Engineering Mechanics 200-250 Flashcards

1
Q
  1. Each force or couple putted on a free diagram represents a model of how a body is affected by it surroundings.
A

Forces and couples of a free body

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2
Q
  1. It is a structure made of two force members all pin is connected to each other.
A

Truss

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3
Q
  1. A body which has forces applied onto it at only three points and no couples applied onto it at all.
A

A two force member

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4
Q
  1. A body which has forces applied onto it at only three pounts and no couples applied onto it at all.
A

A three force

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5
Q
  1. This method uses free body diagrams of sections of the truss to obtain unknown forces.
A

Method of joints

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6
Q
  1. This method uses free body diagrams of sections of the truss to obtain unknown forces.
A

The method of sections

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7
Q
  1. Some members in the truss which cannot carry load.
A

zero force member

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8
Q
  1. In the free diagram load is directly transmitted from each member to the one opposite without any interaction.
A

A redundant joint

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9
Q
  1. These members must be removed from the truss, other wise one will have an insufficient number of equations
A

Redundant members

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10
Q
  1. Sometimes there is too much freedom in a structure, the following structures cannot carry load since it will collapse under the load.
A

mechanism

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11
Q

211.Two forces acting on a two force member are along the line connecting the two points on which the loads are applied.

A

Curved members

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12
Q
  1. A general triangular object which is placed between two objects to either hold them in place or is used to move one relative to the other.
A

Wedges

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13
Q
  1. It is a combination of a two wedges obtain from the opening the helical treads.
A

screw

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14
Q
  1. If the lead angle is selected such that in the absence of a screwing moment.
A

Self-locking screw

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15
Q
  1. Is the second moment of area around a given axis.
A

Area moment of inertia

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16
Q
  1. Can be calculated if we have a rectangular coordinate system, one can define the area moment of inertial around the axis.
A

Parallel axis theorem

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17
Q
  1. If the distance away from the axis that all the area can be concentrated to result in the some moment of inertia.
A

Radius of gyration

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18
Q
  1. The explicit form of the laws of mechanics depend on this and is used to reference the motions.
A

Inertial frame

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19
Q
  1. Law which governs the motion for a rigid body.
A

Euler’s law

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20
Q
  1. For a single particle of mass its linear momentum by its mass times its velocity.
A

Linear momentum of particle

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21
Q
  1. Is assumed to be the sum of the linear momentum of its particles.
A

linear momentum of a body

22
Q
  1. For a particle of mass is defined as the moment of linear momentum across the point.
A

Angular momentum of a particle

23
Q
  1. A vector itself which has a magnitude equal to the rate of rotation.
A

Angular velocity

24
Q
  1. It is the rate of change of the angular velocity with respect to time.
A

angular acceleration

25
Q
  1. When two surface come into contact forces are applied by each other surface on the other.
A

Friction force

26
Q
  1. The frictional forces that can result between two surfaces slide relative to each other.
A

Static friction

27
Q
  1. The frictional forces that can result when two surfaces are sliding to each other is proportional to the normal force applied on the surface.
A

Kinetic friction

28
Q
  1. Refers to the state just before surfaces start to slip.
A

Pending motion

29
Q
  1. It is a method for predicting failure of a structure containing a crack.
A

Fracture mechanics

30
Q
  1. The study of deformation typically in the elastic range.
A

deformation mechanics

31
Q
  1. It is the study on how fluids react to forces.
A

Fluid mechanics

32
Q
  1. A method of applying mechanics that assumes all objects are continuous.
A

Continuum mechanics

33
Q
  1. Under this condition the forces or vectors are transformed into a polygon.
A

Graphical condition

34
Q
  1. If three or more non-parallel forces or vectors are in equilibrium they must be concurrent.
A

Directional condition

35
Q
  1. If corces or vectors are in equilibrium, then it must satisfy the three static equations.
A

Analytical condition

36
Q
  1. IT is the application of fluid mechanics in engineering.
A

Hydraulics

37
Q
  1. When the loading is uniformly distributed horizontally the cable is analyzed as
A

Parabolic

38
Q
  1. When the loading is distributed along the cable the cable is analyzed as
A

catenary

39
Q
  1. Is one whose action is not confined to or associated with a unique line in space.
A

Free vector

40
Q
  1. Is one for which a unique line in space must be maintained along which the quantity acts.
A

Sliding vector

41
Q
  1. Is one which a unique point of application is specified and therefore the vector occupies a particular position in space.
A

Fixed vector

42
Q
  1. It is defined as the sicence which considers the effects of forces on rigid bodies
A

Engineering mechanics

43
Q
  1. It considers the effects is distributuion of forces on rigid bodies which are and remain at rest.
A

Statics

44
Q
  1. It is defined as a definite amount of matter the parts which are fixed in position relative to each other.
A

Rigid body

45
Q
  1. It is the branch of mechanics which deals with the study of bodies in motion.
A

Dynamics

46
Q
  1. Its is defined as a condition in which the sultant of a system of force is equal to zero.
A

Equilibrium

47
Q
  1. The forces by which determine how the loads applied to a structure are distributed throughout the structure.
A

Analysis of structure

48
Q
  1. In _______ the members are subjected to bending action.
A

Frames

49
Q
  1. In _______ the inter nal force in a bar is directed along the axis of bars.
A

Trusses

50
Q

250 . It may be defines as te contact resistance exerted by one body upon a second body when the second body move or tends to move past the first body.

A

Friction