2-Force Members:
Which one is in equilibrium?
Hint - take the moment around either A or B
What does this tell you about members that only have two forces acting on them?
→Ans: the two forces need to be lined up with one another.
Three force members:
Equilibrium requires moment around D = 0
Forces must be concurrent, or parallel.
4.6 - 4.7 (4.61-4.90)
Ex: 4.61, 4.81
HW: 4.62, 4.82,