OCR Gateway GCSE Physics required practicals: A complete guide

If you've been Googling "OCR Gateway Physics required practicals" and getting a mess of results, there's a reason. OCR doesn't call them required practicals at all. On the OCR Gateway Science A GCSE Physics (J249) spec they're grouped into 8 Practical Activity Groups, or PAGs, numbered PAG 1 to PAG 8. Each PAG covers a cluster of apparatus and techniques, so your school has some flexibility over which specific activity you actually do.

This guide walks through all 8 PAGs, the activity OCR gives as an example for each, how practical skills show up in the exam, and how to revise them. Whether you're sitting Foundation or Higher, the list is the same.

A couple of things to flag before you start. OCR Gateway Science A (J249) isn't the same spec as OCR Twenty First Century Science B (J259). Different papers, different structure, though the 8 PAGs and OCR's example activities are shared across both. And OCR Gateway Physics has 8 PAGs, where AQA has 10 required practicals. If you've seen a list of 10 physics practicals floating around, you've probably been looking at AQA material by mistake.

One last thing on labelling. The J249 spec PDF calls them PAG P1 to PAG P8, and OCR's shared example-set page calls them PAG 1 to PAG 8. Both mean the same groups.

OCR has grouped the Department for Education practical requirements into eight PAGs, numbered PAG 1 to PAG 8. The activity listed for each is OCR's illustration, so your school may have done something slightly different that covers the same apparatus and techniques.

For every PAG you need the method of the activity you actually did in class, the independent, dependent and control variables, the main risks, and the expected results. Here's what the OCR example activities look like in practice.

For regular solids, measure the dimensions with a ruler or vernier caliper, work out the volume, and measure mass on a balance. Density = mass / volume. For irregular solids, use a displacement can: lower the object into a full can, collect the overflow in a measuring cylinder, and the volume of water displaced is the volume of the solid. For liquids, measure the mass of an empty measuring cylinder, add a known volume of liquid, measure again, and subtract.

Exam questions often ask about the precision of the instruments (vernier calipers over rulers for small objects, measuring cylinders read at eye level), where errors creep in, and converting between g/cm³ and kg/m³.

A spring hangs from a clamp stand with a pointer and a vertical ruler next to it. Add masses in known increments and record the extension (length with the mass on, minus the original length) for each. Force comes from F = mg (with g ≈ 9.8 N/kg). A graph of force against extension gives a straight line through the origin while the spring is still obeying Hooke's law (F = kx, where k is the spring constant).

Past the limit of proportionality the line curves and the spring doesn't go back to its original length. Exam questions often ask you to spot the limit of proportionality on a graph, work out the spring constant from the gradient, or calculate the elastic potential energy stored using E = ½kx².

Set up a trolley on a ramp with light gates (or a ticker-tape timer if your school still runs it that way). Release the trolley from rest, record the time between the gates and the distance between them. Work out the acceleration using the suvat equations, typically v² = u² + 2as, or by measuring two velocities and dividing the change by time.

Change the angle of the ramp (or the resultant force, using a hanging mass over a pulley) to see how acceleration depends on force. Exam questions often ask you to spot where the errors come from (friction, air resistance) and suggest improvements (compensate for friction by lifting the ramp a tiny bit).

The OCR example uses a ripple tank, often with a strobe light to freeze the wave pattern. Measure the wavelength from the frozen image (across several wavelengths and then divide, which gives you a better number), read the frequency off the signal generator, and work out the wave speed with v = fλ.

For waves in a solid, standing waves on a stretched string are a common swap, with a vibration generator providing the driving frequency. Exam questions often ask why you measure several wavelengths at once (it reduces random error), why a strobe is used, and how to apply v = fλ to a given setup.

Weigh a block of metal (usually aluminium or copper) with holes drilled for an immersion heater and a thermometer. Switch the heater on at a measured power for a measured time, and record the temperature rise. Using Q = mcΔT (and Q = Pt, where P is power and t is time), rearrange to get c = Pt / (mΔT).

Insulation reduces heat loss and gives you a better answer. Exam questions often ask where errors come from (heat lost to the surroundings, uneven temperature across the block) and how you'd improve it (lagging, a lid, waiting for the temperature to peak after you switch off).

Build a circuit with a power supply, a variable resistor, an ammeter in series, and a voltmeter in parallel across the component you're testing (fixed resistor, then filament lamp, then diode). Vary the voltage from negative to positive, record the current, and plot I against V.

A fixed resistor gives you a straight line through the origin because it obeys Ohm's law. A filament lamp curves, because the resistance goes up as the filament heats up. A diode only conducts one way: flat along the horizontal axis in reverse bias, then a steep rise once the forward voltage is exceeded. Reading and interpreting those graphs comes up on paper reliably.

Build a circuit with two or more identical bulbs in series, then in parallel. In series, the current is the same everywhere and the supply voltage is split between the bulbs. Add more bulbs and the current drops, so each one dims. In parallel, each branch gets the full supply voltage, so the bulbs stay at full brightness, but the total current drawn from the supply is higher.

Exam questions usually hand you a mixed series-parallel circuit and ask you to work out currents and voltages at various points. The rules you need: total resistance in series just adds, and in parallel, 1/R total = 1/R1 + 1/R2.

A ray box shines a narrow beam of light at a plane mirror or a glass prism. For reflection: draw the normal where the ray hits the mirror, measure the angle of incidence and the angle of reflection, and they should be equal. For refraction: shine a ray into a rectangular glass block or a prism, draw the incoming ray, mark where it exits, trace the refracted ray, and measure both angles from the normal.

As light goes into glass it slows down and bends towards the normal; coming out, it speeds up and bends away. Exam questions typically ask you to trace rays accurately, explain which way the light bends, or predict the path for a given incident angle.

There's no separate practical exam. PAGs get tested through the two written papers at either tier: Paper 1 (Foundation) or Paper 3 (Higher) covers Topics P1 to P4 plus P9, and Paper 2 (Foundation) or Paper 4 (Higher) covers Topics P5-P8, with assumed knowledge of P1-P4 and P9. Each paper is 1 hour 45 minutes and worth 90 marks. Topic P9 "Practical skills" is its own spec topic examined on both papers, which is different from AQA, where practical skills get woven into every topic instead.

AO3 ("analyse information and ideas to interpret, evaluate, develop and improve experimental procedures") is worth 20% of marks overall, so around 18 marks per paper. AO1 and AO2 are 40% each. For the paper structure itself: Section A is 15 marks of multiple-choice, Section B is 75 marks of short-answer, data analysis and a 6-mark extended Level of Response question.

OCR Gateway Physics has a minimum 30% mathematical skills requirement across the qualification, the highest of the three sciences. Expect a lot of maths in practical contexts: density calculations, F = kx, Q = mcΔT, v = fλ, I-V graph gradients, specific heat capacity rearrangements.

The biggest difference between OCR Gateway and AQA Physics is simply the count. AQA has 10 required practicals; OCR Gateway has 8 PAGs. So if you've seen a list of 10 physics practicals somewhere, that's AQA, not OCR Gateway. The content overlap is high: both cover density, Hooke's law, acceleration, I-V characteristics, series and parallel circuits, specific heat capacity, wave speed and frequency, and reflection and refraction.

AQA also has a resistance-of-a-wire practical, a thermal insulation practical and its own infrared radiation practical, and OCR covers related techniques within its PAGs instead. AQA pins down the specific procedure within each required practical, whereas OCR lets schools pick within each PAG. OCR also has that dedicated Topic P9 "Practical skills" examined on both papers, whereas AQA weaves practical questions into every topic without a separate topic header.

Map your revision by technique, not by number. A Hooke's law method from AQA transfers directly to OCR PAG 2, but the numbering is different.

OCR runs two separate GCSE science suites. OCR Gateway Science A (physics spec code J249) is the traditional syllabus, topic-based and content-heavy. OCR Twenty First Century Science B (physics spec code J259) is context-driven, built around applied science scenarios. Different papers, different topic structures. OCR does publish one shared example set of PAG activities for both. This guide only covers J249.

If your exam entry is J249, you're on Gateway. If it's J259, you're on Twenty First Century. Check with your teacher before you start revising if you're not sure, because it's one of the easiest things to get wrong early on.

The approach is similar to Biology and Chemistry: active recall of method, variables, risks and expected results, then past-paper practice. Physics has an extra layer though, because so many of the PAGs turn into calculations, and the maths requirement is the highest of the three sciences.

For each PAG, make flashcards for four things: method as bulleted steps, variables, the main risk and how you mitigate it, and the expected result with its scientific explanation. Use the activity you actually did in class, because that's the method you'll remember most clearly, and markschemes reward specific apparatus names and approximate quantities.

Practise the calculations separately. Build yourself a short set of worked examples: density from mass and volume, extension from F = kx, acceleration from v² = u² + 2as, specific heat capacity from Q = mcΔT, wave speed from v = fλ, gradients from I-V graphs. Then work through past-paper Topic P9 questions. OCR's "suggest an improvement" and "evaluate the student's conclusion" styles come up again and again.

Cognito's OCR Gateway GCSE Physics course walks through every PAG with short video lessons, worked calculations, and exam-style questions. If you're on Combined Science, the OCR Gateway Combined Science course has the PAGs you need. For broader equation prep that pairs well with practical revision, see our guide to physics equations you need to memorise.