# 9702/13 May/June 2020

> 9702/13 May/June 2020: 40 questions, 40 marks. Difficulty 0.28, deviation 0.13, algebraic 0.26, text density 0.36. CIE IAL Physics 9702 P1.

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CIE IAL · Physics · 2020 May/June

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=4eb3be3c-da25-447c-bc63-9e2f05d95c56)
- [All 9702 P1 papers](https://www.examsci.com/past-papers/cie-ial/physics/9702-paper-1/)

Core finding

**9702/13 May/June 2020 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 0.28 on a 0.20–0.75 scale, with a Difficulty Deviation of 0.13 and a mark split of 70.0% Easy, 27.5% Medium and 2.5% Hard. Algebraic complexity averages 0.26; text density and modelling average 0.36. 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**: 0.28 — 0.20–0.75 · nearer Easy
- **Difficulty Deviation**: 0.13 — 0 = uniform; higher = more mixed
- **Difficulty Ratio**: 70.0 / 27.5 / 2.5 — % Easy / Medium / Hard
- **Algebraic Complexity Measure**: 0.26 — 0.20–0.75 · nearer Low
- **Text Density and Modelling Measure**: 0.36 — 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** | 0.28 | 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** | 70.0% Easy / 27.5% Medium / 2.5% Hard | marks in band / all tagged marks |
| **Algebraic Complexity Measure** | 0.26 | Σ(c_i × marks_i) / Σmarks_i, with c = 0.20 / 0.45 / 0.75 |
| **Text Density and Modelling Measure** | 0.36 | 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 | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=4eb3be3c-da25-447c-bc63-9e2f05d95c56&question_id=22b38c00-7497-402b-86d5-93b24387eecf&source_detail=9702%2F13+May%2FJune+2020) |
| **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=4eb3be3c-da25-447c-bc63-9e2f05d95c56&question_id=06287ae6-958a-49a3-85c7-56a655b4ede2&source_detail=9702%2F13+May%2FJune+2020) |
| **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=4eb3be3c-da25-447c-bc63-9e2f05d95c56&question_id=04707a13-dac8-4fb3-a212-da274f5015fb&source_detail=9702%2F13+May%2FJune+2020) |
| **Q4** FRQ | [2.1 Measurements](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=4eb3be3c-da25-447c-bc63-9e2f05d95c56&question_id=9cfb92df-3e33-41d0-8380-819d5eaedd9b&source_detail=9702%2F13+May%2FJune+2020) |
| **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 | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=4eb3be3c-da25-447c-bc63-9e2f05d95c56&question_id=ebe6ba9b-3c05-4a2d-ba3b-cacc191de96a&source_detail=9702%2F13+May%2FJune+2020) |
| **Q6** FRQ | [3.1 Equations of motion](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/equations-of-motion/) | 1 | 0.20 Easy | 0.20 Low | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=4eb3be3c-da25-447c-bc63-9e2f05d95c56&question_id=a73c5ec7-f288-4a69-94c5-1833b41c6de8&source_detail=9702%2F13+May%2FJune+2020) |
| **Q7** FRQ | [3.1 Equations of motion](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/equations-of-motion/) | 1 | 0.20 Easy | 0.20 Low | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=4eb3be3c-da25-447c-bc63-9e2f05d95c56&question_id=436459c7-d2d6-4518-93fe-17aa8e22ff97&source_detail=9702%2F13+May%2FJune+2020) |
| **Q8** 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 | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=4eb3be3c-da25-447c-bc63-9e2f05d95c56&question_id=218f058a-de3e-44ce-ad83-55b063841167&source_detail=9702%2F13+May%2FJune+2020) |
| **Q9** FRQ | [4.2 Non-uniform motion](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/non-uniform-motion/) | 1 | 0.45 Medium | 0.45 Medium | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=4eb3be3c-da25-447c-bc63-9e2f05d95c56&question_id=c35b75af-a49b-46fc-9f61-25360a86ae0a&source_detail=9702%2F13+May%2FJune+2020) |
| **Q10** 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 | 0.45 Medium | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=4eb3be3c-da25-447c-bc63-9e2f05d95c56&question_id=a1c09595-7ee1-48a9-b553-ec86fdea5af2&source_detail=9702%2F13+May%2FJune+2020) |
| **Q11** FRQ | [5.1 Types of force](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=4eb3be3c-da25-447c-bc63-9e2f05d95c56&question_id=a957f63c-09f2-4977-96bc-352c8f5726da&source_detail=9702%2F13+May%2FJune+2020) |
| **Q12** FRQ | [5.2 Turning effects of forces](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/turning-effects-of-forces/) | 1 | 0.20 Easy | 0.20 Low | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=4eb3be3c-da25-447c-bc63-9e2f05d95c56&question_id=8abdcad9-867f-4e59-8f37-61ee5d61c23d&source_detail=9702%2F13+May%2FJune+2020) |
| **Q13** 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 | 0.45 Medium | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=4eb3be3c-da25-447c-bc63-9e2f05d95c56&question_id=65e52d4e-9dc0-4856-90b1-00e2e2194cc2&source_detail=9702%2F13+May%2FJune+2020) |
| **Q14** FRQ | [5.3 Equilibrium of forces](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/equilibrium-of-forces/) | 1 | 0.45 Medium | 0.20 Low | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=4eb3be3c-da25-447c-bc63-9e2f05d95c56&question_id=48c2ac77-824b-434e-816b-951526e16488&source_detail=9702%2F13+May%2FJune+2020) |
| **Q15** FRQ | [5.4 Density and pressure](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/density-and-pressure/) | 1 | 0.20 Easy | 0.20 Low | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=4eb3be3c-da25-447c-bc63-9e2f05d95c56&question_id=4a448506-451c-4439-bee1-63966e82c3f2&source_detail=9702%2F13+May%2FJune+2020) |
| **Q16** FRQ | [6.1 Energy conversion and conservation](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=4eb3be3c-da25-447c-bc63-9e2f05d95c56&question_id=b403f9e7-1f0a-4658-b360-c8a6b7fbe79c&source_detail=9702%2F13+May%2FJune+2020) |
| **Q17** 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=4eb3be3c-da25-447c-bc63-9e2f05d95c56&question_id=a07a6d2c-885f-411d-aa40-163e901ff984&source_detail=9702%2F13+May%2FJune+2020) |
| **Q18** FRQ | [6.1 Energy conversion and conservation](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=4eb3be3c-da25-447c-bc63-9e2f05d95c56&question_id=fc890ce6-ad11-4496-8b94-d14968808fe1&source_detail=9702%2F13+May%2FJune+2020) |
| **Q19** 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 | 0.45 Medium | 0.45 Medium | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=4eb3be3c-da25-447c-bc63-9e2f05d95c56&question_id=3d6c53c5-9d85-4db8-9f51-93e2265119af&source_detail=9702%2F13+May%2FJune+2020) |
| **Q20** FRQ | [9.1 Stress and strain](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/stress-and-strain/) | 1 | 0.45 Medium | 0.45 Medium | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=4eb3be3c-da25-447c-bc63-9e2f05d95c56&question_id=b38127c4-8dcf-4b10-8dd8-b8df48212cd2&source_detail=9702%2F13+May%2FJune+2020) |
| **Q21** 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 | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=4eb3be3c-da25-447c-bc63-9e2f05d95c56&question_id=9c8688a4-9e22-4f8c-a9cf-0935c0aedda1&source_detail=9702%2F13+May%2FJune+2020) |
| **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=4eb3be3c-da25-447c-bc63-9e2f05d95c56&question_id=affb3d6f-a1d1-48d6-a007-d9ef65f132ea&source_detail=9702%2F13+May%2FJune+2020) |
| **Q23** 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=4eb3be3c-da25-447c-bc63-9e2f05d95c56&question_id=31de9576-5dee-4df5-a16d-b979900e556a&source_detail=9702%2F13+May%2FJune+2020) |
| **Q24** FRQ | [14.1 Progressive waves](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/progressive-waves/) | 1 | 0.45 Medium | 0.45 Medium | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=4eb3be3c-da25-447c-bc63-9e2f05d95c56&question_id=0a47a70f-08c0-4c15-9d83-6a2f6f414a81&source_detail=9702%2F13+May%2FJune+2020) |
| **Q25** FRQ | [14.4 Doppler effect](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=4eb3be3c-da25-447c-bc63-9e2f05d95c56&question_id=4e2e0f83-a0b6-4928-b843-8fac56e665a7&source_detail=9702%2F13+May%2FJune+2020) |
| **Q26** FRQ | [14.5 Electromagnetic spectrum](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/electromagnetic-spectrum/) | 1 | 0.20 Easy | 0.20 Low | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=4eb3be3c-da25-447c-bc63-9e2f05d95c56&question_id=0f46fd53-ed0e-42c6-a3b1-9a82198373ac&source_detail=9702%2F13+May%2FJune+2020) |
| **Q27** FRQ | [15.1 Stationary waves](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/stationary-waves/) | 1 | 0.45 Medium | 0.45 Medium | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=4eb3be3c-da25-447c-bc63-9e2f05d95c56&question_id=2a0724ba-451c-46fa-85d9-eeacdafb85a8&source_detail=9702%2F13+May%2FJune+2020) |
| **Q28** FRQ | [15.2 Diffraction](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/diffraction/) | 1 | 0.20 Easy | 0.20 Low | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=4eb3be3c-da25-447c-bc63-9e2f05d95c56&question_id=ac4da02a-de41-4765-a359-8c56b6cd153a&source_detail=9702%2F13+May%2FJune+2020) |
| **Q29** FRQ | [15.3 Interference, two-source interference](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=4eb3be3c-da25-447c-bc63-9e2f05d95c56&question_id=41a5f40e-1f15-4b13-8906-7ccce4a93a7d&source_detail=9702%2F13+May%2FJune+2020) |
| **Q30** FRQ | [15.4 Diffraction gratings](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=4eb3be3c-da25-447c-bc63-9e2f05d95c56&question_id=c7019e04-892b-443a-bcdd-c5f16f9af60c&source_detail=9702%2F13+May%2FJune+2020) |
| **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=4eb3be3c-da25-447c-bc63-9e2f05d95c56&question_id=41594f4b-f51a-403f-852e-4cc09aeaaace&source_detail=9702%2F13+May%2FJune+2020) |
| **Q32** FRQ | [17.2 Uniform electric fields](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/) | 1 | 0.75 Hard | 0.45 Medium | 0.75 High | [Go to Practice Hub](https://www.examsci.com/practice?set_id=4eb3be3c-da25-447c-bc63-9e2f05d95c56&question_id=fe9c4a87-4dfb-4b19-8791-4c94916c7e36&source_detail=9702%2F13+May%2FJune+2020) |
| **Q33** FRQ | [19.1 Electric current](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/electric-current/) | 1 | 0.20 Easy | 0.20 Low | 0.20 Low | [Go to Practice Hub](https://www.examsci.com/practice?set_id=4eb3be3c-da25-447c-bc63-9e2f05d95c56&question_id=daa79871-3306-4ef5-9e23-055e2f4a66d0&source_detail=9702%2F13+May%2FJune+2020) |
| **Q34** FRQ | [19.1 Electric current](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/electric-current/) | 1 | 0.20 Easy | 0.20 Low | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=4eb3be3c-da25-447c-bc63-9e2f05d95c56&question_id=b724f50a-a860-4adc-9809-d3029cff7ca6&source_detail=9702%2F13+May%2FJune+2020) |
| **Q35** 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=4eb3be3c-da25-447c-bc63-9e2f05d95c56&question_id=b8b63d4b-e606-4f8a-8024-9792657d36eb&source_detail=9702%2F13+May%2FJune+2020) |
| **Q36** FRQ | [19.3 Resistance and resistivity](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/resistance-and-resistivity/) | 1 | 0.20 Easy | 0.20 Low | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=4eb3be3c-da25-447c-bc63-9e2f05d95c56&question_id=b43ece8a-b13a-4667-931c-f00ac8df5f47&source_detail=9702%2F13+May%2FJune+2020) |
| **Q37** FRQ | [20.1 Practical circuits](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/practical-circuits/) | 1 | 0.45 Medium | 0.45 Medium | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=4eb3be3c-da25-447c-bc63-9e2f05d95c56&question_id=76005916-26e2-4dde-98f4-af5ea431119c&source_detail=9702%2F13+May%2FJune+2020) |
| **Q38** FRQ | [20.3 Potential dividers](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/potential-dividers/) | 1 | 0.20 Easy | 0.20 Low | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=4eb3be3c-da25-447c-bc63-9e2f05d95c56&question_id=33e2bb4c-c1f3-4f1a-bd7d-f4c402599c2b&source_detail=9702%2F13+May%2FJune+2020) |
| **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=4eb3be3c-da25-447c-bc63-9e2f05d95c56&question_id=f6d86eb8-1c19-45cf-96f0-14e1a07b696f&source_detail=9702%2F13+May%2FJune+2020) |
| **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=4eb3be3c-da25-447c-bc63-9e2f05d95c56&question_id=14a4b239-b031-42cf-8031-0d922813e3ff&source_detail=9702%2F13+May%2FJune+2020) |

## Topics in this paper

- [1.1 Physical quantities](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/physical-quantities/)
- [6.3 Potential energy and kinetic energy](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/)
- [1.2 SI units](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/si-units/)
- [5.4 Density and pressure](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/density-and-pressure/)
- [1.4 Scalars and vectors](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/scalars-and-vectors/)
- [2.1 Measurements](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/)
- [19.2 Potential difference and power](https://www.examsci.com/topics/cie-ial/physics/9702-paper-1/potential-difference-and-power/)
- [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/)

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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 0.28 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 0.13, 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 70.0% Easy, 27.5% 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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