Given that $P_1=5N$ is applied to joint $D_1{P}_2=8N$ is applied to joint $C_2{P}_3=5N$ is applied to joint $E_{,}$ and $P_4=8N$ is applied to joint $B$ if $A=4.$ determine the force in members BF$,$ BG$,$ and AB$.$ Indicate if the members are in tension or compression. Assume tension to be positive.

Note: Joint $A$ is connected to a pin and foint $Q$ is connected to a roller.