Physical material problem!

Sooo… I don’t know if I am just stupid… but i am having a little problem with physical materials… especially friction.
I am trying to make a ball that rolls, but it is really “slippery”, so I thought about putting a physical material over it, I selected physical material override in the collision box of the object(I don’t use collision boxes or spheres in blueprints…), but it doesn’t have any effect… Hope someone knows how to solve this.
Thanks!