Posted by MarkB_MI on August 09, 2008 at 18:20:57 from (216.234.126.22):
In Reply to: gravity posted by ken in texas on August 09, 2008 at 16:24:28:
The reason the Law of Gravity is called a "law" (as opposed to a "theory") is that it can only be observed, not proven. Now there are plenty of theories around (such as those developed by Einstein) that seek to explain the relationship between the various forces of nature, but they don't really explain "why" gravity occurs. Gravity is pretty much a given.
Now Newton's Law of Gravity simply says that matter is attracted to other matter, and the force of the attraction becomes stronger the closer two objects are or the more massive the objects are. (Actually it's stated in mathematical terms, but that's basically what it says.)
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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