Deformation by Central Forces – 1D52.00

Flattening the Earth – 1D52.10

Hoberman Sphere

  • Hang the Hoberman Sphere.
  • Rotate the sphere and, like the Earth, it becomes oblate.
  • Its equator moves outward and its poles draw together.
  • Central forces push the sphere’s center outwards, narrowing it’s radius.

Location: Jacobs B122 – Shelf 283

Water Parabola – 1D52.20


  • A rectangular flat glass container mounted on ball bearings is filled with colored water and spun.
  • As the setup rotates, one can observe the parabolic curve formed by the water’s surface.

Location: Jacobs B122 – Shelf 265