Hi CFK,
I did a Google search for "online physics courses" and got some hits. Try this one:
http://www.mcasco.com/p1outln.htmlAlso, here's a link to information about particle physics:
http://www.stfc.ac.uk/PandS/SchEdu/Rsrc/PP/Elec/ppres_web.aspxHas he done any practical experiments? We do a lot of kitchen chemistry and biology (see my post answering "What IS the goal?"). There are a lot of books on the subject.
Here's a link to physics experiments for kids:
http://homeschooling.gomilpitas.com/directory/Physics.htm I'm a scientist, and doing practical work is absolutely essential to understanding the sciences. If you can't find an online course, you may wish to substitute some kitchen- and garage-type stuff.
Feel free to contact me if you have any more questions. I'm a biologist but have some knowledge about physics and chemistry (esp. at the middle school level).
Val