In the above image if one begins with a long square bar of metal it tends to bend when you apply a force in the middle of the bar. However, if I remove a portion of the bar leaving a L shaped bar the newly created angle bar seems to resist that same force and not bend nearly as much (at least has been my experience).
If this is true how can this be? The angle bar exists within the original bar. In fact you would think that leaving the original bar intact would give even more mass to resist the force. If I use an angle bar to strengthen something wouldn't using the entire bar be even better (strength wise)? Of course, you save on material to use an angle bar but why does it seem to be stronger that the original bar from which it is created?