AnswersFL-2002040-MJ Comprehensive Science 1 A-CRUnit Test

Unit Test — Unit test Answers

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This table shows four examples of experiments.

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A
Lily and Henry
B
Astrid and Bob
C
Lily, Astrid, Henry, and Bob
D
Astrid, Henry, and Bob
2
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Which is an example of potential energy?

A
a swimmer kicking their legs
B
a car driving on the road
C
an arrow flying at a target
D
a yo-yo in someone’s hand
3

A 40 kg dog is sitting on top of a hillside and has a potential energy of 1,568 J. What is the height of the hillside? (Formula: PE = mgh)

A
3.9 m
B
4.0 m
C
39.2 m
D
40.0 m
4

Kyle has a mass of 54 kg and is jogging at a velocity of 3 m/s. What is Kyle’s kinetic energy? (Formula: )

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A
18 J
B
81 J
C
162 J
D
243 J
5

Doug is doing work. Without knowing exactly what he is doing, which can be said about the work he is doing?

A
Energy is transferred.
B
Energy is increased.
C
Energy is decreased.
D
Energy is unchanged.
6

Which best defines energy?

A
a type of wave that carries energy through space, where there is almost no matter
B
a disturbance that carries energy form one place to another through matter and space
C
the ability to do work
D
pressing to make more compact
7

Ryan is examining the energy of the particles in a bar of gold. What is Ryan most likely studying?

A
thermal energy
B
electric energy
C
potential energy
D
internal energy
8

The total energy in a system is 675 J. The kinetic energy changes from 296 J to 432 J. Which statement best describes the potential energy of this system?

A
It changes from 296 J to 432 J.
B
It changes from 379 J to 243 J.
C
It changes from 432 J to 296 J.
D
It changes from 243 J to 379 J.

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