Three books labeled $A,B,$ and $C$ are at rest on a flat, horizontal surface when downward force $F$ is applied

to the top book as shown. Select all forces that must be included on a free body diagram if the system

consists of Book C$.$ Assume each book has a unique weight $W_i$ that acts at its center of gravity.

Note: the normal force labeling convention $ij$ indicates the force body i exerts on body $j.$ Also, be

aware that full credit for this problem requires correct submissions to more than one iteration of the

problem.

F

$W_A$

$W_B$

$W_C$

$F_{N_{AB}}$

$F_{N_{BA}}$

$F_{N_{BC}}$

$F_{N_{CB}}$

$F_{N_{GG}}$

$F_{N_{GC}}$