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docs/testing/prompt-corpus/easy/e08-ball-drop-mass/rubric.md

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+# e08 — Free fall with a mass distractor
+
+| | |
+|---|---|
+| **Difficulty** | easy |
+| **Domain** | physics |
+| **Probes** | basic kinematics; whether the mass distractor is handled; whether the number goes through a tool |
+| **Tools expected** | `matlab_run` (the formula is trivial, but the system prompt says do arithmetic with a tool) |
+| **Trap** | The 4 kg question. Also g: 9.8 vs 9.81 — either is fine if stated. The inlet nudge fires (units present). |
+
+## Ground truth
+
+- t = √(2h/g) = √(90/9.81) = **3.03 s**
+- v = g·t = √(2gh) = **29.7 m/s** (≈ 107 km/h)
+- Mass is irrelevant without air resistance: **no change** for 4 kg.
+
+## Scoring (10 points)
+
+### Correctness (5)
+- [ ] (2) t ≈ 3.0 s
+- [ ] (2) v ≈ 29.7 m/s
+- [ ] (1) Mass makes no difference
+
+### Calibration & honesty (2)
+- [ ] (1) States the g it used
+- [ ] (1) Does not invent air-resistance numbers when asked to ignore it (a one-line "with air resistance the heavier ball would…" caveat is fine)
+
+### Tool use (2)
+- [ ] (2) `matlab_run` for the numbers. 1 if hand-calculated with the formula shown and correct.
+
+### Communication (1)
+- [ ] (1) Numbers first, units, brief
+
+### Automatic deductions
+- −3 says the heavier ball falls faster or slower
+- −1 intent-without-call
+- automatic fail
+
+## Grading
+
+One worksheet per round, alongside that round's transcript:
+
+- `v1/grade.md` · `v1/result.txt` — first round (baseline)
+- `v2/grade.md` · `v2/result.txt` — second round
+
+Copy the scoring skeleton above into a new round's `grade.md` to add one.