4
QuizMultiple Choice

Lesson 2: Conservation of Energy

Question 4 • 350CR Integrated Science

Which best describes how energy changes form in a car’s engine?

Answer
A
A single transformation occurs because the chemical energy of the fuel is changed to the mechanical energy of the car.
B
A single transformation occurs because the mechanical energy of the car originates from one spark.
C
Multiple transformations occur because the chemical energy of the fuel is changed to several forms of energy.
D
Multiple transformations occur because the chemical energy of the fuel must be replenished to keep the car running.

Explanation

A car engine does not convert fuel’s chemical energy directly into motion in just one step. Combustion releases heat, which drives the engine’s moving parts and produces mechanical energy; some energy also leaves as sound and heat. Thus, multiple energy transformations occur, as described by choice C.

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