void  OnCollisionEnter(Collision collision) {      

            if(collision.gameObject.name == "MyTerrain"){
                
              Debug.Log ("Collision with" + collision.gameObject.name );       
           }
      }
      void  OnCollisionStay(Collision collision) {         
            if(collision.gameObject.name == "MyTerrain"){        
                
              Debug.Log ("Collision with" + collision.gameObject.name );       
           }      
      }

using UnityEngine;
using System.Collections;

public class CubeScript : MonoBehaviour {

   // Use this for initialization
   void Start () {
     
   }
     
   // Update is called once per frame
   void Update () {
     
   }
   void  OnCollisionEnter(Collision collision) {        

              if(collision.gameObject.name == "MyTerrain"){   
                    
                Debug.Log ("Collision with" + collision.gameObject.name );         
             }   
        }   
        void  OnCollisionStay(Collision collision) {           
              if(collision.gameObject.name == "MyTerrain"){          
                    
                Debug.Log ("Collision with" + collision.gameObject.name );         
             }        
        }
}