Rotating Elastic Rings

Purpose

To demonstrate "centrifugal reaction" and to indicate why the earth is oblate.

Equipment

Elastic ring assembly and hand-cranked rotator, as photographed.

Images

d1-55

Description

Turning the crank causes the elastic rings to rotate about the vertical axis. The "centrifugal reaction" then causes the rings to assume an oblate spheroidal shape like that of the Earth.