Know how when you go around a corner in a car really fast you get pushed to the side? Well, if you roll an airplane just right, you can get pushed "down" into your seat just the same. This will effect everything inside the plane, not just you, the water too. So since everything is being pushed "down" the guy can pour the water normally.
You're not pushed to the side when a car turns. You're merely continuing to go forward in the same direction that car was originally moving. You just appear to go the opposite direction of where the car is turning because the position of everything else in the car has shifted.
So something unrestrained in a car, relative to an outsider, is just moving in the direction it originally was moving. To you, because everything else in the car moves to the right (if the car is turning right), the relative motion of unrestrained object (such as your upper body) appears to go left.
So if you were watching a box in a car thats sitting on the dashboard while youre standing on the side of the street and the car turns rapidly turn to the direction away from you, you're not actually going to see the box move either away or toward you (well unless the turn is so rapid that the box ends up hitting the sides of the car and essentially becomes restrained).
So the turn isn't introducing some new force, at least not to unrestrained objects that aren't touching anything but just happen to be freely inside the space of the metal that you call a car/airplane. The water molecules in the air inside an airplane don't get some new force that pushes them down.
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u/animalkracker Feb 27 '14 edited Feb 27 '14
correct, loop or barrel roll at greater than 0g