Above answers are fine. Just one more point that I would like to add to above answers is that smoothness doesn't always imply a low coefficient of friction. Since friction is not a fundamental force and it has electrostatic origins (read Feynman lectures on frictional forces), a highly smooth surface increase frictional forces between the objects as it brings atoms closer enough to interact with each other.

Rest answers are fine. Just one more point that I would like to add to them is that smoothness doesn't always imply a low coefficient of friction. Since friction is not a fundamental force and it has electrostatic origins (read Feynman lectures on frictional forces), a highly smooth surface increase frictional forces between the objects as it brings atoms closer enough to interact with each other.

Above answers are fine. Just one more point. I would add to above answers that smoothness doesn't always imply a low coefficient of friction. Since friction is not a fundamental force and it has electrostatic origins (read Feynman lectures on frictional forces), a highly smooth surface increase frictional forces between the objects as it brings atoms closer enough to interact with each other.

Above answers are fine. Just one more point that I would like to add to above answers is that smoothness doesn't always imply a low coefficient of friction. Since friction is not a fundamental force and it has electrostatic origins (read Feynman lectures on frictional forces), a highly smooth surface increase frictional forces between the objects as it brings atoms closer enough to interact with each other.