Gravity teaching aid

Details Gravity teaching aid Gravity teaching aid

1997-02-20

1998-09-22

Hirsch, Paul J.

Education and demonstration

Science

Physics

473570, G09B 2310

Patent

active

058106022

ABSTRACT:
A gravity teaching aid in the form of a tennis ball which includes a magnet for retaining the tennis ball against a metal surface against the downward pull exerted by the earth's magnetic field.

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