Hoberman Sphere
Hoberman Mega Sphere expanding
Hoberman Sphere
Hoberman switch pitch ball
Hoberman devices
Hoberman Gro-bot toy

 

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.