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There are many types of energy. One type is kinetic energy, which is the energy an object has when it is moving.
Read the passage about a bike ride. Think about the kinetic energy of the person riding the bike.
Ellen was training for a bike race. One afternoon, she grabbed her helmet and took her bike out to the street. She got on the bike and started to pedal, pushing hard to start moving forward.
Which of the following is better evidence that Ellen's kinetic energy changed?
When the amount of any type of energy changes, an energy transformation is happening. When one or more types of energy decrease, at least one other type of energy increases. This is because during energy transformations, energy is converted between different types.
Read the passage again and think about the energy transformation. Keep in mind that muscle cells use chemical potential energy when they expand or contract to move parts of a person's body.
Ellen was training for a bike race. One afternoon, she grabbed her helmet and took her bike out to the street. She got on the bike and started to pedal, pushing hard to start moving forward.
Complete the sentence.
When Ellen started riding, __________ was converted into kinetic energy.
Read the same passage and think about the evidence that kinetic energy, chemical potential energy, and thermal energy changed.
Ellen biked in a straight line along the street. Then, to avoid the sun, she moved over to ride under the shade of some trees. But as she pedaled faster and sped up, Ellen started to feel hot even in the shade.
Consider the following claim:
While Ellen was pedaling, chemical potential energy was converted to both kinetic energy and thermal energy.
Which piece of evidence best supports the claim?
Read the passage about the next part of the ride. Think about the evidence for changes in kinetic energy and sound energy.
By the time Ellen reached the top of the hill, she was exhausted and breathing hard. So, she stopped pedaling and coasted toward a water fountain. As she coasted, she heard gravel crunch beneath her tires, and her bike slowed to a stop.
Consider the following claim:
While Ellen's bike was on the gravel, kinetic energy was converted to sound energy.
Which piece of evidence best supports the claim?
Based on what you learned about the bike ride, which of the following statements about energy transformations are true? Select all that apply.