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pltw final 👹🏸🐡
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Gravity
Terms in this set (41)
big four fields in pltw
Chemical, civil, mechanical,electrical
Primary research
Generating original information
Secondary research
Gathering information that has already been generated
Types of pictorials (4)
Isometric, oblique cabinet, oblique caviler, perspective
Oblique cabinet
Starts with a front face view, doesn't show actual depth
Oblique caviler
Starts with a front face view, does show actual depth
Isometric
Show the same amount of front top and side 120 degree angle used
How to pick the best side
Natural position, shows best shape,longest dimensions,few hidden lines
One point perspective
Moves to one vanishing point on the horizon line
Two point perspective
Moves toward two vanishing points on the horizon line
Three point perspective
Moves toward three vanishing points on the horizon line
Sides shown in multiview drawings
Top, right, front
Plane of projection
An imaginary surface that exists between the viewer and the object, onto which a two dimension view of the object is created
Construction line
Very lightly drawn lines to guide drawing other lines and shapes
Object line
Thick, dark, define the object
Hidden line
Shows interior details not visible from the outside
Center line
Defines the center of arcs, circles or symmetrical parts. Half as thick as an object line
Section line
Define where material is cut away
Short break line
Shows where part is broken to reveal detail behind the part or to shorten a continually long part
Dimension line
Shows distance, arrows on the ends,actual distance in normally in the middle of this line
Extension line
Shows where a dimension starts and ends. Used with dimension lines
Long break line
Shortens very long objects, typically represented as a jagged cut or break
Leader line
Shows dimensions of arcs, circles, and detail
Precedence of lines
Object lines over hidden and center lines. Hidden lines over center lines. Cutting plane lines over all others
Significant digits
Significance digits are digits in a decimal number that hold significance about the certainty of the value
Precision
The degree to which repeated measurements show the same results
Accuracy
The degree of closeness of measurements of the quantity to the actual vakue
Four measurements of a dial caliper
Outside diameter or object thickness,inside diameter or space width, step distance, hole depth
Central tendency
Center of a distribution : mean, median, mode
Spread of values around the center
Range, standard deviation
Standard deviation
Calculate mean, sub rate the mean from each value and square the difference, sum all the squared differences, divide the sum by the number of values, take the square root of the result
Population standard deviation
When you have every data point from every member of a population
Sample standard deviation
When you only have a sample of the data points from a population
Calculating error
Mean of measured values-accepted value
Mock up modeling
An appearance model used to present the general concept of a design
Scale model
A representation of a design that is either larger or smaller than the actual int
Prototype
A working model of the actual design
Solid model
Shows volume, not just lines and surfaces
Wireframe model
Only shows lines and syrfaces
Additive the modeling
Adding together individual parts to get the finished piece
Subtractive modeling
Taking away pieces from a large piece to get the desired shape
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