Models, materials and iterative prototyping
| English | 中文 | Pinyin |
|---|---|---|
| prototype/ˈprəʊtəʊtaɪp/ | 原型 | yuán xíng |
| iteration/ˌɪtəˈreɪʃn/ | 迭代 | dié dài |
What would explain this observation?
- A cardboard prototype 原型 can reveal reach and arrangement without proving that the final material is strong enough. Different models answer different questions.
- Start with a prediction. State the quantities or features you would compare, then decide what evidence could distinguish two explanations.
Build the model
- A model represents selected features of a design. A prototype supports testing before or during development. Material selection depends on mechanical properties, manufacture, use conditions and end-of-life choices.
- prototype: A developing version used to test a solution; iteration 迭代: Revision guided by evidence and repeated testing.
What can a scale appearance model establish directly?
State what each model includes and omits. Compare tests with the same load, geometry and conditions. Iteration means using evidence to revise a solution and testing the revision against the original success criteria.
Match each technical term to its precise meaning.
Use the definitions to distinguish related quantities and processes.
Choose evidence that can test it
- State what each model includes and omits. Compare tests with the same load, geometry and conditions. Iteration means using evidence to revise a solution and testing the revision against the original success criteria.
- Make a low-risk model under school workshop rules. Record dimensions, material, process and test method. Use photographs, measurements and user feedback as evidence. Machines and load tests require teacher supervision and approved guards.
Which two habits make the investigation or model in this case more defensible?
Make a low-risk model under school workshop rules. Record dimensions, material, process and test method. Use photographs, measurements and user feedback as evidence. Machines and load tests require teacher supervision and approved guards.
Work from known quantities
- State the known values and their units. Choose the relation because its assumptions fit this case, then rearrange before substitution.
- Known: a beam prototype deflects 8 mm under a stated load; a revision deflects 5 mm under the same conditions. Reduction = (8-5)/8×100 = 37.5%. The result supports greater stiffness in that test, not proof of every strength or fatigue property.
Deflection falls from 10 mm to 6 mm under equal conditions. Find percentage reduction. Use the same sequence: known quantities → model → relation → substitution → unit and interpretation.
Deflection falls from 10 mm to 6 mm under equal conditions. Find percentage reduction.
The result is 40 %. Known: a beam prototype deflects 8 mm under a stated load; a revision deflects 5 mm under the same conditions. Reduction = (8-5)/8×100 = 37.5%. The result supports greater stiffness in that test, not proof of every strength or fatigue property.
Check the conclusion and its limits
- Stiffness is resistance to elastic deformation; strength concerns failure stress. A visually accurate model need not reproduce material behaviour.
- Return to the original observation. Explain what the result supports, which conditions it assumes, and one way to test a competing explanation.
An attractive model proves the final product mechanical safety. This claim is false: Stiffness is resistance to elastic deformation; strength concerns failure stress. A visually accurate model need not reproduce material behaviour.
Models, materials and iterative prototyping: State what each model includes and omits. Compare tests with the same load, geometry and conditions. Iteration means using evidence to revise a solution and testing the revision against the original success criteria.
An attractive model proves the final product mechanical safety.
Stiffness is resistance to elastic deformation; strength concerns failure stress. A visually accurate model need not reproduce material behaviour.
A developing version used to test a solution: write the technical term.
prototype means A developing version used to test a solution.