Misconceptions Many texbooks make an assumption that ice is a frictionless surface: this is entirely untrue. People mistake ice for being frictionless because the ice seems to be a transparent, flat and smooth (it's slippery when you run your hand across the ice).
"At a macroscopic level, smooth surfaces exert frictional forces at least as large as do rough ones." (Sir Robert Robinson, 1965, p. 110)
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