Ducksters
Ducksters: Physics for Kids: Friction
Kids learn about the science behind friction including how it works as a force to slow things down, how it helps us stand, preventing friction, types, and fun facts.
Channel 4 Learning
Channel 4 Learning: Science Essentials: Friction
Brief explanation of friction, with learning reinforcement, such as a quiz, a glossary, an image bank, and frequently asked questions about friction.
Exploratorium
Exploratorium: The Science of Sports Cycling
A detailed look at the aerodynamic principles associated with cycling. Good science and even better web page design. Includes an online calculator that allows the user to calculate the aerodynamic drag and propulsive power of a bicyclist...
Other
Arab Physics
While some of the pages on this site have yet to be filled, the pages that are complete are comprehensive. For example, pages on friction, heat, and the Doppler effect are illustrated and explain relevant formulas. A biography page...