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| | Change in Length of Rubber Band |
 | | Suppose your rubber band was a "bungee cord", a bundle of rubber-bands wrapped in a braided fabric sleeve. |
 | | Whenever it moves, whether stretching or contracting, the rubber is rubbing against the fabric from the inside, or perhaps the crossed fibers of the braided sleeve are rubbing on each other, with some normal force, and some force and energy is lost to sliding friction. |
 | | Cordially, Jim Swenson ===================================================== Unless the rubber bands were very large, you probably exceeded the elastic limit of the rubber so that the rubber band was permanently deformed. |
| www.newton.dep.anl.gov /askasci/gen01/gen01601.htm (623 words) |
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