Question

1. why does the author talk about a roller coaster?

a) to show how energy can change from potential to kinetic
b) to prove roller coasters are fun
c) to explain how machines work
d) to describe only kinetic energy

Explanation:

To determine the correct answer, we analyze each option:

• Option a: Roller coasters involve changes in height (potential energy) and speed (kinetic energy), so using them to show energy transformation from potential to kinetic is logical.
• Option b: The question is about energy, not the fun of roller coasters, so this is irrelevant.
• Option c: Roller coasters are not a general example of how all machines work; the focus is on energy, not machine mechanics.
• Option d: Roller coasters involve both potential and kinetic energy, not just kinetic, so this is incorrect.

Answer:

a) To show how energy can change from potential to kinetic