Annenberg Learner: Welcome to Amusement Park Physics
Although at first glance, Amusement Park Physics looks like it might be aimed at younger students, the topics covered are really suitable for middle school students and even high school physics students. What a great way to investigate principles of physics by examining the laws as they occur in amusement rides. Find out how free fall rides work, follow the directions on how to demonstrate the free-fall phenomenon, read about Newton’s laws of motion, and find examples of them in the amusement park. Many common rides are part of this park, including the roller coaster. Design your own to see if it passes the fun and safety tests.
http://www.learner.org/interactives/parkphysics/
Science of Cycling: Bicycle Physics and History
You don’t have to understand the physics behind riding a bicycle to enjoy a good ride, but if you want to find out how things work, you can’t do better than perusing this site. Divided into six sections, the topics include the wheel, frames and materials, aerodynamics, drives and gears, braking and steering, and probably the most important to make cycling really work, human power. You get a taste of the history of the development of bicycle in each section. The physics parts are easy to read and include some interactive calculations and other activities. Listen to and watch some competitive bicyclists talk about their techniques. Now get out and pedal.
http://www.exploratorium.edu/cycling/