Billiard ball effect not working

Helloo, i'm working in a billiard game and i have a problem. I try to make side spine effect in the ball but my way not works, the ball always goes forward. To do this I did a Raycast that starts from the tip of the stick and ends in contact with the ball. then I used Rigidbody.AddForceAtPosition and passed as parameters the forward direction of the ball and the hit.point of the Raycast on the ball.

C# Code:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class StickShoot : MonoBehaviour {

1. private Vector3 hitPoint;
2. public AudioSource AS;
3. public AudioClip breakOut;
4. public float gizmoRadius;
5. public float force;
6. // Use this for initialization
7. void Start () {
9. }
10. // Update is called once per frame
11. void FixedUpdate () {
12. RaycastHit hit;
13. if (Physics.Raycast (transform.position, transform.TransformDirection (-Vector3.forward), out hit)) {
14. if (hit.collider.tag == "WhiteBall") {
15. hitPoint = hit.point;
16. if (Input.GetKeyDown (KeyCode.Space)) {
17. hit.rigidbody.AddForceAtPosition (force*hit.transform.forward,hit.point,ForceMode.Impulse);
18. AS.PlayOneShot(breakOut);
19. }
20. }
21. }
22. }
23. void OnDrawGizmos()
24. {
25. Gizmos.color = Color.red;
26. Gizmos.DrawSphere (hitPoint, gizmoRadius);
27. Gizmos.color = Color.blue;
28. Gizmos.DrawLine (transform.position, hitPoint);
29. }

}