1. The internal axial force will be determined in both member $\left(1\right)$ (i.e., the upper portion of the column between $\mathrm{B}$ and $\mathrm{C}$) and member $\left(2\right)$ (i.e., the lower portion of the column between $\mathrm{A}$ and $\mathrm{B}$).

   This is done by drawing free-body diagrams that expose the internal forces in each member.