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Gravity is assumed to act from the centre of the planet so digging down wouldn't effect it in the wya of equations but thinking logically it should have some effect on it.
If you going upwards at a constant speed you'l notice no differences from gravity (unless your travelling so fast that the earth is no longer effecting you) [again i say you'll not notice, if say you were an atomic clock instead of an TFP poster you might notice there's a change in g at altitude].
As you go upwards you are gaining potential energy faster BUT the floor is going up and that's providing the power.
if you were accelaerating upwards at 9.9081 m/s^2 your weight would be twice as much (although your mass is constant).
If travelling at 45 degrees upwards you'd need to accelating at root (9.9801^2 + 9.9801^2) which is 14.11m/s^2.
The gravity constants are from my head so may be wrong but are in the right ball park for figures. Hope this helps somewhatt.
I always liked to imagine a hole through the centre of the earth that you could jump through and experience simple harmonic motion, but then again I don't get to sleep alot and have time on my hands! Hope this helped.
Insom
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Insomniac
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