Here is a graphical representation of the force created by a moving object. The force, actually velocity, is always in a straight line. In the case of the spinning space station in that animation below. You can see that Mr. Bill, does not fall into the floor. But rather the space station floor gets in Mr. Bill's way. That is what creates the artificial gravity in a spinning vessel.
You can go to Great Adventure, I believe they still have a room that spins and sticks you to the wall. The floor drops out and you are stuck to the wall. I went on it once. It is pretty cool. Your body is trying to move in a straight line and the round path of the wall you are up against, gets in your way. This creates the force you feel.
The faster you go the more velocity you have to effect or alter, to deter you from a straight path.
http://www.Rockwelder.com/Flash/mrbi...mrbill8x6.html
But you should be able to see that once you set an object in motion, it travels nicely in a straight line.
The planet removes gravity rays leaving the earths surface, so that things are pushed more, to the surface by gravity.
There is a constant force upon a moving object orbiting the earth.
There is an exact height above the earth. That gravity will apply a force that exactly positively accelerates an object towards the earth, so that it does not fall, or leave the orbit around the planet.
It is just a ratio of velocity to elevation.
Sincerely,
William McCormick