For figure $2$ below,

$($a$)$ Draw an FBD for beam AB and solve for all reactions at A in terms of $w,L,$ and $P.$

$($b$)$ Draw shear and bending moment diagrams for beam AB if the shear at $\frac{L}{2}$ is $0.$ Label

any interesting points $($locations of zero shear$/$bending moment, most positive and most

negative shear and bending moment, etc.$).$

$($c$)$ Draw shear and bending moment diagrams for beam AB if the bending moment at $\frac{L}{2}$ is

$0.$ Label any interesting points $($locations of zero shear$/$bending moment, most positive

and most negative shear and bending moment, etc.$).$