title: Changing SKPhysicsBody parameters doesn't have effect
body: <p>I try to simulate behavior of different types of balls (football ball, tennis, golf, volleyball  etc). For these purposes I tried to change density, mass, size parameters of the physics body. 
  In my game it doesn't have effect and I tried to simulate it in very simple app consists from ball and paddle </p>
  
  <p><a href="https://i.stack.imgur.com/UXHjF.png" rel="noreferrer"><img src="https://i.stack.imgur.com/UXHjF.png" alt="enter image description here"></a></p>
  
  <p>the ball always <strong>rises to the same height with the same speed</strong> regardless of mass, density, size</p>
  
  <p><a href="https://i.stack.imgur.com/weE9g.png" rel="noreferrer"><img src="https://i.stack.imgur.com/weE9g.png" alt="setting for the ball"></a></p>
  
  <p><a href="https://i.stack.imgur.com/n85j3.png" rel="noreferrer"><img src="https://i.stack.imgur.com/n85j3.png" alt="enter image description here"></a></p>
  
  <p>Is this because of restitution equals 1? How can I simulate behavior of different ball types in this way?</p>