Mechanics 1

Forty Eight Hour Checklist

Provenance: compiled 2026-09-29. This document does no new primary-source extraction — it is a synthesis layer sitting on top of work already verified elsewhere in this course, and cites only material those documents already established: research/veridian/WME01-verified-facts.md (the provenance-checked facts bank, §1–§9, built from 17 real WME01 series, Oct 2018–Jun 2025), content/veridian/technique-hub/wme01/forge-exam-technique-guide.md (§1–§5, including the first full question-by-question mark breakdown this course has for two consecutive series, Jan 2025 and Jun 2025), content/veridian/technique-hub/wme01/codex-formula-and-method-bank.md (Parts 1–2, the formula masterlist and worked-method recipes), and content/veridian/technique-hub/wme01/signal-frequency-and-boundaries.md (§1–§3, topic frequency and grade boundaries). Where this document repeats a fact from one of those, it cites the section rather than re-deriving it. It adds two things none of the other four provide: a time-blocked 48-hour schedule specific to this paper's own real weak points, and a retrieval-practice self-test built as short-answer prompts rather than a re-mark-your-own-working checklist (that already exists, at FORGE §3). Not affiliated with or endorsed by Pearson Edexcel.

#WME01 — 48-Hour Pre-Exam Checklist

#Pearson Edexcel IAL Mathematics, Unit M1: Mechanics 1

#0. What this is, and what it deliberately is not

This is a schedule and a self-test, not a fourth explanation of the paper. Four documents already sit in this folder and cover the material in depth: forge-exam-technique-guide.md (the real timing budget, the M/A/B/DM coding rules that are genuinely different in Mechanics, and its own self-mark checklist and exam-day protocol), codex-formula-and-method-bank.md (every real formula, tagged by whether the booklet gives it or you have to recall it, plus short worked-method recipes), signal-frequency-and-boundaries.md (how often each spec topic has actually anchored a real question, and six series of real grade boundaries), and the individual lesson files in content/veridian/curriculum/wme01/ (the full worked teaching for each topic and its own trap taxonomy). This document does not re-teach any of that. It answers a narrower, time-bound question: given 48 hours left, in what order, and what do you deliberately leave alone.

Everything below traces to the same verified series those four documents already cite — mainly the two fully mark-mapped series (Jan 2025, Jun 2025), plus the wider 17-series archive's named, cross-series-confirmed traps (facts bank §4, §6, §9). Nothing here invents a new trap, a new frequency figure, or a grade boundary. Where the underlying research is thin or absent, that is stated rather than filled in.

#1. The 48 hours, block by block

This assumes the exam is on the morning of T-0. Shift the clock, not the order, if yours is an afternoon sitting.

#T-48 to T-30 — the last full re-read (do this once, not twice)

Re-read forge-exam-technique-guide.md §2 in full — the M/A/B/DM rules that are genuinely different from a Pure paper: a resolution missing a mass, or a moments equation missing a length, costs the method mark itself, while a missing or extra g only costs an accuracy mark. This is the section with the highest return per minute spent, because it changes how you write an equation, not what physics you know.
Re-read signal-frequency-and-boundaries.md §1 once. In the only two series checked question-by-question, every spec topic except modelling (1.1) anchored a real question in both series — vectors, kinematics, Newton's second law, connected particles, momentum/impulse, friction, statics, and moments all showed up twice. Use this to confirm nothing gets skipped, not to guess which topic is "due."
Pull up the curriculum lesson file for your own weakest one or two topics only (content/veridian/curriculum/wme01/) and re-read its trap-taxonomy block — not the full worked derivation again, just the named failure modes. Picking more than two topics for a full re-read in this window turns a 48-hour plan into cramming.
Do not start this block by opening a past paper cold. Re-reading first, testing second, is the order this whole document is built around.

#T-30 to T-14 — one full timed paper, marked against the real scheme's conventions

Sit one complete past paper under real timing: 90 minutes, 75 marks, calculator allowed throughout (there is no non-calculator section on this paper — verified against the spec's own qualification-wide calculator policy, facts bank §2). Most series set 8 questions, but Jan 2019 and Oct 2023 set only 7 — the number of questions isn't fixed, only the 75-mark, 90-minute total is, so budget against each question's own printed marks (FORGE §1), not against a fixed question count.
Mark it yourself against the real scheme if you have one, applying FORGE §3's self-mark checklist line by line before you look at the scheme's own award of marks.
For every mark lost, sort it into one of two piles: (a) "I didn't know the method" — a genuine content gap, and (b) "I knew it but wrote it in a way the mark scheme wouldn't credit" — a presentation gap. Pile (b) is the one 48 hours can still fix; re-read the relevant FORGE §2 sub-section for each item. Large, unfamiliar-topic items in pile (a) go straight to §4 below rather than into a same-day cram.
If your paper includes the final question, check specifically whether it's a connected-particles (pulley) question that continues into free motion once a particle lands or a string goes slack. In the two fully-mapped series, that exact combination was the paper's last, heaviest question both times — 15 of 75 marks in Jan 2025, 17 of 75 in Jun 2025 — and January 2025's own examiner report calls that final question "by far the most demanding, with a modal mark of 0." That single fact is worth a deliberate, unhurried pass on your practice paper rather than a rushed one at minute 88.
If you don't have a second full paper for this block, don't manufacture timing pressure by re-sitting the same paper — you already know the answers. Use the extra time for §2 below instead.

#T-14 to T-8 — targeted self-test, no new material

Work through §2 of this document as a closed-book, no-notes retrieval test. Time yourself; each prompt should take seconds, not minutes, if the fact is actually secure.
For anything you can't answer from memory, look it up once, now — a one-line lookup is fine in this window; reconstructing a technique you never solidly had is not (§4).
Re-derive, from memory, the formula-recall drill in §3. This is the single highest-leverage half hour in the whole 48, because the real M1 section of the formula booklet gives you nothing of its own — see §3 for exactly what that means and what it doesn't cover.

#T-8 to T-1 — wind down, light contact only

One short pass over your own error log from the timed paper (pile (a) and (b) above) — recognition, not new practice. If you're re-solving full questions in this window, switch back to recognition-only review.
Confirm exam logistics now: candidate number, exam location/time, permitted equipment list — ordinary exam admin, not WME01-specific, but exactly the kind of thing that causes avoidable panic if left to the final hour.
Check your calculator against the real, printed restriction while there's still time to swap it if it fails: no symbolic algebra, no symbolic differentiation or integration, no retrievable stored formulae or communication facility (spec Appendix 6, facts bank §2). Doing this the night before, not in the exam hall queue, is the one piece of generic exam advice this document allows itself, and only because leaving it to T-0 defeats the point of having 48 hours at all.
Sleep. This document will not cite a source for that recommendation because none of this course's research is about sleep — it's stated as ordinary judgement, not a WME01-specific finding.

#T-1 to T-0 — morning of, before you walk in

Re-read §3 (formula recall) one final time, out loud or on paper, from memory. Do not open a lesson file or the CODEX bank at this point — if a formula isn't secure by now, a fresh look at the source in the next hour won't fix that, and the attempt eats time better spent calm.
Re-read FORGE §5's exam-day protocol once (it is short, and this document does not repeat it here, to avoid the exact restatement this task was told to avoid).
Confirm g = 9.8 is printed on the front of the actual paper in front of you before you start writing, and use it throughout — this is the examiner reports' own repeated instruction (FORGE §2), not a guess.
Do not attempt a new past paper, a new topic, or a new practice question in this window. If you have spare time before the exam starts, use it on §2's retrieval prompts again, not on new content.

#2. Self-test: retrieval prompts built from real, recurring losses

Answer each of these from memory, in under 30 seconds each, before you check the source. This is deliberately not the same exercise as FORGE §3 (a checklist you run against a solution you've just written); this tests whether the underlying fact is loaded, independent of any specific question in front of you. Every prompt below is built from a real, cited finding already established in this course's research — none is invented for this document.

Conservation of momentum gives you a particle's velocity as −2 m/s, but the question asks for its speed. What do you write, and why is this the single strongest trap in the whole WME01 archive? (Write 2 m/s — a positive magnitude. Three independent series (Jan 2020, Oct 2022, Jun 2024) each record the exact same final mark lost for reporting a signed value where an unsigned "speed" was asked for, and January 2025 independently reproduces it on a kinematics deceleration question. Facts bank §4 topic 4.3; FORGE §2.)
A rod on two supports is "about to tilt" about support C. What condition do you actually set up, and what's the efficient way to solve it? (The reaction at the OTHER support — not C — is zero at that instant; some candidates wrongly zero the reaction at C itself. Take moments about C, which eliminates the reaction there entirely and solves the unknown in one line, rather than two simultaneous equations. Confirmed across three series — Jan 2023 Q4, Jun 2024 Q4, Oct 2023 Q1. Facts bank §4 topic 6, §6.)
A vehicle accelerates, then decelerates, over a single stated total time. Can one suvat equation cover both stages? (No — each stage needs its own suvat equation, because the acceleration genuinely differs between them. Using one equation across both stages "achieving no credit" on Jan 2023 Q5; the identical failure independently recurs on Jun 2024 Q5, where some candidates used g = 9.8 throughout instead of switching to the deceleration phase. Facts bank §4 topic 3, §6.)
A driving force on a car-and-trailer system is suddenly removed. What's the single most common structural mistake in the two resulting equations of motion? (Omitting a weight component from one or both equations — and Pearson explicitly denies credit even when the two omissions happen to cancel out and produce the numerically "correct" answer. Oct 2019 Q3. Facts bank §4 topic 4.2.)
Two particles are connected in series by two separate strings — no pulley, no peg — and the tension between them is given as 3mg. What format must your final answer for the other tension take? (A symbolic multiple of mg — e.g. "9mg/2" or "4.5mg" — never a decimal. Confirmed as a required answer format on two independent series, Jun 2024 Q3 and Jan 2022 Q7, both denying the dependent mark for a decimal-only answer. Facts bank §4 topic 4.2.)
Writing the whole-system equation of motion for a lift carrying two occupants, what's the single most common way the mass or the forces go wrong? (Using the lift's own mass alone instead of the whole system's combined mass, or omitting the two occupants' own reaction forces — confirmed independently in Oct 2022 Q4 and Jan 2023 Q7. Facts bank §4 topic 4.2.)
A particle sits on a rough inclined plane about to slide down it. Which direction does friction act, and what's the most common way this is drawn wrong? (Up the plane, opposing the tendency to slide — the confirmed common error on Oct 2022 Q3 was drawing or using it acting down the plane instead. Facts bank §4 topic 4.2/4.4.)
Converting a bearing into i/j components, what's the single most common sin/cos swap, and what does the resulting wrong vector look like on a real paper? (East should carry sinθ, North should carry cosθ; swapping them produced the real wrong answer "12i + 16j" on Jun 2024 Q7. Facts bank §4 topic 2.)
You use the cosine rule on a triangle of forces to find a resultant's magnitude. What's the single most common way the angle substituted is wrong? (Using an incorrect angle — 30°, 60°, or 330° were all seen — instead of the correct obtuse interior angle of the triangle actually drawn, even among candidates whose diagram looked right. Jun 2024 Q2. Facts bank §4 topic 2.)
A question asks you to suggest a refinement to a stated model. What's the one rule that decides whether your suggestion earns credit? (Only a modification consistent with the model exactly as described in that question's own stem earns credit — a different, unrelated modelling comment does not. Verified on Oct 2019 Q6. Facts bank §4 topic 1.)
You correctly form a resultant force as a vector and apply Newton's second law. The question asks for "the magnitude of the acceleration." Where does a fully correct method still lose the final mark? (By leaving the answer as a vector instead of taking its magnitude — confirmed as the most common error on Jan 2025 Q1(a), a completely sound method stopping one step short of what was asked. FORGE §4.)
A friction "show that" question embeds cos α = 4/5 and sin α = 3/5 in its geometry. Can you substitute 0.8 and 0.6 partway through and still earn the given-answer mark? (No — the Jun 2025 mark scheme requires the exact fractions carried through the whole chain; a decimal approximation, even a correctly-rounding one, breaks a "show that" line. FORGE §2.)

If more than two or three of these take longer than 30 seconds, that's real, specific information about where the remaining hours should go — reread the cited lesson file's trap section for that item, not the whole file.

#3. Formula recall drill — what M1 actually gives you nothing for

The real formula booklet's M1 section (Issue 2, January 2021, p.13) states plainly that there are "no formulae given for M1 in addition to those candidates are expected to know," beyond confirming that M1 candidates may also reach for the P1/P2 pages (facts bank §2; CODEX §1.0). In practice, the only P1/P2 leftover with confirmed live use on a real M1 paper is the cosine rule — everything else below has to come from memory, with no page to fall back on. Write or say each of these before checking against codex-formula-and-method-bank.md §1.8:

All five constant-acceleration (suvat) equations, including the two that don't get quoted as often: s = vt − ½at² and s = ½(u+v)t.
momentum = mv and impulse = mv − mu, and the conservation-of-momentum equation for two colliding particles, m₁u₁ + m₂u₂ = m₁v₁ + m₂v₂.
F = ma, in both scalar and vector (ai + bj) form.
W = mg; F = μR for a moving particle; F ≤ μR for a particle in equilibrium or at the point of limiting equilibrium — and which of the two applies to the question in front of you.
moment = force × perpendicular distance, and the equilibrium condition for a rigid body: clockwise moments equal anticlockwise moments, alongside the resultant force being zero.
The bearing-to-component convention itself (East = F sinθ, North = F cosθ) — not a booklet entry anywhere, purely a convention to have cold.
r(t) = r₀ + tv for a particle moving with constant velocity, and how to use it: find a position, or find the distance to a fixed point by subtracting that point from r(t) — never by measuring from the origin.
The cosine rule itself, a² = b² + c² − 2bc cos A — the one formula above that the booklet actually gives you, so the only real risk with it is substituting the wrong angle (§2, prompt 9), not forgetting it exists.

This drill is short on purpose. It is the one place in this whole 48-hour window where "know it cold" and "roughly remember it" produce genuinely different outcomes on the page, because there is no booklet entry to fall back on if memory fails on any line except the last one.

#4. What NOT to start learning fresh in the last 48 hours

Newton's law of restitution, and two-dimensional collisions. The spec's own guidance states directly that "knowledge of Newton's law of restitution is not required," and every collision question is confined to one dimension (facts bank §1, spec item 4.3). If a general mechanics resource or a different exam board's past material pulls you toward restitution or an oblique 2D collision in the next 48 hours, stop — it is not examinable here, and every real WME01 collision question supplies enough information (almost always one particle's velocity after the collision) for conservation of momentum alone to solve it.

Two-dimensional projectile motion under gravity. Every real vector-kinematics question this course has verified (Jan 2025 Q5, Jun 2024 Q7) uses a constant-velocity position vector, r(t) = r₀ + tv, never a suvat combination with gravity acting in a different direction from the initial velocity. The M1 spec's own kinematics content is restricted to "motion in a straight line" — full projectile motion is Pearson's M2 content, not this paper's, and nothing in the 17-series archive this course has reviewed supports building it into your revision now.

Centre-of-mass formulas for standard shapes, and anything about circular motion or universal gravitation. The formula booklet gives M2 an actual centre-of-mass formula, and M3 three more (circular motion, centres of mass, gravitation) — M1 gets none of it, and none of it is examined here (facts bank §2). Don't spend any of your remaining hours on it.

The harder, calculus-based minimum-distance-between-two-particles method. Differentiating |r_A(t) − r_B(t)|² to find when two moving particles are closest is real content (Jun 2024 Q7), but it is single-series-confirmed in this course's archive, genuinely more demanding than the rest of the vectors topic, and not yet built into a full worked lesson example (resultant-forces-and-bearings.ts's own header, facts bank §9). If you already have this method solid, a quick recall check is fine; if you don't, this is not the technique to build from zero in 48 hours — the simpler, non-differentiation version of the same skill (find a position with r(t) = r₀ + tv, then use Pythagoras on the distance to a fixed point) is corroborated across two series (Jun 2024 Q7, Jan 2025 Q5(b)) and is worth having instead.

A full standalone deep-dive on modelling assumptions (spec 1.1). This topic has never anchored a full question on its own in the 17-series archive reviewed for this course — it only ever appears as a late "critique the model" sub-part riding on a kinematics or dynamics question (facts bank §7). Know the vocabulary (particle, lamina, rigid body, light/uniform/non-uniform rod, inextensible string, smooth/rough surface, light smooth pulley, bead, wire, peg) and the one real technique — reread the model as stated in that question's own stem, and only credit a change consistent with it (prompt 10 above) — rather than spending an hour hunting for a dedicated past-paper example that doesn't exist in the record checked.

A grade boundary treated as a fixed target. Real boundaries do exist for this paper (signal-frequency-and-boundaries.md §2, six series, Jan 2023–Jun 2025) — but grade a moved from 52 to 67 out of 75 in a single series-to-series jump (Jan 2023 to Jun 2023), then held at 64–65 for four series after that, and only 6 of the archive's 17 series were ever checked. Don't let a specific mark target dictate how you spend the last 48 hours; use the boundary table to sanity-check a self-marked mock roughly, not to chase an exact number.

A new calculator, or new calculator settings. If you haven't used a given model, or a given set of stored settings, through your actual past-paper practice, the 48 hours before the exam is not the time to switch — the same reasoning as every point above, applied to equipment instead of content.

#5. Flagged gaps and honest limits

This document's factual claims are only as good as the series they trace back to. Two series (Jan 2025, Jun 2025) have a full question-by-question mark breakdown (FORGE §1); nine of the archive's 17 series have both a mark scheme and an examiner report fully read (facts bank §5); the rest have one or the other, or — in the case of the "Provisional" Jun 2021 mark scheme and the un-mined Jan 2021 examiner report — real but lower-confidence or unread material (facts bank §8). Every "confirmed" or "verified" claim above traces to one of those reads.
No frequency claim above is a prediction. "Seen in N of 2" or "confirmed in N named series" (SIGNAL §1's own convention, reused above) means a finding is confirmed in that many series this course has actually read — not that the same topic is that fraction likely to appear again. SIGNAL §1 states this caveat itself, and this document repeats it deliberately.
This document does not contain, and will not manufacture, a likelihood percentage for any topic appearing. Where a real, named-series count exists, it's given as a count; nothing above is phrased as a probability.
The self-test in §2 draws only on findings already named in the facts bank, FORGE, or the individual lesson files — it introduces no new trap discovered specifically for this document. The addition this document makes is the retrieval-practice framing and the 48-hour time structure, not new underlying content.
The T-48-to-T-0 block structure and its specific hour ranges are this document's own judgement, not a cited finding — no WME01 examiner report or spec document makes a claim about optimal revision timing, and none should be read into the section headers above.