AnswersNC-Physical ScienceUnit Test

Unit Test — Unit test Answers

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1
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Which set of terms best defines what affects kinetic energy and potential energy, respectively?

A
position, gravity
B
gravity, velocity
C
velocity, height
D
height, position
2
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Which term is the product of force and distance?

A
power
B
work
C
net force
D
acceleration
3

What is needed for work to be done?

A
A force must push on an object without moving it.
B
A force must pull on an object without moving it.
C
A force must cause an object to move along the same direction as the force.
D
A force must act on an object while an equal force acts oppositely on the object.
4

Seema knows the mass of a basketball. What other information is needed to find the ball’s potential energy?

A
the volume and height the ball reaches
B
the volume and shape of the ball
C
acceleration due to gravity and the height the ball reaches
D
acceleration due to gravity and the shape of the ball
5

What is the source of almost all energy on Earth?

A
Earth’s hot core
B
the Sun
C
stored carbon
D
moving water
6

As a person pushes a box across a floor, the energy from the person’s moving arm is transferred to the box, and the box and the floor become warm. During this process, what happens to energy?

A
It is increased.
B
It is conserved.
C
It is decreased.
D
It is created.
7

Adita lifts a book from the floor, carries it across the room, and places it on a high shelf. When is Adita doing work on the book?

A
She does work on the book at no time during this process.
B
She does work only while she carries the book across the room.
C
She does work from the moment she touches the book until she lets it go.
D
She does work as she picks up the book and as she lifts it to the shelf.
8

Simone created a chart to summarize the energy transformations that take place when energy from the wind is used to generate electricity.Which best completes the chart?

Question illustration
A
nuclear energy transformed to electrical energy
B
chemical energy transformed to electrical energy
C
radiant energy transformed to mechanical energy
D
kinetic energy transformed to mechanical energy
9

When a person strikes and lights a match, potential energy in the match is transformed into which types of energy?

A
electrical and thermal
B
thermal and radiant
C
radiant and nuclear
D
nuclear and kinetic
10

The table shows information about four students who are running around a track. Which statement is supported by the information in the chart?

Question illustration
A
Autumn has more kinetic energy than Chiang.
B
Mohammed has less kinetic energy than Autumn.
C
Lexy has more kinetic energy than Mohammed.
D
Chiang has less kinetic energy than Lexy.
11

If the kinetic and potential energy in a system are equal, then the potential energy increases. What happens as a result?

A
Total energy increases.
B
Stored energy decreases.
C
Energy of motion decreases.
D
Total energy decreases.
12

A powered winch is used to pull a sailboat to shore. The winch uses a 900 W motor.If the motor is used for 30 s, how much work does it do? (Power: P = W/t)

A
0.03 J
B
30 J
C
960 J
D
27,000 J
13

Plants are responsible for a very important energy transformation, as shown.

Question illustration
A
radiant to chemical
B
nuclear to mechanical
C
chemical to thermal
D
mechanical to chemical
14

Shani poses as the Statue of Liberty for an art class. She holds a torch above her head with her right hand and a book against her side with her left hand. She holds the pose for ten minutes. At the end of the session, she mentions to her friend that it was a lot of work to pose and that her arms are really tired.Which describes the work Shani did while she posed?(assume the starting work position is when her hand is already raised )

A
She did more work with her right hand than with her left because the right was held up higher.
B
She did no work while she posed because she did not move the torch or the book.
C
She did work while she posed because she was tired at the end of the session.
D
She did no work while she posed because she did not exert a force on anything.
15

What happens in terms of energy when a moving car hits a parked car, causing the parked car to move?

A
The moving car transfers kinetic energy to the parked car.
B
Kinetic energy in the moving car disappears.
C
Kinetic energy in the parked car is created.
D
The parked car transfers kinetic energy to the moving car.
16

Joshua programs a robotic arm to place a block in a box by following the sequence of commands in the table.During which step does the robotic arm do work on the block?

Question illustration
A
Step 1
B
Step 2
C
Step 3
D
Step 4
17

Olivia is on a swing at the playground.

Question illustration
A
W
B
X
C
Y
D
Z
18

Energy can be transformed from one form to another. The diagram shows one such process.

Question illustration
A
nuclear to thermal and radiant
B
nuclear to electrical and chemical
C
chemical to nuclear and radiant
D
chemical to electrical and nuclear
19

Which activity directly converts energy from the Sun into chemical energy?

A
a snake lying on a sunny rock to keep warm
B
a rabbit using energy from food it has eaten to run
C
a bean plant making its own food to grow
D
a person burning firewood to cook food
20

Power is measured in which unit?

A
joules
B
watts
C
meters per second
D
newtons per meter

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