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.
Content Note
Simple machines -- Wheel and axle parts -- Rolling on wheels -- Dragging and rolling -- Wheels, axles, and forces -- Gear wheels -- Wheels, axles, and gears at work -- Wheel and axle system -- Inventing the wheel -- Wheels and axles in the past -- Rolling and slowing -- Rough and smooth -- Amazing machines.