how to stop the bouncing effect of player when hit on the wall

using UnityEngine; using System.Collections;

public class Accelerometer : MonoBehaviour {

public Vector3 positionplayer;

// Update is called once per frame void Update () { transform.Translate(Input.acceleration.x, 0, -Input.acceleration.z); transform.Rotate (0,0,0); }

} i have attached this script to the player,every thing is working fine but when it hits an obstacle it starts bouncing..but it doesn't bounce on the ground(only when the wall is hit)

i have made the ground using plane and four walls using cube

For player have added a collider, rigid body and set rigidbody to gravity with mass 1

for the walls i have added box collider and just a rigidbody