ENGINEERING MECHANICS Flashcards
When all the forces that act upon an object are balanced, then the object is said to be in a state of ______
equilibrium
The forces are considered to be balanced if the rightward forces are ______ by the leftward forces and the upward forces are _______ by the downward forces.
balanced
is defined as the condition of a body, which is subjected to a force system
whose resultant force is equal to zero
equilibrium
means that the forces intersect through a single point.
Concurrent
If forces are ______, we can add them together as vectors to get the resultant.
concurrent
If the body is not accelerating, it must be in _______ , so that means the resultant is ___.
equilibrium, zero
the body is a point
concurrent forces
So for concurrent forces in equilibrium, the forces should all _____________
add up to give zero.
is the process by which we determine how the loads applied to a structure are distributed throughout the structure.
analysis of structure
Although there are many kinds of structures, we limit ourselves here to pin connected types
analysis of structure
those that consist of assemblages of bars fastened together by smooth bolts.
pin connected types
Our purpose is to determine the forces acting in the bars and upon the pins or hinges of the structures.
Structural analysis
In subsequent courses we shall learn how to determine the dimensions of various parts of a structure so they can safely resist these forces.
is the determination of the effects of loads on physical structures and their components.
Structural analysis
Structures subject to this type of analysis include all that must withstand loads, such as (buildings, bridges, aircraft and ships.)
Structural analysis
employs the fields of applied mechanics, material science and applied mathematics to compute a structure’s deformations internal forces, stresses, support reactions, accelerations, and stability.
Structural analysis
The results of the analysis are used to verify a structure’s fitness for use, often precluding physical tests.
Structural analysis
is thus a key part of the engineering design structures
Structural analysis
consists of several bars laying in one plane and connected by hinges or pins at their ends so as to provide a stable configuration.
plane truss or frame
are used in the roofs of sheds at Railway platform, workshops and in industrial buildings, bridges etc.
Frames
are made of short thin members interconnected at hinges into triangulated patterns.
Plane trusses
