# 9709/42 October/November 2011

> 9709/42 October/November 2011: 7 questions, 50 marks. Difficulty 0.36, deviation 0.15, algebraic 0.32, text density 0.47. CIE IAL Mathematics 9709 P4.

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CIE IAL · Mathematics · 2011 October/November

This Mathematics 9709 Paper 4 (Mechanics) 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 P4
- 7 questions
- 50 marks
- Free paper
- [Practise this paper](https://www.examsci.com/practice?set_id=09334252-0d0e-4d39-b320-103838217bb8)
- [All 9709 P4 papers](https://www.examsci.com/past-papers/cie-ial/mathematics/9709-p4/)

Core finding

**9709/42 October/November 2011 is a past paper for CIE IAL Mathematics 9709 Paper 4 (Mechanics), with 7 questions worth 50 marks.** Its mark-weighted Difficulty Measure is 0.36 on a 0.20–0.75 scale, with a Difficulty Deviation of 0.15 and a mark split of 42.0% Easy, 50.0% Medium and 8.0% Hard. Algebraic complexity averages 0.32; text density and modelling average 0.47. All five measures use 17 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 17 parts carrying 50 part marks. Difficulty tags cover 17 parts, algebraic tags 17 and text-density tags 17. Tags are internal metadata, not official exam-board ratings.

- **Difficulty Measure**: 0.36 — 0.20–0.75 · nearer Medium
- **Difficulty Deviation**: 0.15 — 0 = uniform; higher = more mixed
- **Difficulty Ratio**: 42.0 / 50.0 / 8.0 — % Easy / Medium / Hard
- **Algebraic Complexity Measure**: 0.32 — 0.20–0.75 · nearer Low
- **Text Density and Modelling Measure**: 0.47 — 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** | 0.36 | 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** | 42.0% Easy / 50.0% Medium / 8.0% Hard | marks in band / all tagged marks |
| **Algebraic Complexity Measure** | 0.32 | Σ(c_i × marks_i) / Σmarks_i, with c = 0.20 / 0.45 / 0.75 |
| **Text Density and Modelling Measure** | 0.47 | 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 Energy, work and power](https://www.examsci.com/topics/cie-ial/mathematics/9709-p4/energy-work-and-power/) | 5 | 0.20 Easy | 0.20 Low | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=09334252-0d0e-4d39-b320-103838217bb8&question_id=a8bda5cf-19d8-4bc2-9b0c-f78a8e5120df&source_detail=9709%2F42+October%2FNovember+2011) |
| **Q2** FRQ | [3 Newton’s laws of motion](https://www.examsci.com/topics/cie-ial/mathematics/9709-p4/newton-s-laws-of-motion/) | 5 | 0.20 Easy | 0.20 Low | 0.35 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=09334252-0d0e-4d39-b320-103838217bb8&question_id=aab9ea24-157e-4482-9d4c-0ca816701dbc&source_detail=9709%2F42+October%2FNovember+2011) |
| **Q3** FRQ | [2 Kinematics of motion in a straight line](https://www.examsci.com/topics/cie-ial/mathematics/9709-p4/kinematics-of-motion-in-a-straight-line/) | 6 | 0.45 Medium | 0.45 Medium | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=09334252-0d0e-4d39-b320-103838217bb8&question_id=ad0bfbe2-dd2a-4440-9221-3cd135927b74&source_detail=9709%2F42+October%2FNovember+2011) |
| **Q4** FRQ | [1 Forces and equilibrium](https://www.examsci.com/topics/cie-ial/mathematics/9709-p4/forces-and-equilibrium/) | 5 | 0.35 Medium | 0.35 Medium | 0.35 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=09334252-0d0e-4d39-b320-103838217bb8&question_id=cac21232-ca23-4c5a-9a32-ded787b15264&source_detail=9709%2F42+October%2FNovember+2011) |
| **Q5** FRQ | [3 Newton’s laws of motion](https://www.examsci.com/topics/cie-ial/mathematics/9709-p4/newton-s-laws-of-motion/) | 8 | 0.33 Medium | 0.33 Medium | 0.60 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=09334252-0d0e-4d39-b320-103838217bb8&question_id=38b241f7-83fb-44d0-a343-04b613fdafe4&source_detail=9709%2F42+October%2FNovember+2011) |
| **Q6** FRQ | [4 Energy, work and power](https://www.examsci.com/topics/cie-ial/mathematics/9709-p4/energy-work-and-power/) | 10 | 0.52 Medium | 0.42 Medium | 0.70 High | [Go to Practice Hub](https://www.examsci.com/practice?set_id=09334252-0d0e-4d39-b320-103838217bb8&question_id=adba8124-f2b0-4325-8b04-c9e00e0e57af&source_detail=9709%2F42+October%2FNovember+2011) |
| **Q7** FRQ | [2 Kinematics of motion in a straight line](https://www.examsci.com/topics/cie-ial/mathematics/9709-p4/kinematics-of-motion-in-a-straight-line/) | 11 | 0.36 Medium | 0.25 Low | 0.31 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=09334252-0d0e-4d39-b320-103838217bb8&question_id=d068d49b-23a0-48b8-81cb-ecb4801e4c6f&source_detail=9709%2F42+October%2FNovember+2011) |

## Topics in this paper

- [4 Energy, work and power](https://www.examsci.com/topics/cie-ial/mathematics/9709-p4/energy-work-and-power/)
- [3 Newton’s laws of motion](https://www.examsci.com/topics/cie-ial/mathematics/9709-p4/newton-s-laws-of-motion/)
- [1 Forces and equilibrium](https://www.examsci.com/topics/cie-ial/mathematics/9709-p4/forces-and-equilibrium/)
- [2 Kinematics of motion in a straight line](https://www.examsci.com/topics/cie-ial/mathematics/9709-p4/kinematics-of-motion-in-a-straight-line/)

## Related papers

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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 0.36 from 17 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 42.0% Easy, 50.0% 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/cie-ial/mathematics/9709-p4/2011-october-november-9709-42/