Creator's description:  You've bought your ticket and boarded the roller coaster. Now you're barreling down the track at 60 miles per hour, taking hairpin turns and completing death-defying loops. Your heart is in your throat and your stomach is somewhere near your shoes. The only thing separating you from total disaster is a safety harness...but are you really in danger?

CoursePal comments:  Easy navigation, well-organized and well-illustrated. No registration is required for this free web-based course. Includes a useful physics glossary.