# 9709/51 May/June 2012

> 9709/51 May/June 2012: 7 questions, 50 marks. Difficulty 0.49, deviation 0.13, algebraic 0.39, text density 0.44. CIE IAL Mathematics 9709 P5.

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CIE IAL · Mathematics · 2012 May/June

This Mathematics 9709 Paper 5 (Mechanics 2) paper contains 7 questions worth 50 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.

- CIE IAL
- 9709 P5
- 7 questions
- 50 marks
- Free paper
- [Practise this paper](https://www.examsci.com/practice?set_id=246339c1-99c1-4b60-888d-97907d7f6995)
- [All 9709 P5 papers](https://www.examsci.com/past-papers/cie-ial/mathematics/9709-p5/)

Core finding

**9709/51 May/June 2012 is a past paper for CIE IAL Mathematics 9709 Paper 5 (Mechanics 2), with 7 questions worth 50 marks.** Its mark-weighted Difficulty Measure is 0.49 on a 0.20–0.75 scale, with a Difficulty Deviation of 0.13 and a mark split of 4.0% Easy, 70.0% Medium and 26.0% Hard. Algebraic complexity averages 0.39; text density and modelling average 0.44. All five measures use 13 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 13 parts carrying 50 part marks. Difficulty tags cover 13 parts, algebraic tags 13 and text-density tags 13. Tags are internal metadata, not official exam-board ratings.

- **Difficulty Measure**: 0.49 — 0.20–0.75 · nearer Medium
- **Difficulty Deviation**: 0.13 — 0 = uniform; higher = more mixed
- **Difficulty Ratio**: 4.0 / 70.0 / 26.0 — % Easy / Medium / Hard
- **Algebraic Complexity Measure**: 0.39 — 0.20–0.75 · nearer Medium
- **Text Density and Modelling Measure**: 0.44 — 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** | 0.49 | 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** | 4.0% Easy / 70.0% Medium / 26.0% Hard | marks in band / all tagged marks |
| **Algebraic Complexity Measure** | 0.39 | Σ(c_i × marks_i) / Σmarks_i, with c = 0.20 / 0.45 / 0.75 |
| **Text Density and Modelling Measure** | 0.44 | 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 | [3 Uniform motion in a circle](https://www.examsci.com/topics/cie-ial/mathematics/9709-p5/) | 2 | 0.20 Easy | 0.20 Low | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=246339c1-99c1-4b60-888d-97907d7f6995&question_id=07775dc1-a290-4dae-beec-9417076775fc&source_detail=9709%2F51+May%2FJune+2012) |
| **Q2** FRQ | [2 Equilibrium of a rigid body](https://www.examsci.com/topics/cie-ial/mathematics/9709-p5/) | 6 | 0.45 Medium | 0.20 Low | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=246339c1-99c1-4b60-888d-97907d7f6995&question_id=24c3c6e2-54b4-4a6e-bb3d-4a6415901579&source_detail=9709%2F51+May%2FJune+2012) |
| **Q3** FRQ | [3 Uniform motion in a circle](https://www.examsci.com/topics/cie-ial/mathematics/9709-p5/) | 7 | 0.45 Medium | 0.45 Medium | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=246339c1-99c1-4b60-888d-97907d7f6995&question_id=304d8023-6639-42d4-8efa-52beb4c94988&source_detail=9709%2F51+May%2FJune+2012) |
| **Q4** FRQ | [4 Hooke’s law](https://www.examsci.com/topics/cie-ial/mathematics/9709-p5/) | 8 | 0.45 Medium | 0.45 Medium | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=246339c1-99c1-4b60-888d-97907d7f6995&question_id=11d246bf-6b5e-41cd-bc46-c0b7d89b935f&source_detail=9709%2F51+May%2FJune+2012) |
| **Q5** FRQ | [5 Linear motion under a variable force](https://www.examsci.com/topics/cie-ial/mathematics/9709-p5/) | 9 | 0.65 Hard | 0.39 Medium | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=246339c1-99c1-4b60-888d-97907d7f6995&question_id=65525c05-03f4-4256-9d60-07579b0f5d23&source_detail=9709%2F51+May%2FJune+2012) |
| **Q6** FRQ | [2 Equilibrium of a rigid body](https://www.examsci.com/topics/cie-ial/mathematics/9709-p5/) | 9 | 0.62 Hard | 0.37 Medium | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=246339c1-99c1-4b60-888d-97907d7f6995&question_id=631c8f11-c402-4913-8ab0-664d0b214944&source_detail=9709%2F51+May%2FJune+2012) |
| **Q7** FRQ | [1 Motion of a projectile](https://www.examsci.com/topics/cie-ial/mathematics/9709-p5/) | 9 | 0.45 Medium | 0.45 Medium | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=246339c1-99c1-4b60-888d-97907d7f6995&question_id=019655c8-a5df-4d01-b44c-0d42404d6507&source_detail=9709%2F51+May%2FJune+2012) |

## Topics in this paper

- [3 Uniform motion in a circle](https://www.examsci.com/topics/cie-ial/mathematics/9709-p5/)
- [2 Equilibrium of a rigid body](https://www.examsci.com/topics/cie-ial/mathematics/9709-p5/)
- [4 Hooke’s law](https://www.examsci.com/topics/cie-ial/mathematics/9709-p5/)
- [5 Linear motion under a variable force](https://www.examsci.com/topics/cie-ial/mathematics/9709-p5/)
- [1 Motion of a projectile](https://www.examsci.com/topics/cie-ial/mathematics/9709-p5/)

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## 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 0.49 from 13 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 4.0% Easy, 70.0% Medium and 26.0% 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/cie-ial/mathematics/9709-p5/2012-may-june-9709-51/