Hoberman Devices

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 Code Number :   1A60.45

Disclaimer:

Reprinted by permission of Dick Berg, University of Maryland, for use on this website.

The demonstrations contained and referenced herein are listed for the purposes of cataloging and describing physics demonstrations which should be conducted only under the direction of a trained instructional support professional or physicist. These demonstrations are not presented for the purpose of being conducted by persons unconnected to this Facility and/or persons not consulting with or being supervised by the recognized instructional support professional or physicist and his/her staff. The University is responsible only for those demonstrations carried out using its own equipment using established safety and scheduling policies, and bears no responsibility for those choosing to use this source material for their own purposes. All demonstrations described and contained herein are public domain, and can also be found in reference materials in libraries, bookstores, and electronic sources.

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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.

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   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.



Mail Questions and Comments to:  Dale Stille