OCR A Level Physics A: Modelling, Exploring and Unified – What Each Paper Wants

OCR A Level Physics A (H556) is linear and untiered, assessed by three examined components totalling 270 marks. Paper 1 (Modelling physics) and Paper 2 (Exploring physics) are each 2 hours 15 minutes, 100 marks and 37%. Paper 3 (Unified physics) is 1 hour 30 minutes, 70 marks and 26%, and draws on all modules; the specification states that all components include synoptic assessment. Alongside them sits the Practical Endorsement, a non-exam assessment requiring at least twelve practical activities, internally assessed and reported separately as Pass or Not Classified – it contributes no marks to the 270-mark total that determines the A*-E grade. These notes complement the site’s guides to Foundations of Physics and Development of Practical Skills.

The two 100-mark papers differ by module, not by style

Modelling physics (Component 01) assesses modules 1, 2, 3 and 5; Exploring physics (Component 02) assesses modules 1, 2, 4 and 6. The specification gives both the same structure (Section A, 15 marks of multiple choice; Section B, 85 marks of structured, problem-solving, calculation, practical and extended-response questions) and the same assessment-objective weightings. Exam-preparation priority: map your revision to the modules each paper assesses – Forces and motion and Newtonian world and astrophysics for Paper 1; Electrons, waves and photons and Particles and medical physics for Paper 2 – and keep modules 1 and 2 (practical skills and foundations) live for both.

Paper 3’s 70 marks require whole-course fluency in 90 minutes

Unified physics draws on every module, and it does so under the tightest clock of the three papers. Exam-preparation priority: revise across modules deliberately in the final weeks, and practise recognising quickly which area of physics a question belongs to. All three components include synoptic assessment, but Paper 3 draws on every module, so the time cost of misidentifying the relevant physics is highest there.

The Practical Endorsement carries no marks – practical skills still carry many

The separate reporting of the Endorsement makes it easy to under-invest in practical work. But experimental design, uncertainty, error analysis and the evaluation of data are examined within the 270 marks, on all three papers. Exam-preparation priority: revise the practical activities for what the written papers ask – instrument precision, absolute and percentage uncertainty, how uncertainties combine, and improvements that target a named source of error.

Uncertainty work is a distinct, learnable and reliably examined skill

Percentage uncertainty, combining uncertainties through a calculation, and deciding on appropriate significant figures are all examinable and all mechanical once learned. Exam-preparation priority: practise them explicitly rather than absorbing them incidentally. These marks are among the most predictable on the specification and among the most commonly dropped.

Graph work carries both analysis and evaluation marks

Physics at this level uses graphs quantitatively: gradients, intercepts, areas, and the linearisation of a relationship so that a straight-line fit tests a proposed law. Exam-preparation priority: practise deciding what to plot against what in order to obtain a straight line, and stating what the gradient and intercept represent physically. That is the step most often missing from otherwise competent graph answers.

Worked routine: an estimation or “show that” question

The routine below is an original model written for this resource, not a reproduction of any official past paper or mark scheme.

Step 1 - state every assumption you are making:
"Assuming the object is a uniform sphere and air resistance is
negligible..." Assumptions are frequently creditable in
themselves.

Step 2 - write the physical relationship being used:
Symbols first, before any numbers.

Step 3 - convert all quantities to SI units in writing:
Especially prefixes -- nanometres, gigapascals, kilowatt-hours.

Step 4 - carry the calculation with unrounded intermediates:
Round only the final value, to a sensible number of significant
figures.

Step 5 - check the order of magnitude against something known:
Is this energy comparable to a familiar quantity? Is the speed
below c? An implausible order of magnitude almost always signals
a prefix error rather than a conceptual one.

Step 1 does real work on this specification: “show that” and estimation questions frequently allocate marks for recognising what has been idealised away.

Before/during exam checklist

• Before the exams: prepare for the different emphases of Modelling and Exploring physics, not just their different content; revise across modules for Paper 3; revise practicals for the written papers’ demands; drill uncertainty work explicitly; practise linearising relationships for graph questions.
• During Papers 1 and 2: hold to about 1.3 minutes per mark from the start.
• During Paper 3: identify quickly which area of physics a question belongs to before starting.
• In every calculation: state assumptions, write the relationship in symbols, convert units in writing, keep intermediates unrounded, and check the order of magnitude.

Self-test

1. What are the three papers’ weightings, and what is distinctive about Paper 3?
2. Does the Practical Endorsement contribute marks, and where are practical skills actually examined?
3. Which uncertainty skills are examinable, and why are they described as predictable marks?
4. What is usually missing from an otherwise competent graph answer?

Answers: 1. Papers 1 and 2 are 37% each (100 marks, 2h15); Paper 3 is 26% (70 marks, 1h30) and draws on all modules (all three components include synoptic assessment), so it demands whole-course fluency under the tightest clock. 2. No – it is reported separately as Pass or Not Classified with no marks in the 270-mark total; experimental design, uncertainty, error analysis and data evaluation are examined within the written papers, all three of which include practical question styles. 3. Percentage uncertainty, combining uncertainties through a calculation, and choosing appropriate significant figures – predictable because they are mechanical once learned and recur reliably. 4. A statement of what the gradient and intercept represent physically, and the reasoning behind choosing what to plot in order to obtain a straight line.

Written against OCR’s own published “Assessment story: exploring our question papers” guide for A Level Physics A H556 (official OCR document, verified 2026-08-28). The calculation routine above is an original model written for this resource, not a reproduction of any official past paper or mark scheme. Always check the current specification for your examination year at ocr.org.uk.