P.S.: My conversation with my son was inspired by an excellent article by Arthur Steiner titled "The Story of Force: from Aristotle to Einstein". As the author writes, "a history-based exposure to the conceptual development of Newtonian mechanics is superior to a conventional textbook-centered approach, because it is contextual, shows the intellectual struggle involved in scientific thinking and relates better to students' knowledge and experience." I couldn't agree more.
Credits: images from Wikimedia; thanks to Sean C. for pointing me at the video by Feynman.