PhysicMaterial.frictionCombine  

var frictionCombine : PhysicMaterialCombine

Description

Determines how the friction is combined.

Traditionally friction properties are dependent on the combination of the two materials in contact. This is however impractical in a game. Instead you can use the combine mode to tune how the friction values of two materials are combined.

collider.material.frictionCombine = PhysicMaterialCombine.Average;

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
    void Example() {
        collider.material.frictionCombine = PhysicMaterialCombine.Average;
    }
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

    def Example():
        collider.material.frictionCombine = PhysicMaterialCombine.Average