AnswersTN-Physical Science SC 26-27 For CreditLab: Newton's Laws of Motion

Lab: Newton's Laws of Motion — Unit test Answers

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1
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Based on the tug of war pictured below, what is the net force?

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A
–190 N
B
10 N
C
–10 N
D
190 N
2
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Engineers are trying to improve a race car. Their goal is to increase the acceleration of the car using the same engine. Which change shows the best application of Newton’s laws of motion to achieve this goal?

A
increasing the inertia of the car
B
decreasing the reaction force
C
increasing the action force
D
decreasing the mass of the car
3

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
4

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.
5

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
6

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
7

The graph represents velocity vs. time for Carla.

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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

Which best describes a force?

A
a vector with magnitude and direction
B
a vector with speed and strength
C
a vector with direction only
D
a vector with strength only
9

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
10

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

A
position
B
velocity
C
distance
D
displacement
11

Kai was 200 meters north of the library when he remembered he had to return some books to the library. It took him 200 seconds to do the round trip.Which best describes Kai’s roundtrip?

A
His speed was 1 m/s, and his velocity was 0.
B
His speed was 2 m/s, and his velocity was 0.
C
His speed was 1 m/s, and his velocity was 1 m/s north.
D
His speed was 2 m/s, and his velocity was 2 m/s south.
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

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.

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