Equilibrium Flashcards
1
Q
The condition for two forces are acting on a body if at equilibrium
A
- Acting equal and opposite
- Same line of action
2
Q
The condition for three forces are acting on a body if at equilibrium
A
Lines of action intersect at a single point
OR
Lines of action are parallel
3
Q
Define simple truss
A
The number of members (m), and the number of joints (j) follow the equation
m = 2j - 3
4
Q
What are characteristics of simple trusses
A
statically determinate
rigid
5
Q
Define statically determinate
A
all reactions forces can be found from equilibrium equations
6
Q
Which parts of a truss do we take loads to act
A
Only at members (pins), where the structure is supported
7
Q
Method to solving truss forces
A
- assign tensions to members
- solve for reactions, by considering whole body
- segregate joints, simple first
8
Q
What does a negative number means when looking at tensions
A
Compression
