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Mechanism Lab9-12 · Mechanism Lab: Prototype design review

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Structured investigationEngineering Design

Mechanism Lab: Prototype design review

Mechanism Lab focus: mechanical advantage, motion, and tradeoffs. A prototype meets its headline criterion, but its constraint margin is unknown.

Which Grade 9 prototype evidence shows that a design for mechanical advantage, motion, and tradeoffs meets its criterion without violating a constraint?

CourseEngineering Design

RigorOn-level

Performance artifactEngineering design review

Evidence minimum2 evidence forms

Connect a measured prototype result to one criterion and every stated constraint.

criterion
constraint
prototype
measurement

1Define
2Predict
3Prototype
4Test failure
5Iterate
6Defend tradeoff
7Transfer

Model

Criteria, constraints, and prototype

Run 3 prototype tests. Record load or demand, resource constraint, performance margin, and the first failure mode.

Criteria: meets the intended function; retains a measurable performance margin
Constraints: limited resources and time; safe and inclusive operating boundary
Failure measure: Performance margin
Tradeoff: Defend why the revision improves the priority criterion without concealing a cost, risk, or reduced margin.

Design load47%Resource constraint25%

Select the design claim that states a measurable criterion, constraint, and failure condition.

Evidence

Performance and failure margin

Commit a falsifiable model and run the repeated trials to generate the dataset.

Engineering design review

criteria and constraints
measured prototype result
failure analysis
defended iteration

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