# 9702/13 October/November 2019

> 9702/13 October/November 2019: 40 questions, 40 marks. Difficulty 0.31, deviation 0.14, algebraic 0.23, text density 0.34. CIE IAL Physics 9702 P1.

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CIE IAL · Physics · 2019 October/November

This Physics 9702 Paper 1 (Multiple Choice) paper contains 40 questions worth 40 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
- 9702 P1
- 40 questions
- 40 marks
- Free paper
- [Practise this paper](https://www.examsci.com/practice?set_id=6c1a308d-6f3a-43d1-9f1b-b594cc0d0b5c)
- [All 9702 P1 papers](https://www.examsci.com/past-papers/cie-ial/physics/9702-paper-1/)

Core finding

**9702/13 October/November 2019 is a past paper for CIE IAL Physics 9702 Paper 1 (Multiple Choice), with 40 questions worth 40 marks.** Its mark-weighted Difficulty Measure is 0.31 on a 0.20–0.75 scale, with a Difficulty Deviation of 0.14 and a mark split of 57.5% Easy, 40.0% Medium and 2.5% Hard. Algebraic complexity averages 0.23; text density and modelling average 0.34. All five measures use 40 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 40 parts carrying 40 part marks. Difficulty tags cover 40 parts, algebraic tags 40 and text-density tags 40. Tags are internal metadata, not official exam-board ratings.

- **Difficulty Measure**: 0.31 — 0.20–0.75 · nearer Easy
- **Difficulty Deviation**: 0.14 — 0 = uniform; higher = more mixed
- **Difficulty Ratio**: 57.5 / 40.0 / 2.5 — % Easy / Medium / Hard
- **Algebraic Complexity Measure**: 0.23 — 0.20–0.75 · nearer Low
- **Text Density and Modelling Measure**: 0.34 — 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** | 0.31 | Σ(d_i × w_i) / Σw_i, with d = 0.20 / 0.45 / 0.75 |
| **Difficulty Deviation** | 0.14 | √(Σw_i(d_i − μ)^2 / Σw_i) |
| **Difficulty Ratio** | 57.5% Easy / 40.0% Medium / 2.5% Hard | marks in band / all tagged marks |
| **Algebraic Complexity Measure** | 0.23 | Σ(c_i × marks_i) / Σmarks_i, with c = 0.20 / 0.45 / 0.75 |
| **Text Density and Modelling Measure** | 0.34 | 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 | [1.1 Physical quantities](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/physical-quantities/) | 1 | 0.20 Easy | 0.20 Low | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=6c1a308d-6f3a-43d1-9f1b-b594cc0d0b5c&question_id=b3fd7a6f-f3dc-4a52-a2f2-1a45272f0dbe&source_detail=9702%2F13+October%2FNovember+2019) |
| **Q2** FRQ | [1.2 SI units](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/si-units/) | 1 | 0.20 Easy | 0.20 Low | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=6c1a308d-6f3a-43d1-9f1b-b594cc0d0b5c&question_id=b0c8a6fc-b3b2-4164-8d49-eb361f5b865d&source_detail=9702%2F13+October%2FNovember+2019) |
| **Q3** FRQ | [1.4 Scalars and vectors](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/scalars-and-vectors/) | 1 | 0.20 Easy | 0.20 Low | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=6c1a308d-6f3a-43d1-9f1b-b594cc0d0b5c&question_id=a79ee2b7-f891-4c66-8e00-6efd0bc6a314&source_detail=9702%2F13+October%2FNovember+2019) |
| **Q4** FRQ | [2.2 Errors and uncertainties](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/errors-and-uncertainties/) | 1 | 0.20 Easy | 0.20 Low | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=6c1a308d-6f3a-43d1-9f1b-b594cc0d0b5c&question_id=156d8717-a30b-4787-a763-ade08d6ba977&source_detail=9702%2F13+October%2FNovember+2019) |
| **Q5** FRQ | [2.2 Errors and uncertainties](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/errors-and-uncertainties/) | 1 | 0.20 Easy | 0.20 Low | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=6c1a308d-6f3a-43d1-9f1b-b594cc0d0b5c&question_id=f27eff16-7246-4a8b-95b5-3aa3776adca1&source_detail=9702%2F13+October%2FNovember+2019) |
| **Q6** FRQ | [3.1 Equations of motion](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/equations-of-motion/) | 1 | 0.45 Medium | 0.20 Low | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=6c1a308d-6f3a-43d1-9f1b-b594cc0d0b5c&question_id=76dca64b-fccf-47f5-b4c4-90355071d5a3&source_detail=9702%2F13+October%2FNovember+2019) |
| **Q7** FRQ | [4.1 Momentum and Newton’s laws of motion](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/momentum-and-newton-s-laws-of-motion/) | 1 | 0.20 Easy | 0.20 Low | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=6c1a308d-6f3a-43d1-9f1b-b594cc0d0b5c&question_id=3e93cb5a-51ea-4b68-a1c4-1e37b56d4319&source_detail=9702%2F13+October%2FNovember+2019) |
| **Q8** FRQ | [4.2 Non-uniform motion](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/non-uniform-motion/) | 1 | 0.20 Easy | 0.20 Low | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=6c1a308d-6f3a-43d1-9f1b-b594cc0d0b5c&question_id=c4454522-0de2-49a8-8ed5-5d0baf7dca8c&source_detail=9702%2F13+October%2FNovember+2019) |
| **Q9** FRQ | [4.3 Linear momentum and its conservation](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/linear-momentum-and-its-conservation/) | 1 | 0.45 Medium | 0.20 Low | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=6c1a308d-6f3a-43d1-9f1b-b594cc0d0b5c&question_id=e776f3ce-cf92-466b-a27a-f3c5447c3191&source_detail=9702%2F13+October%2FNovember+2019) |
| **Q10** FRQ | [5.1 Types of force](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/) | 1 | 0.45 Medium | 0.20 Low | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=6c1a308d-6f3a-43d1-9f1b-b594cc0d0b5c&question_id=f6e4d6e3-4e7c-401c-beb2-9bd61300ef0f&source_detail=9702%2F13+October%2FNovember+2019) |
| **Q11** FRQ | [5.2 Turning effects of forces](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/turning-effects-of-forces/) | 1 | 0.45 Medium | 0.20 Low | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=6c1a308d-6f3a-43d1-9f1b-b594cc0d0b5c&question_id=94aec652-a9a9-41b0-9e24-c461bd63e120&source_detail=9702%2F13+October%2FNovember+2019) |
| **Q12** FRQ | [5.3 Equilibrium of forces](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/equilibrium-of-forces/) | 1 | 0.20 Easy | 0.20 Low | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=6c1a308d-6f3a-43d1-9f1b-b594cc0d0b5c&question_id=09a5a0d4-67d5-4521-bbbf-ca0e04e6ea67&source_detail=9702%2F13+October%2FNovember+2019) |
| **Q13** FRQ | [5.4 Density and pressure](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/density-and-pressure/) | 1 | 0.75 Hard | 0.45 Medium | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=6c1a308d-6f3a-43d1-9f1b-b594cc0d0b5c&question_id=764acb33-6740-4c5f-8166-a7ffb13524f9&source_detail=9702%2F13+October%2FNovember+2019) |
| **Q14** FRQ | [6.2 Work and efficiency](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/) | 1 | 0.20 Easy | 0.20 Low | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=6c1a308d-6f3a-43d1-9f1b-b594cc0d0b5c&question_id=491302ce-b18a-443f-92ef-7ae91338dd7e&source_detail=9702%2F13+October%2FNovember+2019) |
| **Q15** FRQ | [6.2 Work and efficiency](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/) | 1 | 0.20 Easy | 0.20 Low | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=6c1a308d-6f3a-43d1-9f1b-b594cc0d0b5c&question_id=c1cb22dc-ce6a-4ffa-a69c-1671b973f57e&source_detail=9702%2F13+October%2FNovember+2019) |
| **Q16** FRQ | [6.3 Potential energy and kinetic energy](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/) | 1 | 0.20 Easy | 0.20 Low | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=6c1a308d-6f3a-43d1-9f1b-b594cc0d0b5c&question_id=c5f6d380-a0ab-4a4d-a70f-b1329a242e9f&source_detail=9702%2F13+October%2FNovember+2019) |
| **Q17** FRQ | [6.4 Power](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/) | 1 | 0.20 Easy | 0.20 Low | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=6c1a308d-6f3a-43d1-9f1b-b594cc0d0b5c&question_id=611db560-cb1a-443c-9c1f-f906263f5ac7&source_detail=9702%2F13+October%2FNovember+2019) |
| **Q18** FRQ | [6.3 Potential energy and kinetic energy](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/) | 1 | 0.45 Medium | 0.20 Low | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=6c1a308d-6f3a-43d1-9f1b-b594cc0d0b5c&question_id=1259f9c9-ed2a-4122-978a-f58f2f5b9d5a&source_detail=9702%2F13+October%2FNovember+2019) |
| **Q19** FRQ | [9.1 Stress and strain](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/stress-and-strain/) | 1 | 0.45 Medium | 0.20 Low | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=6c1a308d-6f3a-43d1-9f1b-b594cc0d0b5c&question_id=045f591d-8079-4f27-bf8f-010716c9c295&source_detail=9702%2F13+October%2FNovember+2019) |
| **Q20** FRQ | [9.2 Elastic and plastic behaviour](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/elastic-and-plastic-behaviour/) | 1 | 0.20 Easy | 0.20 Low | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=6c1a308d-6f3a-43d1-9f1b-b594cc0d0b5c&question_id=c134576d-b456-4373-97bd-12aa7fac4fe8&source_detail=9702%2F13+October%2FNovember+2019) |
| **Q21** FRQ | [14.2 Transverse and longitudinal waves](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/transverse-and-longitudinal-waves/) | 1 | 0.20 Easy | 0.20 Low | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=6c1a308d-6f3a-43d1-9f1b-b594cc0d0b5c&question_id=449885ae-4c22-4fcc-9d41-27c7cc46c950&source_detail=9702%2F13+October%2FNovember+2019) |
| **Q22** FRQ | [14.1 Progressive waves](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/progressive-waves/) | 1 | 0.20 Easy | 0.20 Low | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=6c1a308d-6f3a-43d1-9f1b-b594cc0d0b5c&question_id=fc817f60-b1d0-42b6-975a-f5f36c6a5093&source_detail=9702%2F13+October%2FNovember+2019) |
| **Q23** FRQ | [14.3 Determination of frequency and wavelength of sound waves](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/) | 1 | 0.45 Medium | 0.20 Low | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=6c1a308d-6f3a-43d1-9f1b-b594cc0d0b5c&question_id=93ec467f-97d0-4a26-93c5-345c2468a374&source_detail=9702%2F13+October%2FNovember+2019) |
| **Q24** FRQ | [14.4 Doppler effect](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/) | 1 | 0.20 Easy | 0.20 Low | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=6c1a308d-6f3a-43d1-9f1b-b594cc0d0b5c&question_id=bcf66037-9b4a-4b5c-a00b-8fa32d5bcca5&source_detail=9702%2F13+October%2FNovember+2019) |
| **Q25** FRQ | [14.1 Progressive waves](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/progressive-waves/) | 1 | 0.20 Easy | 0.20 Low | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=6c1a308d-6f3a-43d1-9f1b-b594cc0d0b5c&question_id=5f452491-15d3-4364-a985-0f035f62cdaa&source_detail=9702%2F13+October%2FNovember+2019) |
| **Q26** FRQ | [15.1 Stationary waves](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/stationary-waves/) | 1 | 0.45 Medium | 0.20 Low | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=6c1a308d-6f3a-43d1-9f1b-b594cc0d0b5c&question_id=3b152ea0-21fb-45aa-9bbd-84173aea39aa&source_detail=9702%2F13+October%2FNovember+2019) |
| **Q27** FRQ | [14.1 Progressive waves](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/progressive-waves/) | 1 | 0.20 Easy | 0.20 Low | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=6c1a308d-6f3a-43d1-9f1b-b594cc0d0b5c&question_id=86e0d9c5-9e73-4166-bb00-0d64a129955b&source_detail=9702%2F13+October%2FNovember+2019) |
| **Q28** FRQ | [15.1 Stationary waves](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/stationary-waves/) | 1 | 0.45 Medium | 0.20 Low | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=6c1a308d-6f3a-43d1-9f1b-b594cc0d0b5c&question_id=b905aade-320f-4448-912d-557e3b8f28e6&source_detail=9702%2F13+October%2FNovember+2019) |
| **Q29** FRQ | [15.3 Interference, two-source interference](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/) | 1 | 0.45 Medium | 0.20 Low | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=6c1a308d-6f3a-43d1-9f1b-b594cc0d0b5c&question_id=3e402e93-9757-4f57-a584-597341f80248&source_detail=9702%2F13+October%2FNovember+2019) |
| **Q30** FRQ | [15.4 Diffraction gratings](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/) | 1 | 0.45 Medium | 0.45 Medium | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=6c1a308d-6f3a-43d1-9f1b-b594cc0d0b5c&question_id=55dcbb28-dadb-4bd6-8d26-ac01c9a6bca8&source_detail=9702%2F13+October%2FNovember+2019) |
| **Q31** FRQ | [17.1 Concept of an electric field](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/) | 1 | 0.20 Easy | 0.20 Low | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=6c1a308d-6f3a-43d1-9f1b-b594cc0d0b5c&question_id=2118c28d-00b7-4da6-a246-5f63da7d8b8d&source_detail=9702%2F13+October%2FNovember+2019) |
| **Q32** FRQ | [17.2 Uniform electric fields](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/) | 1 | 0.20 Easy | 0.20 Low | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=6c1a308d-6f3a-43d1-9f1b-b594cc0d0b5c&question_id=57603e15-907f-4226-a962-2d23921afb7a&source_detail=9702%2F13+October%2FNovember+2019) |
| **Q33** FRQ | [19.1 Electric current](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/electric-current/) | 1 | 0.45 Medium | 0.20 Low | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=6c1a308d-6f3a-43d1-9f1b-b594cc0d0b5c&question_id=a2247dea-28a9-4025-8f5f-4c005836e9fb&source_detail=9702%2F13+October%2FNovember+2019) |
| **Q34** FRQ | [19.2 Potential difference and power](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/potential-difference-and-power/) | 1 | 0.45 Medium | 0.45 Medium | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=6c1a308d-6f3a-43d1-9f1b-b594cc0d0b5c&question_id=f6db5d40-25ae-42d8-bb98-7cb9cfad8b9f&source_detail=9702%2F13+October%2FNovember+2019) |
| **Q35** FRQ | [19.3 Resistance and resistivity](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/resistance-and-resistivity/) | 1 | 0.45 Medium | 0.20 Low | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=6c1a308d-6f3a-43d1-9f1b-b594cc0d0b5c&question_id=cac7f2db-bf54-4d88-9b3b-d34f807bd8dd&source_detail=9702%2F13+October%2FNovember+2019) |
| **Q36** FRQ | [20.1 Practical circuits](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/practical-circuits/) | 1 | 0.45 Medium | 0.20 Low | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=6c1a308d-6f3a-43d1-9f1b-b594cc0d0b5c&question_id=f1909915-5976-427e-91ed-2e9da57178eb&source_detail=9702%2F13+October%2FNovember+2019) |
| **Q37** FRQ | [20.2 Kirchhoff’s laws](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/kirchhoff-s-laws/) | 1 | 0.20 Easy | 0.20 Low | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=6c1a308d-6f3a-43d1-9f1b-b594cc0d0b5c&question_id=91228239-46fa-46b1-a633-70bb6938954d&source_detail=9702%2F13+October%2FNovember+2019) |
| **Q38** FRQ | [20.2 Kirchhoff’s laws](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/kirchhoff-s-laws/) | 1 | 0.45 Medium | 0.45 Medium | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=6c1a308d-6f3a-43d1-9f1b-b594cc0d0b5c&question_id=909ffac8-087b-4bb2-a1e3-7852382258df&source_detail=9702%2F13+October%2FNovember+2019) |
| **Q39** FRQ | [26.1 Atoms, nuclei and radiation](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/atoms-nuclei-and-radiation/) | 1 | 0.20 Easy | 0.20 Low | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=6c1a308d-6f3a-43d1-9f1b-b594cc0d0b5c&question_id=02e552af-4c3c-43f1-b30a-f39d30caf8ad&source_detail=9702%2F13+October%2FNovember+2019) |
| **Q40** FRQ | [26.2 Fundamental particles](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/fundamental-particles/) | 1 | 0.20 Easy | 0.20 Low | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=6c1a308d-6f3a-43d1-9f1b-b594cc0d0b5c&question_id=87062375-17a8-45aa-b5f0-ccc106bbe273&source_detail=9702%2F13+October%2FNovember+2019) |

## Topics in this paper

- [1.1 Physical quantities](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/physical-quantities/)
- [19.2 Potential difference and power](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/potential-difference-and-power/)
- [1.2 SI units](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/si-units/)
- [1.4 Scalars and vectors](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/scalars-and-vectors/)
- [2.2 Errors and uncertainties](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/errors-and-uncertainties/)
- [3.1 Equations of motion](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/equations-of-motion/)
- [4.1 Momentum and Newton’s laws of motion](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/momentum-and-newton-s-laws-of-motion/)
- [4.2 Non-uniform motion](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/non-uniform-motion/)
- [4.3 Linear momentum and its conservation](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/linear-momentum-and-its-conservation/)
- [5.1 Types of force](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/)
- [5.2 Turning effects of forces](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/turning-effects-of-forces/)
- [5.3 Equilibrium of forces](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/equilibrium-of-forces/)

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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 0.31 from 40 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 0.14, 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 57.5% Easy, 40.0% Medium and 2.5% 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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