AnswersPBCSD_Grade_Forgiveness_2003310_Physical Science_S2_2022Energy Transformations

Human Impact on Resources Answers

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The image shows a dam.

Question illustration
A
X: kinetic energyY: potential energy
B
X: potential energyY: kinetic energy
C
X: mechanical energyY: electrical energy
D
X: electrical energyY: mechanical energy
2
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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.
3

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
4

Which change is an example of transforming potential energy to kinetic energy?

A
changing thermal energy to electrical energy
B
changing mechanical energy to chemical energy
C
changing nuclear energy to radiant energy
D
changing radiant energy to electrical energy
5

Solar-powered cars use energy from the Sun to work. A panel on the car absorbs light energy from the Sun, which then generates an electric current. This electric current, in turn, allows the car to move. Which shows the correct order of energy transformations that take place in a solar-powered car?

A
electrical, chemical, kinetic
B
electrical, kinetic, radiant
C
radiant, chemical, electrical
D
radiant, electrical, mechanical
6

Wood has chemical energy, which can be used to generate thermal and radiant energy when burned in a fireplace. Which best explains what happens to the total amount of energy in this scenario?

A
The total energy in the system increases because chemical energy creates thermal and radiant energy.
B
The total energy in the system decreases because chemical energy disappears as thermal and radiant energy are generated.
C
The total energy in the system remains the same as the decrease in chemical energy equals the increase in thermal and radiant energy.
D
The total energy in the system remains the same as the increase in chemical energy equals the decrease in thermal and radiant energy.
7

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
8

What are the two main types of energy?

A
radiant and chemical
B
thermal and radiant
C
potential and chemical
D
kinetic and potential
9

The diagram shows a swinging pendulum.

Question illustration
A
The pendulum will slow down and eventually stop moving as the mechanical energy transforms to thermal energy.
B
The pendulum will slow down and eventually stop moving as the mechanical energy disappears.
C
The pendulum will continue moving at the same speed because mechanical energy is created as the pendulum moves.
D
The pendulum will slow down but will not stop moving because some of the mechanical energy is destroyed.
10

The human body stores chemical energy from digested food. Some of the chemical energy is converted into mechanical energy when the body moves. Which statement is best supported by this information?

A
The body does not convert chemical energy to thermal energy.
B
The body does not convert chemical energy to kinetic energy.
C
Digested food is a source of potential energy.
D
Digested food is a form of radiant energy.

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