 2016, on the Standing Rock Sioux Tribe’s reservation?

A
The residents of the reservation were forced to move elsewhere.
B
Protesters were given partial ownership of the oil company.
C
The US Congress forbade the oil company from building on the reservation.
D
Protestors raised awareness about reservation land rights.
20

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

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