File:Tidal-forces.png
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Diagram of tidal forces.
The upper picture shows a small planet and the red arrows show the gravitational forces attracting it towards a much larger planet off to the right. Since gravity is proportional to 1/R^2, the forces to the right are slightly larger than those at the center, which are slightly larger than those at the left.
The lower picture shows the forces when a constant offset corresponding to the force at the center has been subtracted from all forces. The central force is then, of course, zero. A small force remains towards the right, directed rightwards. A small force, directed leftwards, remains at the left. This is why (perhaps somewhat counter-intuitively) tidal forces lead to a bulge on both sides of the smaller planet.
Created with photoshop.
Source: downloaded from English Wikipedia (en:Image:Tidal-forces.png)
Author: en:User:William M. Connolley
Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License.http://www.gnu.org/copyleft/fdl.htmlGFDLGNU Free Documentation Licensetruetrue |
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current | 17:54, 14 February 2005 | 400 × 400 (15 KB) | RuM (talk | contribs) | image from english wikipedia |
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