Do all forces act in the same way where gravity is close to zero?

Question

Suppose that I put in the outer space (where gravity from other bodies is negligible) a large, perfectly round sphere totally filled with water. At the bottom (even though "bottom" doesn't make much sense in the deep space) of the sphere there are several marbles, all touching each other.

If I make rotate the sphere, all marbles should stay exactly where they are. Right? Is that true regardless of the force that I apply? And what happens, instead, if I strongly shake the sphere?

Answer 1

Wrong. You are neglecting the viscosity of the water. Friction from the inner wall of the sphere will move the water, which will in turn move the marbles and they will likely rotate around the sphere, though at a speed slower than the rotation of the sphere.

If your sphere was on Earth, then the only reason the marbles stay at the bottom is gravity pulling them down.

If you shake the sphere (even assuming that the walls do not touch the marbles), then they will move in this situation too due to the force of the water flowing around the sphere.