How to use Input.accelration for moving the board in labyrinth

How to use Input.acceleration for moving the board in labyrinth for mobile movement handling

below code snippet for the same // Physics.gravity = new Vector3 (Input.acceleration.x,Input.acceleration.y,Input.acceleration.z)*g; or //transform.Rotate (0,Input.acceleration.y,0);

Wen i uncommented the 2nd part the board keeps moving in certain direction indefinitely.I am still trying to fix it .If somebody can look into this i will be grateful to him/her.

Thanks,