Conservation of Angular Momentum – 1Q40.00

Rotating Stool with Weights – 1Q40.10



  • Start rotating with dumbbells close to your body.  Or else be careful to begin with a slow spin.
  • Watch the change in spin the masses are moved further away.

Location: Demo Room

Rotating Hoberman Sphere – 1Q40.22

Hoberman Sphere

  • Expand the Hoberman sphere by removing the small clip at the bottom.
  • Give the sphere a slight push to make it spin slowly.
  • As it is spinning, pull on the bottom pull ring and watch the angular velocity change.
  • Do not pull hard enough to collapse the sphere completely. This damages the pulley system.

Location: Jacobs B122 – Shelf 283

Pulling on the Whirligig – 1Q40.25


  • Attach balls to either ends of a string that passes through a hollow tube so you can set one ball twirling and pull on the other ball to change the radius.
  • Spin the ball around while holding the hollow tub.
  • Move the lower ball up and down to change the radius of the circle.

Location: Jacobs B122 – Shelf 279

Rotating Stool and the Bicycle Wheel – 1Q40.30



  • Tip a spinning wheel sitting on a rotating platform.
  • Tip the wheel in the opposite direction to spin to change the direction on the spinning platform.

Location: Demo Room

Suitcase Demo – 1Q40.50


  • A large fly-wheel is mounted in a suitcase.
  • Start the fly-wheel a couple of minutes before the demo.
  • Have a student carry the suitcase around the corner.

Location: Jacobs B122 – Shelf 033

Mystery Space Ship – Defies Gravity – 1Q40.55

Mystery Space Ship 1Q40.55

  • Plastic spaceship toy with encased gyroscope with a holder and a crank on top.
  • When cranked it performs numerous spinning tricks, balancing on its side, on center post, or attached to a string.

Location: Jacobs B122 – Shelf 264

Hero’s Engine – 1Q40.80


  • Put an amount of liquid nitrogen in the bottle and tighten the bottle to the cap and PVC pipe assembly.
  • Hold the other end of the PVC firmly and lower the bottom of the bottle into a container (Nalgene beaker) 1/3 full of water.
  • As soon as the bottom of the bottle touches the water the liquid nitrogen will begin to boil and pressurize.
  • The nitrogen gas escaping will cause the bottle to run at a high rate of speed.

Location: Jacobs B122 Shelf 285