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There's a lot more to the story. ...
The downward force goes like the cube of the radius.
According to Prof. Stokes, the viscous force depends on ....
As discussed above, thermal zig-zagging is not "the" explanation.
For that matter, for really small particles, they don't fall _at all_.
If you start them out at the bottom, they will diffuse upward.
3) The next step is to create a good quantitative problem
based on the preparatory description.
It depends on what the objective is.