# How to add spin to a ball in Pong game

So I’m creating a 2D pong game, and I’d like to implement a spin to the ball whenever the player, for example moves down, creating back spin. Or if the player moves up, creating top spin.

And if the ball had some top spin to it, and it hit the other player( who wasn’t moving ) then I’d like for it to move in the up direction, opposite with backspin.

Another thing I’d like to implement would be, if the ball had topspin creating, I’d like for it to keep on getting more and more spin if both the players allow it to spin the same direction.

I haven’t got much code on this as I have no idea how I would implement this, I’ve tried messing around with `rigidbody2D.rotation` but it doesn’t seem to affect much as I’m not completely sure on how to use this.

A game that does this type of physics well, is Sports Heads: Football (This is for reference if someone isn’t sure what I mean)

This is the only bit of code I have concerning the player and ball’s interaction.

``````function OnCollisionEnter2D (colInfo : Collision2D) {

if(colInfo.collider.tag == "Player") {
//The velocity of the ball is, the player's velocity/2 + the ball's velocity/3;
rigidbody2D.velocity.y = rigidbody2D.velocity.y/2 + colInfo.collider.rigidbody2D.velocity.y/3;

audio.pitch = Random.Range(0.8f, 1.2f);
audio.Play();

}

}
``````

Take a look at this :

How much effect you get will depend upon several things inc how much friction you get between your ball and your bats.

1)Try out different physical materials on your ball and bats :

1. Goto : Edit → Project Settings → Physics . Now look at “Max Angular Velocity” which will prob say 7. Up this a lot to 40 or 50 ish, this is the max spin any object can have and 7 will not be enough for what you need.