Final answer:
The student's statement is likely illustrating the effects of rough surfaces on aerodynamics, related to the concept that different surfaces have varying levels of friction. It is true that friction varies with surface roughness.
Step-by-step explanation:
The statement indicates that ice, snow, or frost can have a surface roughness similar to medium or coarse sandpaper, particularly on the leading edge and upper surface of an airfoil. This comparison is likely meant to illustrate the potential effects on aerodynamics and the importance of ensuring these surfaces are clear of such obstructions when flying. Friction, surface roughness, and phase changes of water are all relevant aspects here.
True or False: Friction varies from surface to surface because different substances have different degrees of roughness or smoothness. The statement is true, as two different surfaces can have varying levels of friction which is influenced by their roughness or smoothness.