Think of it this way - pretend your'e floating in space next to somebody else.
You push them. You're BOTH going to start moving in opposite directions, right?
Now think on a smaller level - you're floating in space all alone. You throw a wrench.
The wrench will go flying, but you too will go in the opposite direction. Not as fast as you did when you pushed the more massive person, but even so, you WILL move.
Remember that sitting in your rocket, when you fire an engine, you're shooting SOMETHING out of the rocket engine.
Not something as massive as a person, and not even something as massive as a wrench, but you are shooting hot gasses. That gas is made up of atoms which each have mass.
Each atom is like a tiny wrench - it goes flying through space, and you get pushed back in the opposite direction ever so slightly when it gets shot out. But because you're throwing trilliions of little wrenches, "ever so slightly" adds up pretty quickly.
This post was edited by JRSutton at 12:09:16 02/17/14 2 times.
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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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