AnswersPBCSD_Grade_Forgiveness_2003310_Physical Science_S2_2022Energy Transformations

Energy Transformations Answers

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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.
2
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Eddie and Val observed the picture of an athlete running in a race.

Question illustration
A
Only Eddie is correct because the picture does not show a transformation that starts with chemical energy.
B
Only Eddie is correct because the picture does not show a transformation that ends with mechanical energy.
C
Both Eddie and Val are correct because chemical energy is a type of potential energy and mechanical energy includes kinetic energy.
D
Both Eddie and Val are correct because chemical energy is a type of kinetic energy and mechanical energy includes potential energy.
3

Alana summarized what happens when a ball sitting on top of a grassy hill rolls down the hill.The motionless ball has potential energy. Once the ball starts to roll down the hill, new kinetic energy is made. As the ball rolls across the grass, it slows down. The kinetic energy of the ball is converted to other forms of energy.

A
The motionless ball does not have energy because it is still.
B
Kinetic energy is not made; it is a result of energy transformation.
C
The ball cannot slow down unless someone touches it.
D
The energy is not converted; it disappears.
4

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.
5

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
6

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
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

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
9

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.
10

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

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