something about Accelerometer in Android device

hi ,everyone,i just write the code piece as follows:

void Update () {
        transform.Translate (Input.acceleration.x*Time.deltaTime*5,
                             0,
                             -Input.acceleration.z*Time.deltaTime*5);
    }

and i attached it to a cube in my scene.
it works well when i tilted my device along z axis,but it didn’t work when i tilted my mobile along x axis.
so could anyone tell me why?:sunglasses:

oh,the reason is i set the camera’s projection mode to be orthogonal,so it looks like nothing happening when i tilled along x axis!