$5\mathrm{.}2\mathrm{.}1$F$-$G

Learning Goal:

To learn to apply the method of joints to a truss in a systematic way and thereby

find the loading in each member of the truss.

In analyzing or designing trusses, it is necessary to determine the force in each

member of the truss. One way to do this is the method of joints. The method of

joints is based on the fact that if the entire truss is in equilibrium, each joint in

the truss must also be in equilibrium $($i$.$e$.,$ the free$-$body diagram of each joint

must be balanced$).$

Consider the truss shown in the diagram. The applied forces are P$1=650$ lb and

$P2=370lb$ and the distance is $d=8\mathrm{.}50ft.$

$($Figure $1)$

Part $F-$ The Forces in the Members at Joint $B$

Having found $F_{CD}$ in the analysis of joint $C$ and $F_{DB}$ in the analysis of joint $D,$ there are now only two unknown forces acting on

joint $B.$ Determine the two unknown forces on joint $B.$

Express the magnitudes of the forces to three significant figures. Separate your answers with a comma.

View Available Hint$($s$)$

Part G $-$ The Sense of the Forces

State if the members considered in part $F$ are in tension or compression.

Complete each sentence by dragging the appropriate word into the blank. The words can be used more than once.

Member $BA$ is in

Member $BE$ is in