how to drop mesh in all of directions?

hi my dears, i want in my android game create a drop system. how to create this? similar to Can Knockdown drop system!accurate.. this is my script but it is just in one direction.! #pragma strict

       var halghe : Rigidbody;
       var halghe2 : Rigidbody;
       var speeddrop : float;
      
     function Start () {
      
     }
      
     function Update () {
      
         if(Input.GetTouch(0).phase == TouchPhase.Moved)
         {
                
         var Partab :  Rigidbody = Instantiate(halghe,this.transform.position,this.transform.rotation);
        
        
             Partab.AddForce(this.transform.forward * speeddrop);
         }
        
      
     }
     //tavabe-e karbordie kole script