Educational devices
US4358276A · kind A · utility
Inventor
Key dates
| Filing date | Jul 20, 1981 |
| Grant date | Nov 9, 1982 |
| Priority date | — |
| Expiry date | Jul 20, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09B23/10
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A simple, durable, inexpensive educational device for demonstrating the physical properties of colliding, accelerating and vibrating objects, especially suitable for use by educational institutions at or below the college level is described. The device consists of a pressure sensitive medium affixed to a hard flat surface which may be made to vibrate while one or more balls are made to roll on the surface, resulting in visible imprints in the form of dotted or wavy lines. The distance between dots or the individual undulations of the wavy lines serve to mark the positions of the balls at equally spaced instants of time, and thereby allow a determination of the ball velocities and accelerations without requiring compressed air, spark timers, or stroboscopic photography.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.