Puzzling difference between running in Unity and running on iPad

Hi,
I'm very new to unity, (and first time poster) so may be missing something:

I have a small game using 2d physics where I apply a force to a sprite that then rolls along a 2d physics hilly surface,
Running inside Unity, it constantly accelerates and eventually jumps off the top of hills.

But I built it for IOS and ran it on an iPad mini, and while it seems to run fine, the sprite doesn't accelerate as fast, and indeed doesn't go fast enough to reach the top of the hill!

(When I ran it on the emulator for iPhone it never seemed to accelerate at all, just falling to the floor and sitting there)

The only things I can think of are:

a) The graphical resolution means on the iPad the sprite is more 'dense' and so a greater force would be needed to move it.
b) The processor speed is somehow affecting the force - e.g. on the PC it is applying the force 144 time a second, on the iPad only 30?
c) I'm doing something wrong.

As c) seems exceedingly unlikely ...

Here's the code from my Player...

Code (CSharp):

1.     private GameObject player;
2.     private Rigidbody2D body;
3.  
4.     // Use this for initialization
5.     void Start () {
6.         player = GameObject.Find("Player");
7.         body = player.GetComponent<Rigidbody2D>();
8.     }
9.    
10.     // Update is called once per frame
11.     void Update () {
12.         body.AddForce(new Vector2(2, 0));
13.     }
14. }

Any suggestions?

 

Update runs every frame, and should not be used for physics. You can't count on the framerate being consistent under any circumstances.

--Eric

 

Thanks @Eric5h5 and @JeffDUnity3D.

I didn't get an email when you responded - so only just saw your replies. Thanks.
I will give this a go!

 

Thanks @Eric5h5 and @JeffDUnity3D.
100% perfect.