rigidBody.AddRelativeForce(...) doesn't do antything

I have a capsule 3D GameObject that has a RigidBody assigned to it. It’s Y position is frozen. Adding a script to the capsule with the following code:

using UnityEngine;
using System.Collections;

public class PlayerMovementScript : MonoBehaviour {

    Rigidbody rigidBody;
    void Start () {
        rigidBody = GetComponent<Rigidbody> ();
    }
   
    void FixedUpdate () {
        rigidBody.AddRelativeForce (Vector3.forward*5f);
    }
}

should let the capsule move forward with static speed. However, it doesn’t move at all. Help?

Turns out it actually worked. It just moved so slow I couldn’t see it. Problem solved