# WME02/01 January 2015

> WME02/01 January 2015: 7 questions, 75 marks. Difficulty 0.38, deviation 0.15, algebraic 0.35, text density 0.39. Edexcel IAL Mathematics M2.

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Edexcel IAL · Mathematics · 2015 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=eebe2acb-73f0-4828-8ed5-e91b758671b7)
- [All M2 papers](https://www.examsci.com/past-papers/edexcel-ial/mathematics/mechanics-2-wme02/)

Core finding

**WME02/01 January 2015 is a past paper for Edexcel IAL Mechanics 2 (WME02), with 7 questions worth 75 marks.** Its mark-weighted Difficulty Measure is 0.38 on a 0.20–0.75 scale, with a Difficulty Deviation of 0.15 and a mark split of 33.3% Easy, 58.7% Medium and 8.0% Hard. Algebraic complexity averages 0.35; text density and modelling average 0.39. All five measures use 19 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 19 parts carrying 75 part marks. Difficulty tags cover 19 parts, algebraic tags 19 and text-density tags 19. Tags are internal metadata, not official exam-board ratings.

- **Difficulty Measure**: 0.38 — 0.20–0.75 · nearer Medium
- **Difficulty Deviation**: 0.15 — 0 = uniform; higher = more mixed
- **Difficulty Ratio**: 33.3 / 58.7 / 8.0 — % Easy / Medium / Hard
- **Algebraic Complexity Measure**: 0.35 — 0.20–0.75 · nearer Medium
- **Text Density and Modelling Measure**: 0.39 — 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** | 0.38 | Σ(d_i × w_i) / Σw_i, with d = 0.20 / 0.45 / 0.75 |
| **Difficulty Deviation** | 0.15 | √(Σw_i(d_i − μ)^2 / Σw_i) |
| **Difficulty Ratio** | 33.3% Easy / 58.7% Medium / 8.0% Hard | marks in band / all tagged marks |
| **Algebraic Complexity Measure** | 0.35 | Σ(c_i × marks_i) / Σmarks_i, with c = 0.20 / 0.45 / 0.75 |
| **Text Density and Modelling Measure** | 0.39 | 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/) | 7 | 0.20 Easy | 0.20 Low | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=eebe2acb-73f0-4828-8ed5-e91b758671b7&question_id=38ecadd6-30e0-44cf-be62-ac95ac81bae1&source_detail=WME02%2F01+January+2015) |
| **Q2** FRQ | [3. Work and energy](https://www.examsci.com/topics/edexcel-ial/mathematics/mechanics-2-wme02/work-and-energy/) | 9 | 0.45 Medium | 0.20 Low | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=eebe2acb-73f0-4828-8ed5-e91b758671b7&question_id=cce6395e-ed3e-40bf-9f04-e82c46c0884e&source_detail=WME02%2F01+January+2015) |
| **Q3** 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/) | 12 | 0.20 Easy | 0.20 Low | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=eebe2acb-73f0-4828-8ed5-e91b758671b7&question_id=7428eda7-3ab0-426d-8f47-9297e2cdb6f4&source_detail=WME02%2F01+January+2015) |
| **Q4** FRQ | [2. Centres of mass](https://www.examsci.com/topics/edexcel-ial/mathematics/mechanics-2-wme02/centres-of-mass/) | 9 | 0.45 Medium | 0.45 Medium | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=eebe2acb-73f0-4828-8ed5-e91b758671b7&question_id=3904bff6-7970-4afa-811c-b5f539501d21&source_detail=WME02%2F01+January+2015) |
| **Q5** FRQ | [5. Statics of rigid bodies](https://www.examsci.com/topics/edexcel-ial/mathematics/mechanics-2-wme02/statics-of-rigid-bodies/) | 12 | 0.45 Medium | 0.45 Medium | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=eebe2acb-73f0-4828-8ed5-e91b758671b7&question_id=1242bd8f-7f5f-4ba5-b7f0-95207ab29f2d&source_detail=WME02%2F01+January+2015) |
| **Q6** FRQ | [3. Work and energy](https://www.examsci.com/topics/edexcel-ial/mathematics/mechanics-2-wme02/work-and-energy/) | 12 | 0.37 Medium | 0.30 Low | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=eebe2acb-73f0-4828-8ed5-e91b758671b7&question_id=f749a2ae-e3e3-47a6-842a-a683a1f14e03&source_detail=WME02%2F01+January+2015) |
| **Q7** FRQ | [4. Collisions](https://www.examsci.com/topics/edexcel-ial/mathematics/mechanics-2-wme02/collisions/) | 14 | 0.50 Medium | 0.54 Medium | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=eebe2acb-73f0-4828-8ed5-e91b758671b7&question_id=55b38b1b-8db4-41ef-b3eb-8b7d3ec2ebca&source_detail=WME02%2F01+January+2015) |

## 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-wme02/2015-june-wme02-01/) — June 2015 — 7 questions · 75 marks — Free
- [WME02/01](https://www.examsci.com/past-papers/edexcel-ial/mathematics/mechanics-2-wme02/2016-october-wme02-01/) — October 2016 — 8 questions · 75 marks — Free
- [WME02/01](https://www.examsci.com/past-papers/edexcel-ial/mathematics/mechanics-2-wme02/2016-june-wme02-01/) — June 2016 — 7 questions · 75 marks — Free
- [WME02/01](https://www.examsci.com/past-papers/edexcel-ial/mathematics/mechanics-2-wme02/2016-january-wme02-01/) — January 2016 — 7 questions · 75 marks — Free
- [WME02/01](https://www.examsci.com/past-papers/edexcel-ial/mathematics/mechanics-2-wme02/2014-june-wme02-01/) — June 2014 — 7 questions · 75 marks — Free
- [WME02/01](https://www.examsci.com/past-papers/edexcel-ial/mathematics/mechanics-2-wme02/2014-january-wme02-01/) — January 2014 — 7 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 0.38 from 19 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 0.15, 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 33.3% Easy, 58.7% Medium and 8.0% 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-wme02/2015-january-wme02-01/