4.8-4.9










4.8 - 4.9 (4.91-4.141)

Ex: 4.91, 4.100, 4.107, 4.117

HW: 4.94, 4.105, 4.133










4.6-4.7

 
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,
 
 
 

 
 
 
 

4.1-4.5

 























 
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