AQA paper 1: mechanics, materials, electricity, waves, particles and periodic motion · A-Level Physics · Courselo

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AQA paper 1: mechanics, materials, electricity, waves, particles and periodic motion

6 min readA-Level Physics

Paper 1 is 2 hours, 85 marks and 34% of the A-level. It covers specification sections 1–5 and 6.1: measurements and errors, particles and radiation, waves, mechanics and materials, electricity, and periodic motion (circular motion, simple harmonic motion, damping and resonance). It is mostly Year 12 content, and that’s the danger. Candidates treat it as the “easy” paper, revise it least in the final term and drop the marks that decide the A*. The target is 68/85 (80%). The notional A* in June 2026 was 64.

The structure

Section	Marks	Content	Time
A	60	6–8 multi-part structured questions: definitions, calculations, graphs, explanations and at least one 6-mark extended response	About 85 min
B	25	25 multiple-choice questions, 1 mark each, options A–D	About 30 min
—	—	Flick-through at the start, checking at the end	About 5 min

Section A questions usually open with a recall mark (a definition, a unit, a label) and build to a multi-step or synoptic final part. Every topic area appears somewhere on the paper, either in Section A or among the MCQs.

What comes up, and what earns the marks

Area	Recurring questions	What earns the marks
Measurements (1)	Base units of a derived quantity; combining uncertainties	Units reduced to kg, m, s, A, K, mol; percentage uncertainties added, and multiplied by the power
Particles and radiation (2)	Classifying particles; conservation checks; Feynman diagrams for β⁻, β⁺ and electron capture; specific charge	Charge, baryon number, lepton number and strangeness tallied before and after; strangeness conserved only in strong interactions; the right W boson
Quantum phenomena (2)	Photoelectric effect; energy levels and line spectra; de Broglie wavelength	eV converted to J; one photon interacts with one electron; the threshold frequency explained through the work function
Waves (3)	Stationary waves; Young’s slits, $w = \frac{\lambda D}{s}$ ; gratings, $d\sin\theta = n\lambda$ ; optical fibres
Mechanics (4)	Projectiles; moments; momentum and impulse; work, energy and power; terminal velocity	Horizontal and vertical motion treated separately; impulse as the area under a force–time graph; the pivot chosen to remove an unknown force
Materials (4)	Young modulus; stress–strain and force–extension graphs	Energy stored as the area under a force–extension graph; Young modulus from the gradient of the linear region only
Electricity (5)	Potential dividers with a thermistor or LDR; emf and internal resistance; I–V characteristics; resistivity; superconductivity	A reasoned chain for sensor circuits; $\varepsilon = I(R + r)$ and “lost volts”; critical temperature
Periodic motion (6.1)	Circular motion; SHM graphs and energy; damping and resonance	$a = -\omega^2 x$ as the defining condition; the phase links between $x$ , $v$ and $a$ ; resonance when the driving frequency equals the natural frequency

Required practicals 1–7 (stationary waves on a string, interference and diffraction, $g$ by free fall, Young modulus, resistivity, internal resistance, and SHM) can appear in Section A as well as in Paper 3.

Timing plan

Elapsed	Target
0–2 min	Flick through. Find the 6-mark question and any graph
45 min	About 30 of the 60 Section A marks attempted
87 min	Section A finished
102 min	About 13 MCQs done
117 min	All 25 MCQs done. Use the last 3 minutes on flagged items

That is about 1.4 minutes per mark in Section A and 70 seconds per MCQ. A 6-mark answer should take 8–9 minutes: 2 to plan, 6–7 to write.

Section A technique

The marks tell you the steps. A 3-mark calculation is usually an equation, a substitution and an answer. A 2-mark explanation needs two linked points.
Obey the command word. State needs no reason. Explain needs a mechanism. Show that needs every step and one extra significant figure.
Draw when a diagram helps, and draw on the given diagram when asked. Resultant-force arrows, ray paths at a boundary and Feynman diagrams all earn marks directly.
For sensor circuits, write a chain. Temperature rises, so the thermistor’s resistance falls, so its share of the supply pd falls, so the output across the fixed resistor rises. Missing a link loses a mark.

Planning a 6-mark answer

Explain how a stationary wave forms on a stretched string fixed at both ends, and why it can exist only at certain frequencies.

Strand 1, formation: a wave travels along the string and reflects at the fixed end. The incident and reflected waves have the same frequency and similar amplitude and travel in opposite directions, so they superpose.

Strand 2, nodes and antinodes: where the two waves are always in antiphase they cancel, giving nodes of zero amplitude. Where they are in phase they reinforce, giving antinodes of maximum amplitude. Nodes are half a wavelength apart.

Strand 3, allowed frequencies: each fixed end must be a node, so a whole number of half-wavelengths must fit the length: $L = \frac{n\lambda}{2}$ . With and , only gives a stationary wave. The first harmonic is .

Section B technique

Work in ratios. A wire of the same material with twice the length and half the diameter has $R \propto \frac{L}{d^2}$ , so its resistance is $2 \times 2^2 = 8$ times larger. There’s no need to calculate an area.

Scale factors are worth knowing by heart. Quadrupling the mass on a spring doubles the period. Doubling the tension on a string raises its frequency by a factor of $\sqrt{2}$ . Doubling the distance from the slits doubles the fringe spacing.

Common mistakes

Quick recap

85 marks in 120 minutes: about 85 minutes for Section A, 30 for the 25 MCQs and 5 to spare.
Target 68/85. The notional A* in June 2026 was 64.
Section A: marks show the steps, the command word sets the depth, and every link in a sensor chain earns credit.
6-mark answers: plan three strands, then write each one with a reason.
MCQs: ratios, units, limiting cases and a quick sketch before any long calculation.