Engineering
Engineering turns requirements into systems that must work under real constraints. Choose the kind of system you want to design, then follow the evidence from need to model, prototype, verification, and iteration.
Which system are you trying to make behave?
One requirement, one test, one visible margin.
How much margin remains between demand and resistance?
Change the applied load or specimen profile. The lab compares demand with an illustrative design resistance and reports a safety factor. The bending drawing is a teaching visualization, not a finite-element result.
Real capacity depends on geometry, material behavior, connections, buckling, fatigue, load combinations, uncertainty, codes, and failure mode. The specimen numbers below are intentionally illustrative rather than material constants.
The illustrative resistance exceeds the selected demand with visible margin. Passing one check is not the same as proving the whole design is safe, reliable, manufacturable, or fit for service.
An optimum in one dimension can be a bad design overall.
Engineering decisions are usually multi-objective. Higher performance may raise cost, lower mass may reduce robustness, extra redundancy may increase complexity, and a safe component can still belong to an unsafe system.