reduce air resistance
to reduce air resistance
smooth surface
smooth surfaces
Smooth vs. Rough surfaces. Rough surfaces have more surface area than smooth surfaces. This means that there are increased incidences of molecular reactions between the surface and object
Smooth
Because friction is less on smooth surfaces. Smoother the surfaces, lesser the friction.
There is more friction between the surfaces of 2 smooth surfaces than one smooth surface because there is more surface area.
Some friction will occur on smooth surfaces because even the smoothest of surfaces isn't completely smooth. There are bumps and cracks on the face of the surface when "zooming in" to a microscopic level.
sound wave reflect best off smooth, hard surfaces
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True.
You can see yourself in smooth and polished surfaces because the surface is clean and not blurry. Also, you can't see yourself in certain smooth and polished surfaces, such as tan desks.