The author introduces the roller coaster ride in the first paragraph to introduce the main idea of the text.
We can arrive at this answer because:
The text to which the question refers, the author wants to discuss the operation of roller coasters and show how these machines are interesting and have many scientific concepts, for this reason, he presents the roller coaster ride in the first paragraph.
This question is about "A Screamingly Good Science Lesson"
More information about the central idea at the link:
https://brainly.com/question/1914191