I do not speak perfect English.
We are sorry.
1. Position variables, object variables are created.
2. Is packed in a variable object (Ball).
3. Start ----> create an object in a variable position (Ball).
4. A key input ----> AddForce to object.
5. Ball, -------> Collision Event.
* 5. Collision Event object that is stored in a variable can not be applied to.
Thank you.