What I don't understand is that this "theory" seems really easy to disprove. Why do things travel down instead of up or right or left?
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Because as soon as you stop accelerating upwards, you wouldn't be pushed downwards.
Like when you're moving along at 60 miles an hour on the freeway you aren't pinned to your seat but a hard launch from a red-light you are.
Wouldn't it make more sense to say the Earth is falling downward not moving upward?
Essentially, you're moving downward and the only reason you don't fall off the Earth in an upward manner is that you're more dense than what's above you. When you jump, you get pushed downward because everything is already moving downward and since you're more dense than air, the air pushes you down. It's like jumping into wind. Say wind (air) is moving to the left. If you jump to the right, you will move to the right until the wind eventually stops your movement and then it pushes you to the left because you are more dense than air and thus you naturally want to go to the left when air is moving to the left itself.
This would then make your model work, would it not?
No.
a) The earth is not flat.
b) The earth has a massive molten ball of iron at it's core and is pulling everything toward it.
c) Look at any galaxy. They all form a ball in the middle and all its stars are pulled towards the core.
No matter where you go on the surface, you will always experience (relatively) the same force and therefore you cannot escape gravity's pull. Water is pulled in the same manner which is why it curves around the ball surface, like an ocean. The earth has no edge. If it did, it would collapse under its own weight. as the mass in the center would find the weakest part of the edge and rip it off. Eventually, all the edges would fold in on itself and form a ball - in its attempt to find its 'equalibreum'