Object is moving slower on other device (Android)

Hello everyone, Tudor here,
I am developing a game. On my phone (Android) the "Cube" is moving normal. But on my tablet it moves a lot slower. Why?

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3.  
4. public class AndroidControlDown : MonoBehaviour {
5.     public GameObject Cube;
6.     private Vector3 input;    //For rigidbody.AddForce
7.     // Update is called once per frame
8.     void Update ()
9.     {
10.         if(Input.touchCount > 0)
11.         {
12.             if(guiTexture.HitTest(Input.GetTouch(0).position))
13.             {
14.                 input = new Vector3(0, 0, -55);
15.                 Cube.rigidbody.AddForce(input);
16.             }
17.         }
18.     }
19. }
20.  

That's, for example, the code for the down button. Can someone please help me? Should I use FixedUpdate()?