ics.uq.edu.au> 2bb97c95   
   XPost: sci.physics, sci.space.tech   
   From: timo@physics.uq.edu.au   
      
   On Thu, 10 Jul 2003, George Kinley wrote:   
      
   > if there is no Atmosphere, where do rockets that go in Space get thrust from   
      
   Stand on a skateboard on a smooth flat surface, with a bag of rocks. Throw   
   the rocks in one direction, and you'll go in the other direction (except   
   for the inconvenient effects of friction - use bigger rocks and you should   
   see an effect). The rocket works exactly the same way. Throw mass away in   
   one direction, and you go in the other direction. "Conservation of   
   momentum" is what it's all about.   
      
   --   
   Timo Nieminen - Home page: http://www.physics.uq.edu.au/people/nieminen/   
   Shrine to Spirits: http://www.users.bigpond.com/timo_nieminen/spirits.html   
      
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