Skill: write-like-james @ 43d3060 · the build: write-lesson, write-mcqs, write-video-script @ 43d3060

Topic 19 "Sinks, floats, sticks to a magnet: choosing materials" — your read (28 September 2026, night)

Four lessons in the Matter strand, after the comparisons: does it sink or float (a test you write down), does a magnet pull it (a test that sorts), mix two materials to do a job (a fair test with three bricks), and say why that material (name the property the job needs). Written by the author as you, then a non-author review (32 findings, 31 applied, 1 recorded), then a cold read of every changed item (29 of 29 keys agreed). Reply by number.

The two that unblock the bank

1. Do the ten question types stand, with the typed hard tier? Your night ruling is applied: the hard tier is typed — the material that suits a floating job, read off a table of four materials (text: wood); the property that suits a fresh job, a greenhouse wall so light gets to the plants (text: see-through); the floater's name from two drawn tanks (text: plastic lid). Easy and medium are four-option MCQs and are the bulk. Every atom is tested alone and in a pair (the two tests feed the choice: the magnet-test table for a notice board; the sink-or-float table for a sailboat). The reviewer caught four exemplars that were lesson checks renamed; every one was re-instanced and the sheet's table shows the nearest lesson-side use beside each. One word is yours: the greenhouse item accepts "clear" as well as "see-through". The ten types, coverage table, fresh-instance table Approve all / strike these / edit these · "clear" stays / goes

2. May L02 say "attracts" once, at its close? Topic 4 taught "a magnet pulls steel" and never said "attract"; the STAAR, Florida and Arizona papers say "attracted to a magnet". L02 keeps "pulls" in every frame, chip and option (the two groups are "the magnet pulls these" / "the magnet does not pull these") and ends, after the rule and the return: "When a magnet pulls an object, we also say the magnet attracts it." The word then sits in the glossary and nowhere else — the practice item that asked a child to type it was cut, because one sentence does not earn a recall item. Your rule "coin no word the everyday word already covers" argues against the line; the test papers argue for meeting the word once. Recommendation: keep the one line. L02's close Keep the one line / cut it

The lessons

3. L01 Does it sink or float? — a big wooden log and a small steel nail; Fidel says the log will sink and the nail will float; the test (lower it in, let go, watch where it ends up); the log floats, the nail sinks, so you cannot tell by looking; the table, one row per object; a stone, a cork, a candle stub mostly under the water ("It is not on the bottom, so it floats" — the boundary sentence the reviewer asked for). Nothing says why; "density" is nowhere. Quiz: eight drawn tanks on sinks / floats, a table read, the procedure, two claims. Article · script · quiz Fine / say where

4. L02 Does a magnet pull it? Sort them — two paperclips of the same shape, one steel, one plastic; the magnet takes one; "the stuff an object is made of is called its material"; a nail, a wooden block, the steel can and the aluminum can from Topic 4; the sort into two groups; the rule. Steel is never a piece of cutlery. Quiz: Topic 4 retrieved first, drawn tests on the two-group set, a drawn sort with one object misplaced, three claims, the term last. Article · quiz Fine / say where

5. L03 Mix two materials to do a job — Yoel's sand brick falls to bits; three bricks the same size (sand, clay, sand and clay), dried the same, the same push: bits, cracks, whole; "only what the bricks are made of is different, so this is a fair test" (Topic 7's word, retrieved first in the quiz); flour, water, dough. Quiz: table reads, three fair-test yes / no items, the one thing that changes. Article · quiz Fine / say where

6. L04 Say why that material — Effie slips in her socks and stops slipping in rubber soles; "a sole needs to grip; rubber is grippy; so rubber suits a sole"; a glass sole does not; a window (glass), a raincoat (plastic; paper soaks up water), a pillow (cotton); the two questions (what does the job need? which material has it?); "whether a thing floats, and whether a magnet pulls it, are properties too — a raft needs a material that floats; wood floats, like the log did." Quiz: which material suits, which property makes it suit, three claims, a bath toy that floats (cork), a fridge door a magnet must stick to (steel), the typed property last. Article · quiz Fine / say where

Applied without asking

Hard bank items typed with generated accept lists; every attached question stands alone on the video's own scene and never prints the key's word; no option bundles a verdict with a reason; every stem a positive question; hard means more of the skill; colour and no drawn people (Effie's kitchen is a cartoon for David; the log and nail, the two paperclips, a brick, a rubber sole and a window are photos); sinking and floating recorded, never explained; the surprising members first; the magnet pulls steel, not every metal (the aluminum can stays; Loa's claim keyed no); "stuff" beside the coinage of material; nothing "weighed" or "heavier"; the fair test named in L03; the tie-in line kept with the raft; every drawn floater honest per object (the orange and the candle stub mostly under, the leaf and the ping-pong ball on top); the walnut that "sank" became a carrot; the register notes for MAT3-007, 008, 060 and 061 wait in ATOM_PROPOSALS_G3T19.md for your word.

Also on the site

Intro and poll · summary and three questions · mixed practice · the blueprint's decisions

After you answer

1 → a bank of about fifty from the approved types, a second cold read, the hand-over folder for David. 2 → the line stays or goes (one edit). Register notes → the knowledge-graph repo.