final exam review answer key...final exam review answer key 1) a planar truss which begins with a...

Final Exam Review Answer Key

1) A planar truss which begins with a triangular element and can be expanded by adding two

members and a joint is called Simple Truss.

2) True

3) If three members of a truss form a joint for which two of the members are colinear, equal and

opposite and there is no external/support reaction, then the third member is a zero-force

member.

4) False. When doing the method of sections, you will often have to find the support reactions in

order to solve.

5) Frames are generally stationary and support external loads.

6) Machines are structure that contain moving parts and that are designed to alter the effect of

forces.

7) The typical internal loads of a two-dimensional case are the normal force (N), the shear force

(V), and the bending moment (M).

8) False. When taking the left side of a cut, standard sign convention has the shear pointed down

and the moment going counterclockwise.

9) False. When taking a cut for shear and bending, you can’t make a cut when there is a change in

how the beam is loaded. (I.E. at a point load, at the end of a distributed load, where a

distributed load changes)

10) False. The shear force of a beam is the integral of the bending moment.

11) True. The diagrams can be found through geometry.

12)

13) For a three-dimensional problem, the normal force, shear force, and bending moment acts on

the centroid of the cut’s cross-sectional area.

14) Forces acting upon a two-force member that is in equilibrium must be colinear and equal

and opposite.

15) Forces acting upon a three-force member that is in equilibrium must form a concurrent

force system or a parallel force system. 16) A concurrent force system is a system where every line of action of every force acting upon it

intersect at a common point.

17) A coplanar force system is a system in which forces are only acting in the same plane, i.e x-y

plane (2-D).


18) A parallel force system is a system where every force is acting parallel to each other, meaning

that the resultant force and the resultant moment will be perpendicular to each other.

19) The magnitude of a unit vector is always 1 and it is dimensionless.

20) True

21) When given a mass like slugs, you must multiple it by an acceleration (in this case gravity,

32.2ft/sec2) to get a force.

22) The dot product of two vectors will result in a scalar.

23) The moment of a force passing through the origin of rotation is zero.

final exam review answer key...final exam review answer key 1) a planar truss which begins with a...

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