anchor: Body:applyAngularImpulse
  Applies an angular impulse to a body. This makes a single, instantaneous addition to the body momentum.
  
  A body with with a larger mass will react less. The reaction does '''not''' depend on the timestep, and is equivalent to applying a force continuously for 1 second. Impulses are best used to give a single push to a body. For a continuous push to a body it is better to use Body:applyForce.
  Body:applyAngularImpulse( impulse )
  impulse number The impulse in kilogram-square meter per second.