rigidbody.AddForce affects all clones

Hello, on scene I have 3 balls with Ball.cs script attached to each of them. And when I push ball with mouse all balls start moving, but I need that only one that I touch moves.

Here is my FixedUpdate:

 void FixedUpdate() {
     if(!isMoving) {
     
         if (Input.GetMouseButtonDown (0)) {
     
             Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
             RaycastHit hit;
             if (Physics.Raycast(ray, out hit, 100)) {
             if(hit.collider.tag == "Ball") {
                 startPos = hit.point;
             }
             }
         }
                 
         if (startPos != Vector3.zero && Input.GetMouseButtonUp(0)) {
             endPos = Camera.main.ScreenToWorldPoint(Input.mousePosition);
                     
             Vector3 direction = endPos - startPos;
             direction.Normalize();
     
             float distance = Vector3.Distance(endPos, startPos);
                     
             rigidbody.AddForce(direction * distance * force * Time.deltaTime, ForceMode.Impulse);
     
             isMoving = true;
         }
     } else {
         if(rigidbody.velocity.sqrMagnitude == 0) {
             isMoving = false;
             startPos = endPos = Vector3.zero;
         }
     }
 }