title: Simulate "Newton's law of universal gravitation" using Box2D
body: <p>I want to simulate <a href="http://en.wikipedia.org/wiki/Newton%27s_law_of_universal_gravitation" rel="nofollow">Newton's law of universal gravitation</a> using Box2D.</p>
  
  <p>I went through the manual but couldn't find a way to do this.</p>
  
  <p>Basically what I want to do is place several objects in space (zero gravity) and simulate the movement.</p>
  
  <p>Any tips?</p>