collider.material.dynamicFriction = 1;

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
void Awake() {
collider.material.dynamicFriction = 1;
}
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

def Awake():
collider.material.dynamicFriction = 1