title: OnCollisionEnter2D(...) not called
body: <p>I want to make a Pong game with Unity, but I can't detect collisions between a ball and a boxCollider. They both have a RigidBody2D component.</p>
  
  <p>This is the method :</p>
  
  <pre><code>void OncollisionEnter2D (Collision2D collisionInfo) 
  {
      Debug.Log("Collision");
      /*if (collisionInfo.collider.tag == "Player") 
      {
          Debug.Log("CA MARCHE !");
      }*/
  }
  </code></pre>
  
  <p>Is Kinematic and IsTrigger are unchecked for each.</p>