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Classical Mechanics Level 1

As shown in the picture, water flows from the bottle into the cup. What explains this phenomena?

Details

Note, the picture is upside down. The Earth is in the top of the photo and the bottom of the plane is facing the atmosphere.

Gravity pulls the water down toward the stationary cup. A normal force from the bottle pushes the water out. A bumpy ride due to turbulence forces water from the bottle. The plane and water accelerate toward the Earth, but the plane accelerates faster.