I and my brother are having an argument on gravity on a space ship. For this argument lets say, you are in a void. There are no outside gravity forces, ie planets or solar systems in the near region. You have made a gravity force on your space ship, for example like in the Star Trek, just not as advanced. My argument is if you were to accelerate, you would not be pulled back because you are attached to the gravity of the ship.
There would be no kind of force/gravity pulling you back, so you could go from 1 mph-1000 mph in 1 second, and not be pulled back. My brother thinks, you would be thrown back. The only way I would see this happening is, if the initial acceleration was making a gravitational force pulling you back.
If so would be, could the antigravity around the ship counteract this?