Note: No aids are allowed for part 1. One side of a letter sized paper with notes is allowed
during part 2, along with a silent, non-programmable calculator. There are no reference charts
for part 2.
Clearly show your work and answer.
Part 1) Worth 5 points
(conceptual questions)
Part 2) Worth 45 points
(NOTE: The units, dimensions, and loading for the
truss can and will be changed for the quiz!) The
points or member forces can be changed as well,
as indicated by the brackets.)
The free body diagram is a truss anchored to a wall
at the point A and supported with a strut out of
point D. There are two forces applied at point C.
Find:
a) The resultant components from the forces at
point C [or B...] (size and direction).
b) The resultant force from the forces at point C [or
B...] (size and angle to +x axis).
c) The member forces and senses (compression or tension) of BC and AC [or AB and BC or AB and
AC...] of the truss.
Answers – Not provided on actual quiz!
a) RCx = -176.1 N (left), RCy = -2281.1 N (down) [or RBx = -3174.4 N (left), RBy = 2521.0 N (up)...]
b) R = 2287.9 N, = -94.4 (or 265.6) [or R = 4053.7 N, = 141.5]
c) BC = 4218.3 N (T), AC = -3724.5 N (C) [or AB = 444.1 N (T)...]
3351 N
12
2200 N
A
2.7 m
800 N
94
4.2 m
B
C
D
4.2 m
x
4181 N
240 N
3.6 m
200 N
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