sphere wont move

i dont know what to do… with this code the sphere wont moive on my plane. I added the rigidbody component but if I press an Arrow key the sphere doesent move.

public class moveplayer : MonoBehaviour
{

void fixedupdate()
{
	float moveHorizontal = Input.GetAxis("horizontal");
	float moveVertical = Input.GetAxis("vertical");

	Vector3 movement = new Vector3(moveHorizontal, 0.0f, moveVertical);
	
	rigidbody.AddForce (movement);
}

}

Change

void fixedupdate()

to

void FixedUpdate()

This method is called by the Unity engine and needs to match exactly.