Science safe sources… | Foundation Science · T1 W7–8 · Materials

Real investigation gate

This is a teacher-made practice-sign surface inquiry, not a test of a real school safety sign or a lesson on its meaning. The Science question is: what happened to this dry mark on this approved surface after one gentle dry wipe? Adult checks school approval before marking or wiping anything. Choose a broad clean intact reusable board/panel or large paper/card sample, a school-approved non-toxic marker that is dry before viewing, and one broad clean dry cloth. No solvent, spray, wet chemistry, dusty chalk, loose film, small part, sharp edge, actual exit/help/health sign, child photo or device account is used. Adult makes marks in advance, handles the cloth, makes one slow gentle pass on a stable desk, and follows school cleaning rules. No child must touch ink, cloth or surface. Stop if fumes, staining, allergy, sensory/access or material suitability is uncertain.

Record local date; exact surface identity/source and verified material or UNKNOWN; mark type and marker product/source without advertising or claiming a chemistry; dry state; start view; adult handler; cloth and action; room light/view access; actual post-wipe mark in words (unchanged / lighter / gone / smeared / cannot tell / other); prediction timing; adult prompt. A child who hears a neutral adult description uses ADULT REPORT, not direct sight. If no actual preflighted source/test exists, write REAL OBSERVATION NOT AVAILABLE and use only labelled paper models. A drawing of a faded mark is not evidence of actual erasability. Do not claim every surface of a named material will behave alike: coating, ink, drying time and adult pressure vary.

For Week 8, use three separate large marked areas on one approved surface when possible, all prepared the same way and wiped one at a time by the same adult with a fresh clean cloth area and one gentle pass. Date and record Trial 1/2/3 separately, including any condition change. A visible “pattern in our three observations” needs three actual comparable records and guidance; a drawn AB decorative sequence is a different meaning of pattern. If only one or two real trials can be done, write INSUFFICIENT COMPARABLE OBSERVATIONS for a three-trial pattern. Never manufacture a third result. Repeats do not guarantee identical results or a universal law.

Complete original paper sources · fiction only

Model T · claim poster (Days 31–34). A wide outlined rectangle with the words PRACTICE SIGN above one thick horizontal line. Beneath it the invented claim reads “This mark always stays after a wipe.” No actual surface, marker, observer, wipe, date or result is supplied. Exact nonvisual/tactile: read the label, line and claim in that order; use a broad fixed raised horizontal strip as the invented mark. The claim cannot be verified by the drawing.

Model U · three method cards (Days 32–33). U1: “Adult checks an approved practice surface, dry mark and broad cloth; adult wipes once gently at a stable table.” U2: “Child uses a spray cleaner on a real exit sign.” U3: “Draw a faded line on paper and call it an observed classroom result.” U1 is a possible method only after local approval; U2 is inappropriate; U3 is model-making, not an investigation. Read cards fully, no product demonstration implied.

Model V · invented three-record set (Days 36–39). Each card is stamped FICTIONAL PRACTICE; NO CLASSROOM TEST. V1 says “BEFORE: one horizontal thick line. AFTER: a thin horizontal line was drawn.” V2 says “BEFORE: one horizontal thick line. AFTER: a thin horizontal line was drawn.” V3 says “BEFORE: one horizontal thick line. AFTER: blank space was drawn.” The artist's marks differ in the invented record. No verified material, ink, cloth, pressure, date or real erasing is given. A child may group V1/V2 as same drawn after-mark and V3 as different, but cannot claim two actual wipes lightened and one removed a mark. Exact nonvisual/tactile: read V1, V2, V3 in that order; three broad fixed text strips are enough.

Model W · language cards (both weeks). Four complete invented statements: “I predict this mark may look lighter after one adult wipe”; “I saw this exact mark look lighter after a real safe try today”; “The adult reported a lighter mark”; “The paper diagram draws a lighter line.” Without a real dated try, the second and third remain hypothetical examples of wording, not supplied observations. Sort PREDICTION / DIRECT / ADULT REPORT / MODEL.

Six A4 aids · exact linear and tactile alternatives

The SVG/PDF pairs have selectable text and accessible SVG title/description. The exact wording and order below lets a teacher use plain text, read-aloud, large print, AAC or broad fixed tactile cards. A tactile paper mark is a model until tied to an actual approved surface trial; no small loose token is needed.

safe-mark: heading “Test a practice mark safely”; subtitle “Adult preflight first. Never alter a real safety sign.” Six top-to-bottom boxes: “1 SOURCE · approved broad practice surface”; “2 PREDICT · before any wipe”; “3 PREPARE · dry mark, dry cloth, stable desk”; “4 TRY · adult makes one gentle pass”; “5 RECORD · date, action, actual result or NOT TESTED”; “6 LIMIT · this surface, ink and conditions only”. Tactile: six large secured numbered cards in order.
source-claim: heading “What does this claim need?”; subtitle “A printed claim is not an observed result.” Six blank boxes: “EXACT CLAIM + SOURCE”; “LOCAL DATE + APPROVED SURFACE”; “VERIFIED MATERIAL OR UNKNOWN”; “QUESTION + PREDICTION BEFORE TRY”; “ACTUAL ACTION + ACCESS OR NOT TESTED”; “SUPPORTED WORDS + STILL UNKNOWN”. Tactile: six large labelled panels; adult transcribes exact child wording.
wipe-log: heading “Before · one wipe · after”; subtitle “Record a result only when a safe real trial happened.” Six blank boxes: “SOURCE + DATE + ACCESS”; “SURFACE / MARK / DRY STATE”; “PREDICTION BEFORE TRY”; “ADULT ACTION + CLOTH”; “ACTUAL AFTER MARK OR NOT TESTED”; “WHAT ELSE MAY HAVE CHANGED”. Tactile: six panels with a broad fixed before/after divider, no prefilled result.
model-sign: heading “A claim on paper is a question”; subtitle “INVENTED MODEL · not a real sign or wipe result.” Drawing: broad rectangular outline; top label PRACTICE SIGN; one thick horizontal line; below, “This mark always stays after a wipe.” Footer: “A drawing cannot verify an actual surface, action or result.” Exact read-aloud is Model T above; a broad raised horizontal strip remains invented.
repeat-record: heading “Three tries · what repeats?”; subtitle “Use three comparable actual records or label MODEL ONLY.” Six blank boxes: “SOURCE + DATE + SAME SETUP”; “TRIAL 1 · BEFORE / ACTION / AFTER”; “TRIAL 2 · BEFORE / ACTION / AFTER”; “TRIAL 3 · BEFORE / ACTION / AFTER”; “SAME / DIFFERENT / INSUFFICIENT DATA”; “CAUTIOUS PATTERN + NEXT CHECK”. Tactile: three broad numbered trial cards followed by two summary cards; read source first.
evidence-summary: heading “Tell what the evidence can say”; subtitle “Actual observation, adult report and model stay separate.” Five blank boxes: “SOURCE + DATE + DIRECT / ADULT REPORT / MODEL”; “QUESTION + PREDICTION”; “WHAT WE ACTUALLY DID / OR NOT TESTED”; “WHAT OUR RECORDS SHOW IN THESE TRIES”; “ONE LIMIT + A SAFE NEXT QUESTION”. Tactile: five large ordered prompts and adult scribe; private response allowed.