Three new surface finishes for as-cast formed concrete are defined in the new ACI 301-10 Specifications for Structural Concrete, which supersedes ACI 301-05. Rough-Form and Smooth-Form As-Cast ...

Coarse and smooth areas can occur on the same surface, both in modern and artifact samples. Especially evident on coarse (rough) surfaces are topographic differences with deeper interstices (Figure 1) ...

Earlier, we saw that the work done by friction on a particle sliding on a rough surface is negative, causing a loss in total mechanical energy as the particle slides. Here, we will address the ...

If the surfaces are smooth, there is less friction. If the surfaces are rough, there is more friction. If you rub your hands together quickly, you can feel them heat up. That’s caused by friction.