A very simple moments question

[A.T.]

For small angle the large downward force at the wall contact point and the large upward force at the diagonal rod point both go to infinity in your calculation. Is it OK?

OK in what sense? It's not good engineering to make that angle too small.

 

[anuttarasammyak]

The jig would undertake a big torsion and the screw to attach the jig to the wall would break by the large upward force’s torsion, right?

 

[A.T.]

The jig would undertake a big torsion and the screw to attach the jig to the wall would break by the large upward force’s torsion, right?

What would break first depends on the material properties.

 

[anuttarasammyak]

So anyway the screw undertakes larger torsion caused by larger upward force from the jig in the smaller angle case, right?