Literaturnachweis - Detailanzeige
| Autor/inn/en | Burko, L. M.; Price, R. H. |
|---|---|
| Titel | Ballistic trajectory: Parabola, ellipse, or what? |
| Quelle | In: American journal of physics, 73 (2005) 6, S. 516-520
PDF als Volltext |
| Sprache | englisch |
| Dokumenttyp | online; gedruckt; Zeitschriftenaufsatz |
| ISSN | 0002-9505; 1943-2909 |
| DOI | 10.1119/1.1866097 |
| Schlagwörter | Gravitation; Physik; Wurfbahn; Wurf |
| Abstract | Mechanics texts tell us that a particle in a bound orbit under a gravitational central force moves in an ellipse, while introductory physics texts approximate the earth as flat, and tell us that the particle moves in a parabola. The latter is meant to be an approximation to a small segment of the true central-force/elliptical orbit. To look more deeply into this connection, we convert earth-centered polar coordinates to ''flat-earth coordinates'' by treating radial lines as vertical and by treating lines of constant radial distance as horizontal. We consider questions such as whether gravity is purely vertical in this picture, and whether the central force nature of gravity is important only when the height or range of a ballistic trajectory is comparable to the earth's radius. Somewhat surprisingly, the answers to both questions are ''no,'' and therein lie some interesting lessons. © 2005 American Association of Physics Teachers. |
| Erfasst von | Arbeitsgruppe Didaktik der Physik, Universität Osnabrück |
| Update | 2005/3 |
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