So I was in the shower today...

[Radical Raccoon]

>So now you have a force of (4.4m/s^2)*(half the mass of the earth) pushing on you from both sides.

You can't just divide the mass of the Earth by two and say the gravitational force on the surface is also halved. Also, m^2/s^2 is not force, it's force times mass.

It's the concept that matters here and not precise calculations.

>thinking that somehow you'd be safe in the middle because there is no gravity. But there is gravity, you're just cancelled out from the (equivAlEnt) mass on both sides.

I didn't say there wasn't gravity. People can't be cancelled out.

Yes they can. Ever played tug-o-war? If both people are pulling equally on both sides then no one's going to move and no one's going to win. Now imagine that you hang a ball at the center of this rope. If you grab one end of the rope while someone else grabs the other, then you both pull in opposite directions with equal strength what happens? The ball doesn't move, not because there is little or no force, but because the forces have cancelled each other out.

So? The force will be small at the center because gravity will be low. Just because everything forces towards everything "below" it doesn't mean that you can somehow add up the forces. You're going to lose a lot of that force from simply the density of matter that stops the force, from magnetism, and also from the much smaller force in the center and near the center.

Gravity is not low at the center. You're not speaking in the right context. It is a common misconception that there is little to no gravity at the center. Though, it is correct that if the center was hollow and you were placed in the center that you wouldn't be effected by the gravity of the surrounding mass. But this doesn't mean that there is little gravity at the center. You'd still have a pull to one side, but the opposite side is also pulling on you just as much; that's why you wouldn't move, not because there is "low" gravity.

Pressure at the center can better be described in terms of vectors. Indeed you do add up the forces. If you don't believe so then you need to learn about the concept of vectors and how they can be applied. Then you'll have a better understanding of this subject and physics in general.