GCSE Physics Required Practicals Guide: All 10 Explained Simply

If you've started revising GCSE Physics, you've probably noticed that a chunk of exam marks don't come from remembering facts — they come from questions about experiments you did in the lab, sometimes over a year ago. These are drawn from your GCSE Physics required practicals, and they trip up more students than almost anything else on the paper, not because the physics is hard, but because the memory of the practical has faded.

This guide walks through every required practical in a clear, plain-English way: what you're actually doing, what the exam tends to ask, and where students typically lose marks. Whether you're on AQA, Edexcel, or OCR, the core ideas are almost identical — only small details in apparatus and naming differ, and we'll flag those where it matters.

A quick note on IGCSE: Cambridge and Edexcel International IGCSE Physics don't use the exact term "required practicals" the way UK GCSE boards do — practical skills are assessed more generally through the theory paper (and, for some boards, an Alternative to Practical paper). Everything in this guide about understanding the experiments and how they're examined still applies directly to IGCSE Physics students, since the underlying experiments — measuring resistance, investigating springs, determining density, and so on — are the same core practicals.

What Is a Required Practical, and Why Does It Matter for Your Grade?

A required practical is a specific, government-specified experiment that every GCSE Physics student in England must carry out during the course. You won't be examined on doing the practical itself in most cases — instead, questions in your written exams will ask about it: describing the method, identifying variables, analysing results, spotting errors, or suggesting improvements.

Many educators observe that students often revise the physics content thoroughly but skip revising the practicals separately, treating them as something they "already did" rather than something they need to actively recall. That's usually where marks are lost — not from not understanding the science, but from not being able to describe the process precisely enough to satisfy the mark scheme.

Required practical questions typically make up 15% or more of total GCSE Physics marks across most exam boards, which is a significant, winnable chunk if you prepare properly.

How Many Required Practicals Are There? (AQA vs Edexcel vs OCR)

The exact numbering differs slightly, but the underlying experiments overlap heavily across boards. Below is the core set that appears, in some form, on every specification.

The Core GCSE Physics Required Practicals, Explained

1. Investigating Density

You measure the mass and volume of regular and irregular solids (using a displacement method for irregular shapes) and liquids, then calculate density using density = mass ÷ volume.

Common exam trap: students forget to explain why displacement is used for irregular objects (because you can't measure length × width × height when the shape is irregular), and lose marks on measuring liquid volume accurately using a meniscus.

2. Resistance of a Wire

You set up a circuit with a wire, ammeter, voltmeter, and variable resistor, then measure current and potential difference at different wire lengths to calculate resistance and see how it changes.

Common exam trap: mixing up which meter goes in series (ammeter) and which goes in parallel (voltmeter), and forgetting that a longer wire means more resistance.

3. I–V Characteristics of Components

You investigate how current changes with potential difference for a resistor, a filament lamp, and a diode, and sketch the characteristic graphs for each.

Common exam trap: not being able to explain why the filament lamp's graph curves (because it heats up and resistance increases), which is a very common written-answer question.

4. Specific Heat Capacity

You heat a known mass of a material, measure the energy supplied (using a joulemeter or current/voltage/time) and the temperature change, to calculate specific heat capacity.

Common exam trap: forgetting to account for heat loss to the surroundings, and not being able to suggest insulation as an improvement.

5. Specific Latent Heat

Similar setup to specific heat capacity, but you measure the energy needed to change the state of a substance (e.g., melting ice) without a temperature change.

Common exam trap: confusing latent heat of fusion (melting) with latent heat of vaporisation (boiling) — these are different values and different processes.

6. Investigating Springs (Force and Extension)

You add masses to a spring, measure extension, and plot force against extension to find the spring constant and identify the limit of proportionality.

Common exam trap: not knowing what "limit of proportionality" means on the graph — it's the point where the line stops being straight.

7. Waves in a Ripple Tank / on a String

You measure wave speed, frequency, and wavelength using a ripple tank (water waves) or a vibration generator with a string, and verify wave speed = frequency × wavelength.

Common exam trap: mixing up how to measure wavelength accurately (measuring across several waves and dividing, rather than just one, to reduce error).

8. Radiation and Absorption (Infrared)

You use a Leslie cube with different surfaces (matte black, white, shiny) and an infrared detector to compare how much radiation different surfaces emit or absorb.

Common exam trap: forgetting that matte black surfaces are the best absorbers and emitters, while shiny/silver surfaces are the worst — a frequently tested fact.

9. Acceleration (Motion Investigation)

You investigate the motion of a trolley or ball down a ramp using light gates or a ticker timer, calculating acceleration from changing velocity over time.

Common exam trap: not being able to explain how to reduce friction or how light gates improve accuracy over stopwatch timing.

10. Force and Extension / Newton's Second Law (Combined Practical)

Some boards combine investigating the relationship between force, mass, and acceleration using a trolley, pulley, and masses — testing F = ma.

Common exam trap: forgetting to keep total mass of the system constant when varying force, which is a classic "control variable" question.

How Examiners Actually Ask About Required Practicals

This is the part students underestimate. Examiners rarely just ask "describe this experiment." Instead, they test understanding of the method, using command words like:

• "Identify the independent/dependent/control variable" — you must know the difference between what you change, what you measure, and what you keep the same.
• "Explain why a repeat reading was taken" — the answer is almost always to identify anomalies and calculate a more reliable mean.
• "Suggest one improvement to this method" — common answers involve better measuring equipment (e.g., using a data logger instead of a stopwatch) or repeating more times.
• "Calculate the gradient of the graph and explain what it represents" — this is a maths-and-physics hybrid question, common in the springs and resistance practicals.
• "Explain a source of error in this experiment" — distinguishing between random error (small unavoidable variation) and systematic error (a consistent bias, like a badly calibrated instrument).

Many educators observe that students who score highly on these questions are the ones who can explain the purpose of each step, not just recite what happened. A tutor or revision partner asking "why did you do that step?" repeatedly is one of the most effective ways to build this skill.

Expert Insight: Why Required Practicals Feel Harder Than They Should

Case Study

The Gurukul 4-Step Required Practicals Revision Method

A simple, repeatable framework for reviewing all ten (or eight) practicals efficiently:

1. Recall the purpose — what relationship or value was the practical trying to find?
2. Recall the method in 5 steps — force yourself to write it from memory before checking notes.
3. Identify the three variables — independent, dependent, and at least two control variables.
4. List one error and one improvement — this single habit covers a huge share of exam marks.

Repeating this four-step cycle across all required practicals, a few at a time, builds exactly the kind of flexible understanding examiners reward — rather than rigid memorisation that falls apart under an unfamiliar question angle.

Frequently Asked Questions

Conclusion

GCSE Physics required practicals aren't really about remembering a specific afternoon in the school lab — they're about a small set of transferable skills: identifying variables, spotting errors, reading graphs, and suggesting improvements, applied across ten different contexts. Once a student sees the pattern rather than treating each practical as a separate memory task, the marks that used to feel unpredictable become some of the most reliably scorable on the entire paper. Working through past questions by skill type, rather than by practical, is the fastest way to turn this from a weak spot into a strength.