Physics.bounceThreshold
static var bounceThreshold: float;
static float bounceThreshold;
static bounceThreshold as float
Description

Two colliding objects with a relative velocity below this will not bounce (default 2). Must be positive.

This value is usually changed in Edit->Project Settings->Physics inspector instead of from scripts.
	Physics.bounceThreshold = 1;
using UnityEngine;
using System.Collections;

public class Example : MonoBehaviour {
    void Example() {
        Physics.bounceThreshold = 1;
    }
}
import UnityEngine
import System.Collections

public class Example(MonoBehaviour):

	def Example() as void:
		Physics.bounceThreshold = 1