2-1 Technology – the practical use of human knowledge to extend abilities, satisfy needs and wants, and solve problems.

2-2 Engineer -applies scientific knowledge, mathematics, and ingenuity to develop technical solutions for problems facing mankind. 

2-3 Invention- is a unique device, method, composition, process or discovery that  did not exist previously.

2-6 Innovation – An improvement to an existing invention. Better solutions that meet new requirements, or existing market needs.

2-7 Obsolete technology - outdated computer hardware, software, or other technology that is no longer used, even if they are in working condition. A technology often becomes obsolete when replaced by newer or better technology.

2-8 Customary measurement system – The customary measurement system is the system of measurement in the United States. This system measures length in inches, feet, yards, and miles; capacity in cups, pints, quarts, and gallons; weight in pounds, and tons; and temperature in degree Fahrenheit.

2-9 Ruler - A ruler, sometimes called a rule or line gauge, is a device used in geometry and technical drawing, as well as the engineering and construction industries, to measure or draw straight lines.

2-13  - inch - The smallest whole unit of length measurement in the customary system, with measurements smaller than an inch being stated using the fractions 1/2, 1/4 , 1/8,and 1/16.  The symbol for inch is "

2-14 Bridge - a structure built to span physical obstacles such as a body of water, valley, or road, for the purpose of providing passage over the obstacle

2-15 Beam bridge -  the simplest structural forms for bridge spans supported by an abutment or pier at each end. The beam bridge supports the least amount of weight and is best for short distances.

2-16  Truss - is a framework of one or more triangles constructed with straight members. The simplest form of a truss is one single triangle as seen in a framed roof.

2-21 Force - strength or energy as an attribute of physical action or movement.

2-22 Symmetry -means a mirror image -- one side is the mirror image of the other. Symmetry can occur in any orientation as long as the image is the same on either side of the central axis.

2-23 Suspension bridge -a bridge in which the weight of the deck is supported by vertical cables suspended from larger cables that run between towers and are anchored in abutments at each end.

2-24 -Cable-stayed bridge - a bridge in which the weight of the deck is supported by a number of cables running directly to one or more towers.

2-27 – Scale Model  - a representation or copy of an object that is larger or smaller than the actual size of the object being represented.

3-1 Span - Part of a bridge between two supports. The span will often determine the type of bridge that will be built. As the span increases, so does the cost.

3-2 Load - The weight or force on a joint, connection, beam, column, etc.  Load is the biggest engineering factor when designing any structural element.

3-3 Live load - The dynamic or moving weight, such as vehicles, people, or snow, that has to be carried by a structure.

3-7 Dead Load - The weight of a structure itself is called.

3-8 Cantilever - A horizontal member fixed at one end and free at the other.

3-9 Civil engineer - designs and supervises large construction projects, including roads, buildings, airports, tunnels, dams, bridges, and systems for water supply and sewage treatment.