$\sum _{}{\mathrm{F}}_{\mathrm{y}}={\mathrm{F}}_1-{\mathrm{F}}_2=0$

There are two unknowns (i.e., ${\mathrm{F}}_1$ and ${\mathrm{F}}_2$) in this equation. Two unknowns cannot be determined from a single equation. Consequently, equilibrium alone does not provide enough information to solve this problem. Problems like this are called statically indeterminate.

A second equation in terms of ${\mathrm{F}}_1$ and ${\mathrm{F}}_2$ is required. To develop such an equation, the deformations that occur in this structure will be considered.