Technology 9 November Flashcards
What is an Outline
All parts of the object that are visible
What is a Dimension line
These describe the size
What is a Hidden detail?
Parts of an object that is not visible
What is a Centre or long-link chain line
It indicates the centre of an object
What is a Projection line
Used to show the projection between different lines
What is a Construction line
Used while constructing the main drawing
Look at pg 3 of Graphic communication for images of lines
Learn table
What is a dimension
A dimension is the length of a part of a line, shape or object. These can either be one-dimensional, two-dimensional or three-dimensional.
What is a 1-dimensional line
A one-dimensional shape is simply a line. A line has a length but no thickness. The length of the line is the one dimension. A line is drawn with some thickness to enable us to see it.
What are the 4 types of lines
Curved
Verticle (up and down)
Oblique (diagonal)
Horizontal (left to right)
What are 2-dimensional shapes
These are flat shapes or surfaces that in most cases need at least two dimensions to fully describe them. The true shape of 2D surfaces, because they are flat, can be drawn on flat sheets of paper.
What is an orthographic drawing
It is when each plane of a 3D object is drawn seperatley
The following will show you where each drawing must go
Front view Side View
Top view
What 5 things does the design process consist of
1) Identify (needs or wants)
2) Investigate (needs analysis and description)
3) Design (designing, developing and making)
4) Evaluate (testing, evaluation and presentation)
5) Communication (the idea or solution)
What is a structure
A structure is an arrangement of materials intended to support, bear, contain or withstand applied loads and forces. We are surrounded by structures, both natural and manufactured.
What are the reasons for structures
Structures provide protection and shelter.
the shell of a snail
Structures support loads.
The spider’s web
Structures provide containment.
What are the 3 types of structures
Shell structures
Frame structures
Mass / Solid structures
What is a shell structure
A shell is a hollow structure, which could bear substantial loads, contain, support and protect something.
What is a frame structure
Frames are useful in structures where strength and lightness are essential.
What is a mass or solid structure
A mass or solid structure is made up almost entirely of matter.
In making decisions about the type of structure, materials and dimensions, there are three critical factors to consider. What are they
1) Strength
The structure must not fracture or collapse when in use.
2) Rigidity
The structure must resist bending, buckling, twisting or distorting in shape when loaded.
3) Stability
The structure must not fall over.
Define force
Force is an effect that a body experiences as something that pulls or pushes it
What is referred to when someone asks about the strength of a structure
The strength of a structure is the strength of the material from which it is made. This is the resistance of the material to fracture when force is applied to it.
What is a Newton
A Newton is the unit by which force is measured. It is abbreviated as N. A force of strength 1 Newton is approximately equal to the weight (the force of gravity) on a 100-gram mass.