Energy Transformations Answers

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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
2
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The diagram shows a swinging pendulum.

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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.
3

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

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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.
5

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.

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