TeachEngineering
Teach Engineering: Hovercraft Racers!
Students gain first-hand experience on how friction affects motion. They build a hovercraft using air from a balloon to levitate a craft made from a compact disk (CD), learning that a bed of air under an object significantly reduces the...
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...