Player isn't affected by AddForce(), Lerp() etc.

Hey there, I am trying to make a hook since a loooooong while. Now I am nearly done, but the player isn't moving. So I tried to use my script on another object (a simple sphere) and it worked...

The next thing I did, was disabling all scripts of my player (not the hook script), but the player still didn't move. My hook-scipts: On the player I have got a really simple script, which shoots a sphere as a hook. On the hook itself I have got a script that stops the hook if it's touching something and then move the player to the position of the hook.

Scipt on the hook: using UnityEngine; using System.Collections;

 public class OnHook : MonoBehaviour {
 
     public GameObject player;
     public GameObject hook;
     GameObject other;
 
     public float speed = 20;
 
     public bool grabbed = false;
 
     // Use this for initialization
     void Start () {
 
         other = GameObject.FindWithTag ("Enemy");
     
     }
     
     // Update is called once per frame
     void Update () {
 
         if(grabbed)
         {
 //            other.rigidbody.AddForce((transform.position - other.transform.position).normalized * speed);  // This was my try using addForce
             player.transform.position = Vector3.Lerp(player.transform.position, hook.transform.position, Time.deltaTime * speed);
         }
     
     }
     
 
     void OnTriggerEnter(Collider col){
 
         if(col.tag != "Player" && col.tag != "Hook")
         {
             grabbed = true;
             rigidbody.velocity = Vector3.zero;
         }
 
     }
 }

Thank you for your help!