anchor: Body:setLinearDamping
  Sets the linear damping of a Body
  
  See Body:getLinearDamping for a definition of linear damping.
  
  Linear damping can take any value from 0 to infinity. It is recommended to stay between 0 and 0.1, though. Other values will make the objects look 'floaty'(if gravity is enabled).
  Body:setLinearDamping( ld )
  ld number The new linear damping