Question

friction depends on surfaces

Answer 1

yes friction depends upon surfaces.
more the smooth surface less will be the friction ie inversely proportional.
whereas more the rough surface more will be the friction ie directly proportional

Answer 2

Since pressure equals force divided by the area of contact, it works out that the increase in friction generating area is exactly offset by the reduction in pressure; the resulting frictional forces, then, are dependent only on the frictional coefficient of the materials and the FORCE holding them together.