# POE 2.1

A strong rope, usually made of metal, designed to have great tensile strength and to be used in structures.
Cable
The geometric center of an area.
Centroid
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A body subjected to a push.
Compression Force
A force system where all of the forces are applied at a common point on the body or having their lines of action with a common intersection point.
Concurrent Force Systems
A surface or shape exposed by making a straight cut through something at right angles to the axis.
Cross-Sectional Area
The direction of a vector is defined by the angle between a reference axis and the arrow’s line of direction.
Direction
A support that prevents translation and rotation in a beam.
Fixed Support
A broad ridge or pair of ridges projecting at a right angle from the edge of a structural shape in order to strengthen or stiffen it.
Flange
A diagram used to isolate a body from its environment, showing all external forces acting upon it.
Free Body Diagram
A plate or bracket for strengthening an angle in framework.
Gusset
The connection points of members of a truss
Joint
The absolute value of a number
Magnitude
Slender straight pieces of a truss connected by joints.
Member
A method of analysis of trusses which constructs free body diagrams of each joint and determines the forces acting in that joint by considering equilibrium of the joint pin.
Method of Joints
The turning effect of a force about a point equal to the magnitude of the force times the perpendicular distance from the point to the line of action from the force.
Moment
A mathematical property of a cross section that is concerned with a surface area and how that area is distributed about a centroidal axis.
Moment of Inertia
Every body or particle continues at a state of rest or uniform motion in a straight line, unless it is compelled to change that state by forces acting upon it.
Newton’s First Law
The change of motion of the body is proportional to the net force imposed on the body and is in the direction of the net force.
Newton’s Second Law
if one object exerts a force on another object, then the second object exerts a force of equal streangth in the opposite direction on the first object.
Newton’s Third Law
A support that prevents translation in any direction
Pinned Support
A truss that lies in a single plane often used to support roofs and bridges.
Planar Truss
The resultant of a system of force is the vector sum of all forces.
Resultant Force
A support that only prevents a beam from translating in one direction.
Roller Support
A physical quantity that has magnitude only.
Scalar
The sense of a vector is the direction of the vector relative to its path and indicated by the location of the arrow.
Sense
A truss composed of triangles, which will retain its shape even when removed from supports.
Simple Truss
A condition where there are no net external forces acting upon a particle or rigid body and the body remains at rest or continues at a constant velocity.
Static Equilibrium
A structure or body which is over-constrained such that there are more unknown supports than there are equations of static equilibrium.
Statically Indeterminate
Something made up of interdependent parts in a definite pattern of organization, such as trusses, frames, or machines.
Structure
A body subjected to a pull.
Tension Force
A quantity that has both a magnitude and direction.
Vector Quantity

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