Originally Posted by aeronaut999
Granted. Still-- consider-- does this static pressure difference between top and bottom of box (as measured by barometers) change when the plane is in flight? Does the scale under the box read differently during the zero-G pushover and the 2-G pullout, than when the plane is in 1G flight? I say no to the first and yes to the second.
I would say it has to be different, since the total "weight" of the box is the same if the plane is in your hand or gliding along.
It would also vary as the plane did pushovers and pullouts, just as it would if a motorcycle was doing loops on a vertical circular track. Or if you are throwing a ball up and down. Different mechanisms in each case but the principle is the same.