Synthesized answer
The provided passages do not contain enough information to explain the key concepts of Aristotle's Physics in my own words. The passages only state the title, categories, and page count of the book [Passage 1]. Therefore, I cannot provide an explanation of the key concepts or ground any claims in the text.
Synthesized from the book passages below. Chat with the book on Feynman for follow-up.
From the book
Title: Aristotle's Physics by Aristotle Categories: Science Pages: 408