Edexcel A-Level Physics core practicals: A complete guide

First thing to clear up, because it causes the most stress every year: the Science Practical Endorsement does not affect your A-Level grade. It's reported separately on your certificate as a Pass or Not Classified, judged by your teachers against the Common Practical Assessment Criteria (CPAC) across the two years of the course. The grade on your certificate comes from Papers 1, 2 and 3 alone. If your Endorsement comes out as a fail, your A-Level grade is unchanged. If it comes out as a pass, your grade is also unchanged. The two are reported in parallel, not stacked.

That matters because a lot of students revise with an impression that the Endorsement is a hidden slice of the overall mark. It isn't. Universities can see it, and some engineering or physics degrees expect a pass, but the grade and the Endorsement are two separate judgements.

With that out of the way: Edexcel A-Level Physics (9PH0) has 16 core practicals spread across the two years of the course. They cover the full range of A-Level content: mechanics, materials, waves, electricity, oscillations, thermodynamics, and nuclear physics. They're assessed through written questions on Papers 1, 2 and 3 (Paper 3 especially, as the synoptic paper), and through the teacher-assessed Endorsement. This guide walks through all 16 in order, explains both teaching routes, and shows where the practical-skills marks live in the written papers.

These are the official Edexcel titles from the 9PH0 specification. Note that the specification supports two teaching routes to the same qualification: the concept-led route and the Salters Horners Advanced Physics (SHAP) context-led route. The core practicals are the same for both routes, but the teaching order may differ.

Edexcel assesses practical work in two parallel ways. The written exams carry the grade. The Endorsement is separate.

Paper 3 is the synoptic paper and the main vehicle for "indirect practical skills" questions. Edexcel's wording in the spec: Paper 3 will include questions that assess conceptual and theoretical understanding of experimental methods (indirect practical skills) that will draw on students' experiences of the core practicals.

That said, Papers 1 and 2 can also carry practical-skills questions linked to their topic content. Expect graph analysis, uncertainty calculations, and method evaluation across all three papers.

At least 40% of the marks across the three papers are awarded for mathematics at Level 2 or above, which is the highest maths weighting of any of the sciences at Edexcel A Level. Uncertainty calculations and graph work make up a sizeable share of that.

Of all the Edexcel sciences, physics puts the heaviest emphasis on quantitative uncertainty. You're expected to calculate absolute and percentage uncertainty in a single reading (for a 1 mm ruler, that's typically ±0.5 mm, so percentage uncertainty is (0.5 / measurement) × 100).

You also need to combine uncertainties: when quantities are multiplied or divided, percentage uncertainties add; when added or subtracted, absolute uncertainties add; powers scale the percentage uncertainty by the exponent. Identify the dominant uncertainty too: if one measurement has 15% uncertainty and another has 1%, the result is dominated by the first.

Finally, plot and interpret graphs with error bars, draw best-fit and worst-fit lines, and read off a gradient with its uncertainty. Students who drill this from Year 1 consistently score higher on Paper 3.

A quick clarification on nomenclature, because it trips up students who've switched boards:

Edexcel calls them core practicals. AQA calls them required practicals. OCR calls them Practical Activity Groups (PAGs). CIE doesn't publish a numbered list at all. The practicals themselves differ between boards: Edexcel's "use a falling-ball method to determine the viscosity of a liquid" isn't on AQA's required list at all, and OCR's PAGs reorganise skills across groups rather than listing experiments.

If you've moved from GCSE AQA to A-Level Edexcel, don't assume the same practicals. Start from the Edexcel list above.

For the Practical Endorsement, your teacher judges you against the Common Practical Assessment Criteria (CPAC): five strands you need to demonstrate across the two years.

A minimum of 12 practical activities is needed to support the Endorsement. Completing all 16 core practicals comfortably exceeds this. Monitoring visits by Pearson, coordinated across boards by JCQ, check that teachers' judgements are consistent with national standards.

Across the three papers (especially Paper 3), expect practical questions in a handful of recognisable formats.

Evaluating a method: identify a weakness and suggest a specific improvement. "Use a digital micrometer reading to 0.01 mm instead of a 1 mm ruler, reducing uncertainty from ±0.5 mm to ±0.005 mm" earns marks. "Use a more accurate ruler" doesn't.

Calculating uncertainty: absolute or percentage, from a set of readings or a graph, and identifying the dominant source.

Analysing a graph: reading a gradient or intercept, working out what physical quantity it represents, giving the answer with units and sensible significant figures.

Identifying variables and controls: name the independent, dependent and controlled variables, and state specifically how a control variable would be kept constant (not "keep temperature the same" but "use a thermostatically controlled water bath at 25.0 °C ±0.2 °C").

Suggesting safety precautions: specific to the experiment, linked to the hazard. For Practical 15, that means naming the specific hazard (ionising radiation) and the specific precaution (handle with tongs, maximum distance when not in use, lead-lined storage).

A few failure modes come up every year. All are preventable with past-paper practice.

False precision in tables. If you measured with a 1 mm ruler, record 24.3 cm or 243 mm, not 24.30 cm. The decimal places must match the apparatus's resolution. Lose marks here consistently and it adds up quickly.

Confusing random and systematic errors. Repeating readings improves random error, not systematic. A wrongly calibrated balance will give consistent wrong readings no matter how many times you repeat.

Vague improvements. The marker wants a named apparatus, a named improvement, and a link to the weakness. Not "use better equipment".

Missing units on calculated answers. 9.8 isn't an answer for g. 9.8 m s^–2 is. Markers are strict on this at A Level.

Ignoring the error-bar question. If the question gives data with error bars and asks for the gradient's uncertainty, you need to draw a worst-fit line and compare its gradient to your best-fit gradient. Students who skip this step get the gradient marks but miss the uncertainty marks.

You can't revise this paper by reading methods back. The practical questions test skills, and skills come from doing.

For each of the 16 core practicals, write out from memory: aim, apparatus, method in bullet form, expected results, the key graph, the typical calculation. Compare to your lab notebook or textbook. The gaps show you where to focus.

Work through past Paper 3 practical questions. Edexcel's assessment website has papers from 2017. For every question, read the examiner's report after you've answered it: that's where the specific marking criteria are described in detail, and it's the most undervalued revision resource.

Drill uncertainty calculations. Percentage uncertainty from a single reading, combined uncertainty across a calculation, dominant uncertainty identification, worst-fit gradients. These come up on nearly every Paper 3.

Practise plotting graphs by hand. Not in a spreadsheet. The exam expects a ruled best-fit line, error bars (where provided), gradient calculated from two points well-separated on the line, and units on everything.

Our A-Level Physics course on Cognito covers the full 9PH0 syllabus including worked examples of all 16 core practicals and detailed walkthroughs of Paper 3 practical-skills questions. For broader revision strategies, our A-Level revision techniques guide covers active recall and spaced practice.