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.

Disclaimer

These demonstrations are provided only for illustrative use by persons affiliated with The University of Iowa and only under the direction of a trained instructor or physicist. The University of Iowa is not responsible for demonstrations performed by those using their own equipment or who choose to use this reference material for their own purpose. The demonstrations included here are within the public domain and can be found in materials contained in libraries, bookstores, and through electronic sources. Performing all or any portion of any of these demonstrations, with or without revisions not depicted here entails inherent risks. These risks include, without limitation, bodily injury (and possibly death), including risks to health that may be temporary or permanent and that may exacerbate a pre-existing medical condition; and property loss or damage. Anyone performing any part of these demonstrations, even with revisions, knowingly and voluntarily assumes all risks associated with them.

Instructional Resources and Lecture Demonstrations

1A60.45 - Hoberman Devices

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