# PLTW Lesson 1.4 Key Terms

### 24 terms by Natemail

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### Accuracy

the quality of nearness to the truth or the true value

### Assembly Drawing

A drawing that shows the various parts of an item when assembled.

### Cube

a block in the (approximate) shape of a cube

### Design Statement

A part of design brief that challenges the designer, describes what a design solution should do without describing how to solve the problem, and identifies the degree to which the solution must be executed.

### Geometric Constraint

Constant, non-numerical relationships between the parts of a geometric figure. Examples include parallelism, perpendicularity, and concentricity.

### Model

the act of representing something (usually on a smaller scale)

### Origin

the point of intersection of coordinate axes

### Prototype

original work used as a model by others

### Scale Model

A model of an object in which the dimensions are in proportion to the actual dimensions of the object.

### Solid

a three-dimensional shape

### Space

the unlimited expanse in which everything is located

### Two-Dimensional

Having the dimensions of height and width, height and depth, or width and depth only.

### Annotate

provide interlinear explanations for words or phrases

### Computer-Aided Drafting

the use of computers, software, and associated hardware for the production of graphic drawings

### Design Brief

A written plan that identifies a problem to be solved, its criteria, and its constraints. The design brief is used to encourage thinking of all aspects of a problem before attempting a solution.

### Extrusion

squeezing out by applying pressure

### Mock-Up

Also referred to as an Appearance Model. A model or replica of a machine or structure for instructional or experimental purposes.

### Numeric Constraint

A number value, or algebraic equation that is used to control the size or location of a geometric figure.

### Plane

(mathematics) an unbounded two-dimensional shape

### Puzzle

a particularly baffling problem that is said to have a correct solution

### Shape

the spatial arrangement of something as distinct from its substance

### Solid Modeling

A type of 3D CAD modeling that represents the volume of an object, not just its lines and surfaces. This allows for analysis of the object's mass properties.

### Three-Demensional

a figure whose points do not all lie in a single plane EX: cube, pyramid, sphere...

### Working Drawing

The set of plans from which a structure will be built. Working drawings are the vehicle by which the designer graphically conveys the final design solution. Their size is dependent upon the scope and nature of the project.

Example:

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