Posted by KEB1 on August 10, 2008 at 08:52:10 from (63.227.11.236):
In Reply to: gravity posted by ken in texas on August 09, 2008 at 16:24:28:
Gravity is one of the fundamental forces of nature, like electromagnetism and the nuclear forces that bind matter together. Basically, all matter is attracted to all other matter. The strength of the attraction is a function of the mass (in your case, the earth and your body) and distance.
For example, astronauts on the moon weigh less than they do on earth because the moon has less mass and therefore less gravitational attraction. Note the difference between weight and mass - mass is a measure of the amount of matter in an object, weight is a measure of the gravitational attraction.
We have a pretty good understanding of the effects of gravity, including the relativistic effects on time and space. However, physicists are still working on understanding how it works at the sub-atomic level. Physicists are working on what's called a "grand unification theory" that unifies the four known, forces of nature; the weak nuclear force, the strong nuclear force, electromagnetism, and gravity.
Keith
By the way, Joe Newman is basically a nut case. If you look carefully at his "energy machine", it never produces more energy than what is put into it. Notice he never shows a measure of energy in vs energy out, only "demonstrations" that really don't demonstrate anything new. There's a reason he's never been able to get a patent; it simply doesn't work.
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