Roll a Ball wont roll?

Hey guys - I have been trying any answer I could find, but I just can’t seem to get my ball rolling. My speed is set to 100, and i’ve got the following script:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class PlayerMovement : MonoBehaviour {
	private Rigidbody rb;
	public float speed;
	void Start (){
		rb = GetComponent<Rigidbody> ();
	}
	void fixedUpdate () {
		float moveHorizontal = Input.GetAxis ("Horizontal");
		float moveVertical = Input.GetAxis ("Vertical");
		Vector3 movement = new Vector3 (moveHorizontal, 0.0f, moveVertical);
		rb.AddForce (movement * speed);
	}
}

If anyone could help me out, that’d be fantastic.

,

You should change fixedUpdate() to FixedUpdate().