Skill: course-build → write-mcqs (PP100 type sheet) → write-explanation @ df153ae; v2 reviews applied @ b0fa825 (2 Oct 2026 — one item cut, PP-11 onward renumbered one lower; see BUILD_RECORD_G4T03.md, "v2 — reviews applied")
Grade 4 Topic 3 — How magnets push and pull — PP100 question types (the sheet James reads first)
Ten types, one exemplar each printed in full from content/G4T03_pp100_bank.py (the exemplar is the first item of its type in the bank; every bank item carries its type number in type_). The bank (v2): 51 items · 22 easy · 18 medium · 11 hard · per atom FOR4-010 11, FOR4-011 9, FOR4-012 12, FOR4-013 10, FOR4-014 9 · 45 four-option MCQs, 1 order item, 1 multi-select, 4 typed · MCQ keys A 11 · B 12 · C 11 · D 11. (v1 had 52; v1's PP-10, the names of the two poles, was L02 q4 and L03 q1 with the frame changed and was cut.)
Bar list (real things the bank never names, because they break the taught class claim): no cutlery as the magnet's steel thing (kitchen stainless is often not pulled); no coins other than "a copper coin / penny" (US nickels and dimes are not pulled, but a child cannot know their metal); no "silver" or "gold" things (not in the rule); no fridge magnets or magnetic toys with hidden poles; no compass (Grade 5).
| # | Type (stem shape · option kind) | Atom | Tiers used | Example stem |
|---|---|---|---|---|
| 1 | Which of these four things does a magnet pull? · four things, each named with its stuff | FOR4-010 | easy | "Which of these does a magnet pull?" |
| 2 | A magnet did / did not pull X — what is X made of? · four stuffs | FOR4-010 | easy, medium | "A magnet picks up a bottle cap. What is the bottle cap made of?" |
| 3 | A pole fact: how many poles, what an end is called, the name of the end marked N / S, where a bent magnet's poles are · four labels | FOR4-011 | easy, medium | "How many poles does every magnet have?" |
| 4 | Two named facing poles (or a turn) → what the magnets do · the fixed set They attract / They repel / They stay still / One attracts and the other repels | FOR4-012 | easy, medium | "A north pole faces a south pole. What do the two magnets do?" |
| 5 | Hidden-pole deduction: the result and one facing pole are given, name the other · a north pole / a south pole / either pole / no pole | FOR4-012 | medium, hard (chained along three magnets) | "Two magnets attract, and the facing pole on the first magnet is a north pole. Which pole on the second magnet faces it?" |
| 6 | Closer-stronger prediction: a magnet moves, or three distances are given · stronger / weaker / the same, or the distances | FOR4-013 | easy, medium, hard | "A magnet moves closer to a steel bolt. What happens to the magnet's pull on the bolt?" |
| 7 | Which sentence is true? · four statements, the misconceptions (MAG-01, 04, 05, 06, 07) as the distractors; never a verdict + reason in one option | FOR4-010, 011, 012, 013 | easy, medium, hard | "Which sentence is true?" (steel and iron / every metal / only shiny things / wood) |
| 8 | The model: what pulls the floating paperclip up / down, what the model shows, what it leaves out, a transfer through card, plastic, water · four labels or statements | FOR4-014 | easy, medium, hard | "A steel pin hangs in the air on a thread, under a magnet taped inside a box lid. What pulls the pin up?" |
| 9 | The build steps as an ORDER item · three or four steps tapped in order, each step needing the one before (v2: ruler and magnet first, then the thread taped UNDER the magnet) | FOR4-014 | medium | "Harvey builds a floating pin. Tap the steps in the order he does them." |
| 10 | Typed recall of a term from a plain description · the stem says "Type the science word" (v2); text entry, accept list with article, plural, -ing form and child spellings | FOR4-010 (steel / iron), 011 (pole), 012 (attract, repel) | hard | "A magnet has two different ends. Type the science word for one end of a magnet." |
north pole and south pole are recalled by MCQ (type 3), never typed (ten letters; RECALL_BY_MCQ).
The ten exemplars, in full
Type 1 (easy, FOR4-010). Which of these does a magnet pull? — a copper coin · an aluminum ladder · a steel bolt · a plastic spoon. Why: A magnet pulls steel and iron. / The bolt is steel, so the magnet pulls it. / Copper and aluminum are metals, but a magnet does not pull them. / A magnet does not pull plastic.
Type 2 (easy, FOR4-010). A magnet picks up a bottle cap. What is the bottle cap made of? — steel · copper · aluminum · brass. Why: A magnet pulls steel and iron. / The magnet picked the bottle cap up, so the cap is made of a metal a magnet pulls. / Copper, aluminum and brass are not pulled by a magnet. / So the bottle cap is steel.
Type 3 (easy, FOR4-011). How many poles does every magnet have? — one · two · three · four. Why: Each end of a magnet is called a pole. / Every magnet has two different ends. / So every magnet has two poles.
Type 4 (easy, FOR4-012). A north pole faces a south pole. What do the two magnets do? — They attract. · They repel. · They stay still. · One attracts and the other repels. Why: A north pole and a south pole are two different poles. / Two different poles attract. / So the two magnets pull together.
Type 5 (medium, FOR4-012). Two magnets attract, and the facing pole on the first magnet is a north pole. Which pole on the second magnet faces it? — a north pole · a south pole · either pole · no pole. Why: The magnets attract, so the facing poles are two different poles. / The first facing pole is a north pole. / So the second facing pole is a south pole.
Type 6 (easy, FOR4-013). A magnet moves closer to a steel bolt. What happens to the magnet's pull on the bolt? — It gets weaker. · It stays the same. · It stops. · It gets stronger. Why: The closer a magnet is to a thing, the stronger its pull on it. / The magnet moves closer to the bolt. / So its pull on the bolt gets stronger.
Type 7 (easy, FOR4-010; MAG-01 as a distractor). Which sentence is true? — A magnet pulls every metal. · A magnet pulls steel and iron. · A magnet pulls only shiny things. · A magnet pulls wood. Why: A magnet pulls steel and iron. / Copper, aluminum and brass are metals, and a magnet does not pull them, so a magnet does not pull every metal. / Shiny is not the rule: a shiny copper coin stays. / A magnet does not pull wood.
Type 8 (easy, FOR4-014). A steel pin hangs in the air on a thread, under a magnet taped inside a box lid. What pulls the pin up? — the thread · the air · the magnet · the box lid. Why: The pin is steel. / The magnet pulls the pin up through the lid and the air, without touching it. / The thread is tied below, so it pulls the pin down.
Type 9 (medium, FOR4-014, order). Harvey builds a floating pin. Tap the steps in the order he does them. — Rest a ruler across two stacks of books, with a magnet taped under the ruler. → Tape one end of a thread to the desk under the magnet, and tie the other end to a steel pin. → Lift the pin up toward the magnet, and let go. → If the pin sticks to the magnet, cut the thread a little shorter. Why: First the ruler with the magnet under it goes across the books. / Then the thread is taped to the desk right under the magnet, and tied to the pin. / Then the pin is lifted toward the magnet and let go. / Last, if the pin sticks to the magnet, the thread is too long, so it is cut shorter. (v2: the thread goes UNDER the magnet, so step 2 needs step 1; the blind read found v1's first two steps could swap.)
Type 10 (hard, FOR4-011, typed). A magnet has two different ends. Type the science word for one end of a magnet. — accept: pole · a pole · the pole · poles · pol · poal. Why: Each end of a magnet is called a pole. / One pole is the north pole, and the other pole is the south pole. Hard because: the term is produced from a plain description, with no options to recognise.
Hard items and their "hard because" lines (11)
| PP | Atom | Hard because |
|---|---|---|
| 41 bolt (typed steel / iron) | FOR4-010 | the metal is produced from what the magnet did, no options |
| 42 pole (typed) | FOR4-011 | typed recall of the coined term |
| 43 attract (typed) | FOR4-012 | typed recall of the coined term |
| 44 repel (typed) | FOR4-012 | typed recall of the coined term |
| 45 three magnets in a row | FOR4-012 | the attract rule is chained twice along the row |
| 46 Leia's far-away claim | FOR4-013 | judge a claim (MAG-07) and pick what really happens |
| 47 the stronger magnet at the same 6 centimeters | FOR4-013 | distance held fixed; the student reasons about which pull was stronger than Earth's pull on the pin (leans on Grade 3 FOR3-022) |
| 48 the pin at 8 centimeters | FOR4-013 | carry the weakening past the last stated distance |
| 49 what the model cannot show until the thread changes | FOR4-014 | name what the model leaves out, and why |
| 50 the pulls on the still paperclip | FOR4-014 | read the model with balanced forces (leans on Grade 3 FOR3-042) |
| 51 cut the thread shorter | FOR4-014 | change the model to test a new distance (v2: the stem states the geometry — thread taped to the desk, magnet fixed above) |
Design-move inventory (one line per bank item: move · scene kind · nearest lesson-side instance)
Lesson-side moves the bank was read against: L01 q2–q8 "does the magnet pull <named thing>?" (nail, copper wire, foil, iron gate, steel can, brass doorknob, plastic ruler); L01 q9 / q11 "what is it made of" (a coin that stays; a hairpin picked up); L01 q10 Harvey's any-metal claim; L02 q2–q7 pole facts on drawn magnets (N shown / S shown / horseshoe); L02 q9 Teddy's same-ends claim; L03 q2–q5 drawn pairs; L03 q6–q7 told pairs (Harvey N–N, Teddy S–N); L03 q8–q9 hidden pole with the result "repel"; L03 q10 Thea's always-pull claim; L04 q3–q5 the steel ball at A 2 / B 5 / C 10; L04 q6 two clips (book / desk); L04 q7 magnet slid away from a pin; L04 q8 Harvey at 20 centimeters; L04 q9 Leia's big-magnet claim (6 vs 2); L04 q10 Thea's far-away claim; L04 q11 why the clip stays; L05 q2 what pulls up (shelf); L05 q4 why it stops; L05 q5 what the model shows; L05 q6 order (three steps, paperclip); L05 q7 can it show the reach; L05 q8 glass of water; L05 q9 table top; L05 q10 Teddy's air claim; practice PR-1 … PR-16 (thumbtack; copper pot; turned magnet → attract; S end → north pole; pairs A / B drawn; 8 → 3 centimeters; Harvey's why; 5 vs 3 paperclips; pin on card; the still paperclip balanced; steel key vs brass key FRQ; the N / S term items; the three typed terms).
| PP | Move | Scene kind | Nearest lesson-side |
|---|---|---|---|
| 1–3 | pick the one thing of four a magnet pulls | a list of four household things (v2: PP-3 asks which one JUMPS, so no three-of-a-kind option set) | L01 q2–q8 (one thing, yes / no) — the move differs: four things, one key |
| 4–5 | infer the stuff from what the magnet did | a bottle cap picked up; a shiny bracelet picked up (v2: iron is the key, so the three wrong stuffs are the metals a magnet does not pull) | L01 q9 / q11 (coin, hairpin) — new objects, the "could be" form on the bracelet |
| 6–7 | pick the true sentence | general; a copper pipe | L01 q10 (Harvey's claim) — the claim is a distractor here, not a verdict |
| 8–11 | pole facts, no drawing | told magnets; Thea points to an end; N marked; which letter marks the north pole (v2) | L02 q2–q6 (drawn) — words, not drawings |
| 12 | true sentence about the two ends | general | L02 q8 |
| 13–14, 17 | facing poles told → what happens | N–S; S–S; Teddy's N toward Leia's N | L03 q6–q7 — fresh pairs; the fixed four-option set |
| 15 | repel → which poles could face | general | L03 q8–q9 (hidden pole on a drawing) — no drawing, "could be" form |
| 16 | pick the true sentence | general | L03 q11 |
| 18–20 | pull as the magnet moves / at which of four distances is it weakest | a bolt; a lid; a ball at 1 / 2 / 4 / 9 centimeters | L04 q5 / q7 (ball position 3 → 2; pin slid away) — new objects and a four-distance pick |
| 21–22 | what pulls the pin up; what the model shows | a magnet inside a box lid | L05 q2 (shelf) / q5 |
| 23 | infer a pair of stuffs from one yes and one no | a key and a coin in a drawer | L01 q9 / q11 — two things at once |
| 24 | the magnet pulls only the pin; Earth pulls both (MAG-06) | a pin and a rubber eraser | L01 article (earth_and_magnet) — the figure's contrast as an item |
| 25 | one of four buttons jumps → its stuff | four buttons | L01 q11 — a set, one picked out |
| 26 | poles with no letters | a painted magnet | L02 q7 (horseshoe) — a different "still two poles" case |
| 27 | what pull-then-push shows about the ends | a hanging magnet, told | L02 q9 — asks what it shows, not whether |
| 28 | where a horseshoe's poles are | a U-shaped magnet | L02 q7 (how many) — where, not how many |
| 29–30 | hidden pole from attract / repel, told | first magnet N / S | L03 q8–q9 — told, and one on "attract" |
| 31 | attract → turn one → repel | Leia turns a magnet | L02 q1 (push → turn → pull) — the reverse direction, in the coined words |
| 32 | push apart → which poles face (same / different) | two magnets on a desk | L03 q11 — class of poles, not a named pole |
| 33 | three pins at three distances: which is pulled hardest | 1 / 4 / 9 centimeters | L04 q3 (one ball, three positions) — three pins, one magnet |
| 34 | two equal magnets at two distances: which pin is pulled harder | magnets A and B | L04 q6 (two clips, one magnet) — two magnets |
| 35 | which magnet is stronger from the paperclip counts (MAG-04) | 7 vs 4 (v2: no "heavier" option) | L04 q9 (claim, 8 vs 3) — bare comparison, no claim-maker |
| 36 | pick the true sentence about distance (MAG-07) | general | L04 q10 |
| 37 | order the build steps | a floating PIN, four steps, ruler first (v2) | L05 q6 (paperclip, three steps) — a fourth step (the too-long thread) |
| 38 | what a jump through cardboard shows | cardboard between magnet and pin | L05 q9 (table top) / PR-9 (pin on cardboard follows) — the cardboard BETWEEN, a jump |
| 39 | which TWO things pull the paperclip down (multi) | the model | L05 q4 (why it stops: the thread) — a set, Earth included |
| 40 | what a magnet in a plastic bag shows | a bag round the magnet | L05 q8 (glass and water) — a new material |
| 41–44 | typed recall | — | PR-14–16 (typed pole / attract / repel) — the same terms, a different stem each (v2: the bank's attract / repel stems name two magnets, the quiz's name two poles); the bank is the certifying copy |
| 45 | chain the rule along three magnets | three in a row | L03 q8–q9 — two steps |
| 46 | what really happens against a far-away claim | Leia, 10 vs 1 centimeter | L04 q10 (verdict only) — the happening |
| 47 | same distance, stronger magnet → jumps | 6 centimeters twice | L04 q11 (why it stays) — strength varied, distance fixed |
| 48 | extrapolate past the last distance | pin at 1, 2, 3, 4 then 5 centimeters; asked at 8 (v2: the happening told step by step) | L04 q7 — beyond the stated point |
| 49 | what the model cannot show until the thread changes | 1 centimeter thread | L05 q7 (can it show the reach) — which thing, and the condition |
| 50 | the pulls on the still paperclip | the model | L05 q1 / PR-10 (balanced yes / no) — the true sentence among four |
| 51 | change the model to test 3 centimeters | Harvey's thread, taped to the desk under a fixed magnet (v2) | L05 q7 — the action to take |
Draw constraints (⟂, v2 numbers): PP-6 ⟂ PP-1–3 (the true sentence names the rule the sort items apply); PP-16 ⟂ PP-13–15; PP-36 ⟂ PP-18–20; PP-22 ⟂ PP-49 (what the model shows / what it leaves out); PP-39 ⟂ PP-50; PP-10 ⟂ PP-11 (each states the other's fact); recognition → recall (blind read, 2 Oct 2026): PP-42 (pole typed) ⟂ PP-8, PP-9, PP-26 (their stems or options print "pole"); PP-43 and PP-44 (attract / repel typed) ⟂ PP-13–17 and PP-29–32 (their options print attract and repel); PP-41 (steel / iron typed) ⟂ PP-4, PP-5, PP-23, PP-25 (their options print steel and iron).
⟂ added after the v2 re-read (2 Oct 2026): PP-37 ⟂ PP-51; PP-49 ⟂ PP-51.