Question

I have a hollow sphere filled with water. I roll it on a smooth surface and a rough surface. Will the water inside the sphere rotate in any of the cases? Will the rotation of the water inside the sphere depend on the velocity with which the it is rolled?

Answer 1

Yes, the fluid placed inside the hollow sphere will spin inside it if you roll the sphere.
the factors that affect the velocity of the fluid will be.
* amount of fluid placed. more fluid will mean that the water will not splash inside meaning less turbulence.
* the viscosity of the fluid, if the fluid is more viscous it will stick to the wall of the sphere and move closer to the velocity of the sphere. but if it less viscous it will not move as fast.

I hope this solves your doubt,