MAE 2101 Statics
Exam #2
Methods of Joints & Sections; internal forces; shear & moment diagrams; friction
Show all work for partial credit. Attach your own paper, if necessary. Remember to specify units
and indicate sign or direction, where appropriate.
1. (25 pts) Determine the
force in members CD, FD,
and FE of the truss and
state if the members are in
tension or compression.
Bonus (10 pts): Find the
forces in the rest of the
members, and state if they are
in tension or compression.
2. (25 pts) Find the internal
shear and bending moment
(a) at D, and (b) just to the
right of the 4 kip force at
E..
R. Gist
1
MAE 2101 Statics
Exam #2
Methods of Joints & Sections; internal forces; shear & moment diagrams; friction
3. (25 pts) Draw the shear and
moment diagrams for the beam
subjected to the forces and loads
shown. Denote locations and
magnitudes of maxima, minima,
and zero crossings.
4. (25 pts) Find the minimum
force P the man must exert in
order to cause the refrigerator to
begin to move. Assume that the
coefficient of friction between
the fridge and the floor is μs=0.3
and that the fridge weighs 250
lbs with center of gravity at G.
Does the refrigerator slide or tip
over? (Defend your answer.)
Bonus (15 pts)
Given that block A weighs 5 lb,
block B weighs 10 lbs and block C
weighs 15 lbs, what tension, (T1), is
required to cause block C to move?
What must be the tension (T2)
applied to the cord passing over the
drum D to create tension T1?
(Assume that β=90o for the cord’s
contact over the drum.)
R. Gist
2