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A simple example is that a flat metal file can be used in metal working to file down (smooth) rough edges on a piece of metal.
The flat faces of a piece of shale could be quite smooth, but the broken edges can be quite rough.
flat
The opposite of flat is bumpy and rough.
Evaporation is faster in a flat tray.
a power feed drum sander
They can touch down on both flat and rough land.
Use MineEdit.
2 seconds flat in major league by Jacoby Elisbury.
rough sanding flat surfaces
A plain is a large piece of flat land.
Flat piece of inscribed metal given as an honor or reward