question: What sentence would provide a factual answer to this question: "an example of converting potential energy to kinetic energy is"

answer: potential energy changes to kinetic energy through motion

question: What sentence would provide a factual answer to this question: "What does gravity cause substances on a planet?"

answer: gravity causes substances to be pulled down on a planet

question: What sentence would provide a factual answer to this question: "Which is likely to cause a spark?"

answer:
dry wood easily burns