# WME02/01 January 2018

> WME02/01 January 2018: 7 questions, 75 marks. Difficulty 0.45, deviation 0.13, algebraic 0.44, text density 0.50. Edexcel IAL Mathematics M2.

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Edexcel IAL · Mathematics · 2018 January

This Mechanics 2 (WME02) paper contains 7 questions worth 75 marks. The profile below reports five mark-weighted difficulty and complexity measures, and every question row repeats them. Full question text and mark scheme open in the Interactive Practice Hub.

- Edexcel IAL
- M2
- 7 questions
- 75 marks
- Free paper
- [Practise this paper](https://www.examsci.com/practice?set_id=dc5b3f44-2381-4939-823c-9410c0ab3e6b)
- [All M2 papers](https://www.examsci.com/past-papers/edexcel-ial/mathematics/mechanics-2-wme02/)

Core finding

**WME02/01 January 2018 is a past paper for Edexcel IAL Mechanics 2 (WME02), with 7 questions worth 75 marks.** Its mark-weighted Difficulty Measure is 0.45 on a 0.20–0.75 scale, with a Difficulty Deviation of 0.13 and a mark split of 12.0% Easy, 74.7% Medium and 13.3% Hard. Algebraic complexity averages 0.44; text density and modelling average 0.50. All five measures use 15 part-level tags, not candidate results. Every question row below repeats them and opens the Interactive Practice Hub for that question.

## Difficulty & complexity profile

All five measures are mark-weighted and calculated from 15 parts carrying 75 part marks. Difficulty tags cover 15 parts, algebraic tags 15 and text-density tags 15. Tags are internal metadata, not official exam-board ratings.

- **Difficulty Measure**: 0.45 — 0.20–0.75 · nearer Medium
- **Difficulty Deviation**: 0.13 — 0 = uniform; higher = more mixed
- **Difficulty Ratio**: 12.0 / 74.7 / 13.3 — % Easy / Medium / Hard
- **Algebraic Complexity Measure**: 0.44 — 0.20–0.75 · nearer Medium
- **Text Density and Modelling Measure**: 0.50 — 0.20–0.75 · nearer Medium

Scale: Easy 0.20 · Medium 0.45 · Hard 0.75, and Low 0.20 · Medium 0.45 · High 0.75 for the two complexity measures. [How each band is defined and how the values are calculated →](https://www.examsci.com/guides/difficulty-and-complexity-measures/)

### Definitions and calculation

| Measure | Paper value | Formula |
| --- | --- | --- |
| **Difficulty Measure** | 0.45 | Σ(d_i × w_i) / Σw_i, with d = 0.20 / 0.45 / 0.75 |
| **Difficulty Deviation** | 0.13 | √(Σw_i(d_i − μ)^2 / Σw_i) |
| **Difficulty Ratio** | 12.0% Easy / 74.7% Medium / 13.3% Hard | marks in band / all tagged marks |
| **Algebraic Complexity Measure** | 0.44 | Σ(c_i × marks_i) / Σmarks_i, with c = 0.20 / 0.45 / 0.75 |
| **Text Density and Modelling Measure** | 0.50 | Σ(t_i × marks_i) / Σmarks_i, with t = 0.20 / 0.45 / 0.75 |

w_i equals the part marks, except for a Hard part worth 4 or more marks, where w_i = marks^0.75 to offset the accessible starter steps inside long structured questions.

## Question list

Each measure is recalculated from the parts of that question and uses the same weights as the paper profile.

| Question | Topic | Marks | Difficulty Measure | Algebraic Complexity Measure | Text Density and Modelling Measure | Practice |
| --- | --- | --- | --- | --- | --- | --- |
| **Q1** FRQ | [4. Collisions](https://www.examsci.com/topics/edexcel-ial/mathematics/mechanics-2-wme02/collisions/) | 6 | 0.45 Medium | 0.45 Medium | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=dc5b3f44-2381-4939-823c-9410c0ab3e6b&question_id=c8608128-47e4-4695-aa37-7a0821b0b96c&source_detail=WME02%2F01+January+2018) |
| **Q2** FRQ | [1. Kinematics of a particle moving in a straight line or plane](https://www.examsci.com/topics/edexcel-ial/mathematics/mechanics-2-wme02/kinematics-of-a-particle-moving-in-a-straight-line-or-plane/) | 9 | 0.37 Medium | 0.37 Medium | 0.37 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=dc5b3f44-2381-4939-823c-9410c0ab3e6b&question_id=20008db6-9ea4-4d39-9fe2-57c931b9b1a2&source_detail=WME02%2F01+January+2018) |
| **Q3** FRQ | [2. Centres of mass](https://www.examsci.com/topics/edexcel-ial/mathematics/mechanics-2-wme02/centres-of-mass/) | 10 | 0.55 Medium | 0.45 Medium | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=dc5b3f44-2381-4939-823c-9410c0ab3e6b&question_id=594a2ce2-3c57-4325-a5c5-5fac648db479&source_detail=WME02%2F01+January+2018) |
| **Q4** FRQ | [4. Collisions](https://www.examsci.com/topics/edexcel-ial/mathematics/mechanics-2-wme02/collisions/) | 13 | 0.41 Medium | 0.41 Medium | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=dc5b3f44-2381-4939-823c-9410c0ab3e6b&question_id=9a5f5711-181c-40cd-86b1-a0ad0d7b285a&source_detail=WME02%2F01+January+2018) |
| **Q5** FRQ | [5. Statics of rigid bodies](https://www.examsci.com/topics/edexcel-ial/mathematics/mechanics-2-wme02/statics-of-rigid-bodies/) | 10 | 0.45 Medium | 0.45 Medium | 0.75 High | [Go to Practice Hub](https://www.examsci.com/practice?set_id=dc5b3f44-2381-4939-823c-9410c0ab3e6b&question_id=e906e1ea-b8c1-4eef-a741-54c335b5dd27&source_detail=WME02%2F01+January+2018) |
| **Q6** FRQ | [1. Kinematics of a particle moving in a straight line or plane](https://www.examsci.com/topics/edexcel-ial/mathematics/mechanics-2-wme02/kinematics-of-a-particle-moving-in-a-straight-line-or-plane/) | 10 | 0.45 Medium | 0.45 Medium | 0.75 High | [Go to Practice Hub](https://www.examsci.com/practice?set_id=dc5b3f44-2381-4939-823c-9410c0ab3e6b&question_id=45b014c9-9ee8-4997-b6c5-0c38dde904e4&source_detail=WME02%2F01+January+2018) |
| **Q7** FRQ | [1. Kinematics of a particle moving in a straight line or plane](https://www.examsci.com/topics/edexcel-ial/mathematics/mechanics-2-wme02/kinematics-of-a-particle-moving-in-a-straight-line-or-plane/) | 17 | 0.46 Medium | 0.50 Medium | 0.35 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=dc5b3f44-2381-4939-823c-9410c0ab3e6b&question_id=3e2a6794-f938-4ef1-8f74-71a1f22ac7b4&source_detail=WME02%2F01+January+2018) |

## Topics in this paper

- [4. Collisions](https://www.examsci.com/topics/edexcel-ial/mathematics/mechanics-2-wme02/collisions/)
- [3. Work and energy](https://www.examsci.com/topics/edexcel-ial/mathematics/mechanics-2-wme02/work-and-energy/)
- [1. Kinematics of a particle moving in a straight line or plane](https://www.examsci.com/topics/edexcel-ial/mathematics/mechanics-2-wme02/kinematics-of-a-particle-moving-in-a-straight-line-or-plane/)
- [2. Centres of mass](https://www.examsci.com/topics/edexcel-ial/mathematics/mechanics-2-wme02/centres-of-mass/)
- [5. Statics of rigid bodies](https://www.examsci.com/topics/edexcel-ial/mathematics/mechanics-2-wme02/statics-of-rigid-bodies/)

## Related papers

- [WME02/01](https://www.examsci.com/past-papers/edexcel-ial/mathematics/mechanics-2-wme02/2018-october-wme02-01/) — October 2018 — 7 questions · 75 marks — Free
- [WME02/01](https://www.examsci.com/past-papers/edexcel-ial/mathematics/mechanics-2-wme02/2018-june-wme02-01/) — June 2018 — 7 questions · 75 marks — Free
- [WME02/01](https://www.examsci.com/past-papers/edexcel-ial/mathematics/mechanics-2-wme02/2019-october-wme02-01/) — October 2019 — 8 questions · 75 marks — Free
- [WME02/01](https://www.examsci.com/past-papers/edexcel-ial/mathematics/mechanics-2-wme02/2019-june-wme02-01/) — June 2019 — 8 questions · 75 marks — Free
- [WME02/01](https://www.examsci.com/past-papers/edexcel-ial/mathematics/mechanics-2-wme02/2019-january-wme02-01/) — January 2019 — 8 questions · 75 marks — Free
- [WME02/01](https://www.examsci.com/past-papers/edexcel-ial/mathematics/mechanics-2-wme02/2017-october-wme02-01/) — October 2017 — 8 questions · 75 marks — Free

## Paper FAQ

**How are the difficulty and complexity measures calculated?**

Each part is weighted by its official marks. Difficulty uses Easy 0.20, Medium 0.45 and Hard 0.75; algebraic complexity and text density and modelling use Low 0.20, Medium 0.45 and High 0.75. A Hard part worth 4 or more marks is down-weighted to marks^0.75, so the accessible starter steps inside a long structured question do not inflate the difficulty result. This paper's Difficulty Measure is 0.45 from 15 parts.

**What does the Difficulty Deviation show?**

It is the mark-weighted standard deviation of the part difficulty values around the paper mean. A value of 0 would mean every tagged part has the same difficulty; this paper's deviation is 0.13, so its parts are more mixed than a single-level paper.

**Is the Difficulty Ratio based on question counts or marks?**

It is based on official marks, not question counts. This paper's shares are 12.0% Easy, 74.7% Medium and 13.3% Hard; the three shares sum to 100% before rounding.

**Are these official difficulty ratings?**

No. They are derived from the platform's part-level difficulty and static-question-profile tags. They are not exam-board grade boundaries and are not calculated from candidate outcomes. Use them to compare the demand profile of papers, not to predict a grade.

**Why does each question row show its own measures?**

Each row recalculates the same mark-weighted formula from that question's parts. A single-part MCQ therefore shows the tag value directly, while a multi-part structured question blends the tags of its parts using the same Hard-part decay as the paper profile.

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Full page with native tables, bar charts and Practice Hub links: https://www.examsci.com/past-papers/edexcel-ial/mathematics/mechanics-2-wme02/2018-january-wme02-01/