AnswersWA-Physical Science BLab: Newton's Laws of Motion

Lab: Newton's Laws of Motion — Cumulative exam Answers

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1
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Based on the concept of the global conveyor belt, what happens to ocean water as it moves from Antarctica to the equator?

A
It transfers thermal energy to deeper layers of the ocean.
B
It becomes less dense and rises to the surface.
C
It transfers thermal energy to the area, warming the equatorial waters.
D
It becomes more dense and sinks to the ocean bottom.
2
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What is the kinetic energy of a toy truck with a mass of 0.75 kg and a velocity of 4 m/s? (Formula: )

Question illustration
A
3 J
B
6 J
C
12 J
D
24 J
3

Which most likely uses only alternating current?

A
A smartphone.
Option A
B
A digital wristwatch.
Option B
C
A magnetic compass.
Option C
D
A large flat screen television.
Option D
4

Gymnasts often practice on foam floors, which increase the collision time when a gymnast falls. What effect does this have on collisions?

A
The change in momentum needed to stop the gymnast is increased.
B
The change in momentum needed to stop the gymnast is decreased.
C
The force exerted by the floor on the gymnast decreases.
D
The force exerted by the floor on the gymnast increases.
5

Molecules in all organisms are composed in part of radioactive carbon-14. Which statement best explains the presence of carbon-14 in organisms?

A
The radioactive isotope reacts in the same way as stable isotopes in the nuclear reactions in the body.
B
The radioactive isotope reacts in the same way as stable isotopes in the chemical reactions in the body.
C
The radioactive isotope reacts faster than stable isotopes in the nuclear reactions in the body.
D
The radioactive isotope reacts faster than stable isotopes in the chemical reactions in the body.
6

Which type of electromagnetic waves make up the colors of a rainbow seen after a storm?

A
visible light
B
infrared light
C
X-rays
D
ultraviolet light
7

An atom bonds with another atom. What is the best classification for this reaction?

A
endothermic
B
chemical
C
nuclear
D
redox
8

Which of these actions would decrease heat transfer between two objects?

A
increasing the temperature of the warmer object
B
increasing the area of their contact
C
reducing the thermal energy of the cooler object
D
reducing the time of their contact
9

Which best explains why aluminum is a nonrenewable resource?

A
It cannot be quickly replaced.
B
It is expensive to process.
C
It conducts electricity.
D
It is useful to humans.
10

Kiley, Jermaine, and Gunther are playing tug-of-war. Kiley and Jermaine are on the same side of the rope, and Gunther is on the other side. Kiley is exerting a force of 20 N, and Jermaine is exerting a force of 25 N.

A
45 N in the opposite direction as Kiley and Jermaine
B
20 N in the opposite direction as Kiley and Jermaine
C
20 N in the same direction as Kiley and Jermaine
D
45 N in the same direction as Kiley and Jermaine
11

Jerimiah is studying Wave A and Wave B. Wave A is traveling at 3 hertz, and Wave B is traveling at 1.2 hertz.

A
Refraction would occur.
B
Interference would occur.
C
The resulting wave would travel at 4.2 hertz.
D
The crest of Wave A would overlap the trough of Wave B.
12

Which best compares radiation and conduction?

A
Both transfer thermal energy from warm objects to cooler objects.
B
Both can transfer energy through empty space.
C
Both transfer thermal energy by electromagnetic waves.
D
Both involve the transfer of energy through direct contact.
13

Which best explains why a black T-shirt gets warmer in the Sun than a white T-shirt?

A
Darker colors reflect more energy from colliding particles than lighter colors do.
B
Darker colors absorb more energy from colliding particles than lighter colors do.
C
Darker colors reflect more energy from electromagnetic waves than lighter colors do.
D
Darker colors absorb more energy from electromagnetic waves than lighter colors do.
14

Which types of electromagnetic waves have frequencies that are higher than those of ultraviolet light but lower than those of gamma rays?

A
microwaves
B
X-rays
C
infrared light
D
radio waves
15

Two objects are held close together. When they are released, they move toward one another. Which conclusion is supported by this evidence?

A
The objects are both positively charged.
B
The objects are both negatively charged.
C
The objects have no charge.
D
The objects have opposite charges.
16

A supervisor spends a day inspecting a nuclear plant for potential radiation leaks. She has to move throughout the plant inspecting all the equipment and machinery. She needs to take two different radiation detection devices to help ensure her safety and to find radiation leaks. She needs the results immediately. Which two devices would be the best choices for the task?

A
Geiger counter and scintillation counter
B
Geiger counter and cloud chamber
C
cloud chamber and scintillation counter
D
film badge and scintillation counter
17

A probe is launched from Earth and lands on Mars. The gravitational acceleration on Mars is 3.7 m/s2.

A
The mass of the probe remains the same, but the weight of the probe increases.
B
The mass of the probe remains the same, but the weight of the probe decreases.
C
The mass of the probe increases, but the weight of the probe remains the same.
D
The mass of the probe decreases, but the weight of the probe remains the same.
18

In an area of the deep ocean, hot magma emerges from a crack in Earth’s crust. Which statement describes what will happen to the seawater above the crack as a result of convection?

A
Water molecules will break apart and flow in a circular pattern.
B
Water molecules will bond together and rise upward.
C
The water will become more dense and sink downward.
D
The water will become less dense and rise upward.
19

A car has a mass of 1,200 kg. What is its acceleration when the engine exerts a force of 600 N? (Formula: F=ma)

A
0.5 m/s2
B
2 m/s2
C
600 m/s2
D
1,800 m/s2
20

What is the potential energy of a 25 kg bicycle resting at the top of a hill 3 m high? (Formula: PE = mgh)

A
75 J
B
735 J
C
245 J
D
37.8 J

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