physics problem

Hello everybody.

I have started playing around with unity a few days ago. I’m trying to do a simple thing but i not successful. I’m trying to make a ball going against the inside walls of a box.

The problems is defining the movement of the ball after hitting the wall. I start by adding a force to de ball, but how i make it move realistic after hitting the wall? Witch proprieties should i manipulate?

Thanks for your help

Ângela

Physics Material on the colliders itself.