Final answer:
A simile is a figure of speech that compares two unlike things using 'like' or 'as'. It is used to make a comparison and help the reader understand the meaning.
Step-by-step explanation:
A simile is a figure of speech that compares two unlike things using the words 'like' or 'as' to make the comparison. In the first sentence, the author compares riding a roller coaster to flying. The simile means that riding a roller coaster can feel similar to the sensation of flying. In the second sentence, the author compares a motor to the moving belt at a store checkout. The simile means that the motor is similar to the moving belt in the sense that it moves a chain in a loop. In the third sentence, the author compares the roller coaster's sound to thunder. The simile means that the sound of the roller coaster is as loud as thunder.
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