The most-tested AQA GCSE Physics topics — what to prioritise

The AQA GCSE Physics specification has eight named topics across two papers. They aren't equal weight. A handful of topics appear in almost every paper, account for a disproportionate share of the marks, and reward focused practice more than any other. If you've got limited revision time — most students do — these are the topics to drill first.

This isn't a guess. It's drawn from a long look at the last five years of AQA Triple Physics papers. The same five topic areas show up year after year. Knowing them confidently is roughly the difference between a grade 6 and a grade 8.

A note on "most tested": we're counting topic areas that appear across multiple questions on every paper, often woven into other topics. Forces calculations turn up in an electricity question about a motor; the wave equation shows up in a magnetism question about EM waves. That's where marks pile up.

1. Forces — calculations, Newton's laws, momentum

If we had to pick one topic that every Physics student has to nail, it's Forces. It dominates Paper 2, contributes a substantial chunk to Paper 1's energy work, and underpins almost every problem-solving question.

Typical mark allocation: 25–35 marks across the two papers — roughly 15% of all available marks.

Key equations:

• F = ma (force = mass × acceleration) — memorise this; not on the equation sheet
• W = mg (weight = mass × gravitational field strength)
• p = mv (momentum)
• F = m∆v/∆t (force = rate of change of momentum) — on the equation sheet
• Work done = force × distance

Common mistakes:

• Confusing mass and weight. Mass is in kg, weight is in newtons. "Weight = 70 kg" is automatically wrong — that's mass.
• Forgetting that F = ma gives the resultant force. A 5N driving force minus 2N friction gives 3N resultant, not 5N.
• Newton's third law misstatements. "Every action has an equal and opposite reaction" is a folk version; AQA wants "if A exerts a force on B, B exerts an equal and opposite force on A." Specificity matters.
• Momentum questions where students forget to subtract the initial momentum. Change in momentum is final − initial, not just final.

Study tip: drill the 6-mark "stopping distance" questions — they reliably combine reaction time, braking distance, and an energy-transfer explanation. They're predictable, they reward structured working, and they appear most years.

2. Electricity — circuits, V = IR, power

Electricity sits inside Paper 1 and is the most consistently tested calculation-heavy topic. It also has the highest density of "show your working" marks anywhere on the syllabus — students who write out the equation, sub in values, and box the final answer pick up 1–2 method marks even when they get the arithmetic wrong.

Typical mark allocation: 20–25 marks per Paper 1, plus a few crossover marks where electricity meets magnetism on Paper 2.

Key equations:

• V = IR (Ohm's law)
• P = VI (power = voltage × current)
• P = I²R (alternative power form)
• E = Pt (energy transferred = power × time)
• Q = It (charge = current × time)

Common mistakes:

• Treating series and parallel circuits as if they're the same. In series, current is the same everywhere and voltage splits. In parallel, voltage is the same across each branch and current splits. Mixing these up costs whole questions.
• Misreading circuit diagrams. The position of the ammeter (in series with the component) vs the voltmeter (in parallel) is exam-critical and students draw them the wrong way round under pressure.
• Unit confusion. Power is in watts (W), energy in joules (J). "Energy transferred = 5 watts" is automatically wrong.
• Forgetting that resistance of a filament lamp increases with temperature, so the I-V graph is curved, not straight. This is a Required Practical and an exam favourite.

Study tip: get good at reading the I-V characteristic graphs for resistor, filament lamp and diode. These three shapes turn up almost every year. The diode is one-direction-only (current only flows when voltage is positive in the forward direction).

3. Waves — wave equation, EM spectrum

Waves sits in Paper 2 and includes the wave equation, the electromagnetic spectrum, and reflection/refraction at boundaries. It's a calculation topic dressed up as a "describe what happens" topic.

Typical mark allocation: 15–20 marks across Paper 2.

Key equations:

• v = fλ (wave speed = frequency × wavelength)
• T = 1/f (period and frequency)

Common mistakes:

• Confusing transverse and longitudinal waves. Transverse: oscillation perpendicular to direction of energy transfer (light, water surface, ripples on a string). Longitudinal: oscillation parallel (sound, P-waves). Students sometimes describe sound as transverse — half marks at best.
• Getting the EM spectrum order wrong. Memorise it: Radio, Microwaves, Infrared, Visible, Ultraviolet, X-rays, Gamma. Frequency increases left to right; wavelength decreases left to right; energy increases left to right.
• Refraction direction mistakes. Light entering a denser medium (e.g. glass) bends towards the normal. Going back out, it bends away from the normal. Drawing the wrong direction loses the diagram mark.

Study tip: practise the "describe one use and one danger of each EM region" question. It's recyclable — UV: tanning / skin cancer; gamma: sterilising / mutation; microwaves: cooking / heating tissue. These are 4–6 mark gifts if you have them memorised.

4. Energy — KE, GPE, specific heat capacity, efficiency

Energy underpins Paper 1 and shows up indirectly in Paper 2. It's the topic where equation memorisation pays off most directly — the questions are usually plug-and-chug if you know the formula, and lost marks tend to be silly arithmetic errors not concept errors.

Typical mark allocation: 18–24 marks across Paper 1, plus crossover.

Key equations (all to memorise — none on the equation sheet):

• KE = ½mv² (kinetic energy)
• GPE = mgh (gravitational potential energy)
• E = mc∆θ (specific heat capacity)
• Efficiency = (useful energy out) / (total energy in) — sometimes as %, sometimes as decimal
• Power = energy / time

Common mistakes:

• Forgetting the ½ on kinetic energy. KE = mv² is one of the most expensive single errors in the whole paper because it doubles every answer.
• Squaring only the velocity, not multiplying by the half. KE = ½ × 2 × 10² should be ½ × 2 × 100 = 100J, not 2 × 100 / 2 = 100J via some confused route. The order matters when you're working under pressure.
• E = mc∆θ with the wrong units. Specific heat capacity c has unusual units (J/kg°C). Get the units right and the answer follows.
• Efficiency over 100%. If you calculate 1.4 (or 140%), you've made an error somewhere — efficiency can't exceed 1 (or 100%). Check the question setup.

Study tip: master the "energy transferred to a kettle" type calculation. Power × time gives energy in joules. Then E = mc∆θ gives the temperature rise. These two-step questions are formulaic once you've done five.

5. Required Practicals — always 1 question worth 5–6 marks

This isn't a single topic — it's a category. AQA puts at least one Required Practical question on each of Papers 1 and 2, typically worth 5–6 marks. That's 10–12 marks across the two papers for material that's completely predictable in advance.

The 10 named practicals are split: 5 typically appear on Paper 1 (specific heat capacity, density, resistance vs length, I-V characteristics, insulation), and 5 on Paper 2 (springs, acceleration, waves on a string, refraction, radiation surfaces). We've published a full required-practicals cheatsheet covering each one.

Common mistakes across all practicals:

• Confusing the independent variable (the one you change) with the dependent variable (the one you measure). Always state both explicitly.
• Forgetting to state the control variables — the ones held constant. Almost every required-practical question awards a mark for naming a control.
• Vague accuracy improvements. "Use a better thermometer" is rejected; "use a digital thermometer to 0.1°C" is awarded.

Study tip: write a one-page summary for each of the 10 practicals — IV, DV, controls, equipment, typical errors, typical improvements. Take 10 hours to do all 10. You'll bank 10+ exam marks for almost no risk.

What "drilling these five" actually looks like

A practical priority list, given limited time:

1. Forces — biggest single topic by marks, equation-heavy, problem-solving-rich. Non-negotiable.
2. Required Practicals — best ROI per hour of revision. The marks are predictable.
3. Electricity — high-frequency, equation-heavy, method-mark-rich.
4. Energy — clean equation work, predictable question shapes.
5. Waves — fewest marks of the five, but recyclable answers (EM spectrum uses/dangers).

A reasonable plan is two evenings per topic, plus practical write-ups and equation drill running in parallel. Two weeks gets you through all five properly.

Where our tools fit

The Adaptive Maths subscription at £30/month surfaces a daily 10-question pack weighted toward your child's weakest topics — we're rolling the equivalent Physics product out next. The free 10-question topic probe on every topic page is a good way to spot-check whether any of these five are genuinely solid or just feel solid.

The honest bottom line: if these five are confident — Forces, Electricity, Waves, Energy, Required Practicals — the difference between a grade 6 and a grade 8 on AQA Physics is small. If even one is shaky, the ceiling is hard to break through.