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Originally Posted by camacazio
The macroscopic approximation for it is simply a constant related to the type of materials in contact and proportional to the normal force of the object.
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You can see here that he's already defined his frictional force as the equation F=mg(nu) right off the bat. This should be fine for large sized object, and that's probably why he's using it. Of course molecules do get pushed around, but I would think that any that move with the ship would be too small to matter.