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Re:Tell HN: Rejected from App Store - "customer damaging the... by cdibona on Sunday February 13, 2011 @12:13PM (#2213185)
I'm not saying this is a good idea, but:

"Similarly, when the device is in free-fall and therefore dangerously accelerating towards to ground at 9.81 m/s^2, its accelerometer reads a magnitude of 0 m/s^2."

http://developer.android.com/reference/android/hardware/Sens...

Re:Tell HN: Rejected from App Store - "customer damaging the... by Maro on Sunday February 13, 2011 @01:00PM (#2213304)
That's Einstein's equivalence principle:

"The outcome of any local non-gravitational experiment in a freely falling laboratory is independent of the velocity of the laboratory and its location in spacetime."

http://en.wikipedia.org/wiki/Equivalence_principle