Where Should I Section for Drawing Shear and Moment Diagrams in 2D?

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I'm about to draw shear and moment diagram in 2D, and I wonder if there are any general rules as where to section for instance this ski?

http://www.badongo.com/pic/504635
 
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What do you mean by "as where to section"?
 
Where to make the sections.
 
I guess it depends on you want, but in this case there will be 4 moment equations (sections).
 
To solve this, I first used the units to work out that a= m* a/m, i.e. t=z/λ. This would allow you to determine the time duration within an interval section by section and then add this to the previous ones to obtain the age of the respective layer. However, this would require a constant thickness per year for each interval. However, since this is most likely not the case, my next consideration was that the age must be the integral of a 1/λ(z) function, which I cannot model.

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