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1A60.45 - Hoberman Devices
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Code Number: 1A60.45
Demo Title: Hoberman Devices
Condition: Good
Principle: Scaling
Area of Study: Mechanics
Equipment:
Hoberman Sphere, MEGA Sphere, and Hoberman Flight Ring, Hoberman Ball.
Procedure:
Open or close the devices to show a relationship between volume and surface area. The MEGA Sphere will open to a diameter of 4.5'. However, as it is a little heavier in construction it may be a little more difficult to operate. It can also be locked in the open position. Throw the ball into the air with a fast spin and it will flip to the other color.
References:
- Blane Baker, "Using an Expandable Toy in Discussing Rotational Motion", TPT, Vol. 43, # 4, Apr. 2005, p. 247.
- Ivars Peterson, "Surreal Spheres", How it Works - Science Supplement, Spring 2000, p. 212- 215.