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R – resultant surface forces acting on this platform.
Unit of measure   p  P а .
In strength of materials loads that are distributed by volume and
by area, often reduced to the loads distributed by line. This
schematization is useful when considering the forces acting on the
rod (fig. 1.5, a). Measure of the load distributed by line is the
intensity per unit length q (fig.1.5 b):

b
 R
q  lim , R   q   x dx ,
 x0  x a
R
where  – resultant forces per unit length acting on the
length x . Unit of measure [q]=N/m.
If the load of high intensity q acts on a small area, it can be
seen as a concentrated force P (fig.1.5 c).
A couple of forces that has a small shoulder can be seen as the
focused moment attached at the point(fig.1.5, d).

Figure 1.5

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