In your physical material enable override Friction Combine Mode. Then next to the Friction combine mode from the drop down choose either min or multiply. This will allow you to get smooth ice sliding behaviour. It basically checks your current physical material against the surface it interacts with. For instance setting it on multiply and using a friction value of 0 will make it slide for pretty much eternity. (which is a long time btw) Choose any low value under 0.2 and you’ll get sliding value’s that diminish.
