Why must the forces applied at the vertices only be in the vertical direction?


This is more for programming convenience than programming impossibility.  The program could, with some difficulty, be modified to accept forces applied at the vertices at any angle, but once again, I choose to start simple and work up from there.  Angled vertex forces weren’t a priority.  Additionally, there are many situations were only vertical forces are being applied at the vertices, so the program is still useful.
 
 

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