Bicycle-wheel gyroscope Check it out! When the wheel isn't spinning, it's easy to tilt it from side to side. But when the wheel is given a spin, its forward momentum resists side to side movement. Try it yourself. You'll need a friend or parent to spin the wheel, and be careful to keep your fingers away from the spokes. Back to How a Torpedo Works Tour U-869 | Sole Survivor | Hazards of Diving Deep 400 Years of Subs | Map of Lost U-Boats | Fire a Torpedo Resources | Transcript | Site Map | Hitler's Lost Sub Home Editor's Picks | Previous Sites | Join Us/E-mail | TV/Web Schedule About NOVA | Teachers | Site Map | Shop | Jobs | Search | To print PBS Online | NOVA Online | WGBH © | Updated November 2000