Disparar proyectil

using UnityEngine;
using System.Collections;

public class disparo : MonoBehaviour {

public GameObject bala;

// Use this for initialization
void Start () {



}

// Update is called once per frame
void Update () {

if (Input.GetKeyDown ("space")) {
Instantiate (bala, transform.position, Quaternion.identity);
}

}
}

Movimiento Lateral

using UnityEngine;
using System.Collections;

public class playercontroller : MonoBehaviour {

float movimiento, velocidad;


// Use this for initialization
void Start () {

velocidad = 5;

}

// Update is called once per frame
void Update () {

movimiento = Input.GetAxis ("Horizontal");
GetComponent<Rigidbody> ().velocity = new Vector3 (movimiento * velocidad, GetComponent<Rigidbody> ().velocity.y);

}
}

AddForce

using UnityEngine;
using System.Collections;

public class fuerza : MonoBehaviour {

public GameObject bala;
public int velocidad;

void Start()
{

velocidad = 100;

}

void FixedUpdate()
{
bala.GetComponent<Rigidbody> ().AddForce (Vector3.forward * velocidad);

}
}