Has he ever spent any time playing with the physics (and other) simulations at phet? He might enjoy the interactive, conceptual nature of these.
https://phet.colorado.edu/en/simulations/filter?subjects=physics&sort=alpha&view=grid

He might also get something out of physics enrichment courses designed for grade 7-12 students by MIT students. No homework, no tests, and no math prerequisites. Just interesting video lectures. From the syllabus: "There are no formal prerequisites for this class. However, students should exist in actuality and be located inside a universe, preferably this one."
https://ocw.mit.edu/high-school/physics/the-big-questions/index.htm

The American Physical Society hosts this page for precollege students, with child-friendly articles, activities, and science adventure stories:
https://www.physicscentral.com/

...pronounced like the long vowel and first letter of the alphabet...