title: Box2d : How to apply a force to keep swinging from left to right?
body: <p>i'm losing myself in this...</p>
  
  <p><strong>Situation:</strong>
  Working on a game in cocos2d with box2d and I have a ropejoint between one fixed body and one dynamic body.</p>
  
  <p>When I drop the dynamic body is swings from left to right and then from right to left due to the gravity in the world.</p>
  
  <p><strong>The problem:</strong>
  The swings are getting shorter and shorter till finally the dynamic body hangs still beneath the fixed body. This is normal behavior but I need it to keep swinging.</p>
  
  <p><strong>My thoughts:</strong> 
   I think I need to apply a tangential force to the ropejoint in the direction of the swinging but how to do this is a mystery for now :)</p>