Simple Experiments with Wheels and Axles

Book excerpt: Every time you turn on a faucet, ride a bike, or open a door, you're using a simple machine called a wheel and axle. This book uses clear text and practical, every-day examples to explain the physics behind the wheel and axle. Easy-to-read diagrams and large, vivid photographs aid understanding, and experiments encourage students to learn first-hand how this helpful simple machine works.