Physical material friction not having an effect.

I can’t seem to get the friction attribute on physical materials to have any effect. I have set the friction to maximum on a physical material and set the combine to max, applied this to a material, then applied the material to all objects that interact with each other.
However; nothing happens. For example, when my character walks into a ball, the ball will just carry on moving forwards forever even though both the ball and floor have the physical material applied.

I know that I have created these materials correctly as restitution works fine.