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## Statics , Chapter 9 , Self_Test

This is a multiple choice test with one correct choice per question.

1. A 2-force member is a part of a larger structure and is

is attached to other members at just a single point
is attached to other members at only two points
has only 2 forces acting on it

2. A 2-force member is always

under tension
under compression
a zero-force member
one of the above

3. The resultant of all forces acting on one endpoint and the resultant of all forces acting on the other endpoint of a 2-force member are :

equal in magnitude and point in the same direction
equal in magnitude and point in arbitrary direction
are not related to each other at all
their lines of action coincide with the line connecting the two end-points

4. In the analysis of trusses the weight of its members :

cannot be taken into consideration
is to be represented by a single force at their center of gravity
is to be represented by two forces, one at either end-point, each equals half the weight.

5. In order to determine the internal and support forces on a 2-dimensional truss by the Method of Joints, which of the following conditions has to be satisfied :

the number of joints equals the number of members
2 times the number of joints equals the number of members
2 times the number of joints equals the number of members plus the number of components of the support forces
2 times the number of joints equals the number of members
plus the number of external forces

6. In order to determine the internal and support forces on a 2-dimensional truss by the Method of Section, which of the following conditions has to be satisfied :

the number of joints equals the number of members
2 times the number of joints equals the number of members
2 times the number of joints equals the number of members plus the number of components of the support forces
2 times the number of joints equals the number of members
plus the number of external forces

7. For 2-dimensional trusses the Method of Section when applied once yields the force of how many internal members ?

Never more than 3
always exactly 1
always exactly 2
always exactly 3
as many as you like

8. The equilibrium on a joint in 2-dimensional trusses give you how many independent algebraic equations ?

you never know
1
2
up to three

9. The equilibrium equations on a 2-dimensional truss as a whole yield how many independent algebraic equations ?

you never know
1
2
3

10. When applying the Method of Section to 2-dimensional trusses you have to remove how many members ?

at most 3
always exactly 3
never more than 2

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Zig Herzog; hgn@psu.edu
Last revised: 12/07/00