Goal: plan and, where safe, compare movement of same-shape/same-material objects of two verified sizes, with a cautious claim. Proposed codes: AC9SFU02, AC9SFI01, AC9SFI03. Prepare: adult-verified broad/light size pair or MODEL ONLY, comparison mat, Card 17.
- Match gate · 3 min. Verify shape/material and two sizes from source information; check that both are safe on the same flat lane. “Looks bigger” is a visible observation, material needs verification.
- Question · 4 min. Ask “In our two gentle releases, will the larger and smaller approved objects stop in the same place?” Let child predict without claiming a physical rule.
- Model · 5 min. Teacher shows blank SAME / DIFFERENT / OTHER CHANGED boxes. Explain that a larger object may also weigh more, and one trial does not isolate every influence.
- Child try · 7 min. Card 17 guides two actual adult-led releases if both safe, with start/surface/action fixed as far as possible. Record dated results exactly or NOT TESTED. If pair is unavailable, use an invented empty template to plan only.
- Check · 4 min. Child says which details matched, which did not, and whether the result matched each prediction. Do not infer “bigger always travels farther”.
- Exit · 2 min. Ask what would need to be repeated or held alike before a stronger size claim.