Physics.minPenetrationForPenalty  

static var minPenetrationForPenalty : float

Description

The minimum contact penetration value in order to apply a penalty force (default 0.05). Must be positive.

This value is usually changed in Edit->Project Settings->Physics inspector instead of from scripts.

Physics.minPenetrationForPenalty = 0.1;

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
    void Example() {
        Physics.minPenetrationForPenalty = 0.1F;
    }
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

    def Example():
        Physics.minPenetrationForPenalty = 0.1F