NCEA Level 3 Physics: waves, mechanics and electricity externals

NCEA Level 3 Physics standards

That is 16 external credits and up to 13 internal credits, depending on which internals your school offers. NZQA's past exams, assessment schedules and examiner reports are on its Physics past exams page.

The NCEA Level 3 Physics exam

NZQA's 2027 assessment specifications say the exam is on printed paper and that you should show your reasoning clearly, with working, words or diagrams. Gravity is given as 9.81 m s⁻², significant figures should match the data, and NZQA recommends standard form and rounding only at the end. Excellence answers typically show mathematically how two ideas are connected.

What each external covers

Mechanical systems (91524)

Centre of mass; momentum and impulse in two dimensions; circular motion and gravity; rotating systems, including constant angular acceleration, torque, rotational inertia and conservation of angular momentum; and oscillating systems, including simple harmonic motion, reference circles, damped and driven systems and resonance. This is the mechanics standard and the biggest at 6 credits.

Electrical systems (91526)

DC circuits with resistors; capacitors, including capacitance, dielectrics, series and parallel, charging graphs, time constant and energy stored; inductors, including self-inductance, time constant, energy stored and the transformer; and AC circuits, including peak and rms values, phase in LR and CR circuits, phasor diagrams, reactance and impedance.

Wave systems (91523)

Quantitative interference of light and sound, including multi-slit interference and diffraction gratings; standing waves in strings and pipes; harmonics; resonance; beats; and the Doppler effect for a stationary observer.

Worked examples

Mechanical systems: simple harmonic motion

A 0.10 kg mass oscillates on a spring with spring constant 40 N m⁻¹ and amplitude 0.050 m. Find its angular frequency, period and maximum speed.

The maximum speed is v = Aω = 0.050 × 20 = 1.0 m s⁻¹, reached at the centre of the motion.

Electrical systems: a capacitor charging

A 100 μF capacitor charges through a 10 kΩ resistor from a 12 V supply. The time constant is τ = RC = 10,000 × 0.000100 = 1.0 s. After one time constant the capacitor reaches about 63% of the supply voltage: 12 × (1 − e⁻¹) = 7.6 V.

Wave systems: a diffraction grating

Light of wavelength 600 nm shines on a grating with 500 lines per millimetre. The slit spacing is d = 1 mm ÷ 500 = 2.0 × 10⁻⁶ m, so the first-order maximum is at:

Try an impulse question from our Laws of Motion course, then press Mark to check it in the course:

Grades, credits and endorsements

Every NCEA standard is graded Not Achieved, Achieved, Merit or Excellence, and earns its credits at whatever grade you reach. Achieved shows you meet the standard, Merit shows deeper understanding, and Excellence shows it applied to harder, unfamiliar problems.

• The certificate: NCEA Level 3 needs 60 credits at Level 3 or above, plus the 20-credit literacy and numeracy co-requisite, which you can gain any time before you leave school. Since 2024 you can no longer carry 20 credits over from the level below.
• Certificate endorsement: 50 credits at Merit or better gives a Merit endorsement; 50 at Excellence gives an Excellence endorsement.
• Course endorsement: 14 or more credits at Merit or Excellence in one subject in one year, with at least 3 from internal and 3 from external standards in most subjects.

Use the daily paper as a practice exam

Uni-Sine publishes a free daily paper on the NCEA Level 3 Physics track. It is a short timed paper: 8 questions worth 25 to 35 marks, marked instantly, with worked answers. It is not a full NCEA exam and it is not written by NZQA, so treat it as a quick daily practice test alongside NZQA's past papers.

• What it covers well: circular motion and gravitational orbits, simple harmonic motion, capacitors, electromagnetic induction and magnetic forces, which support much of 91524 and 91526.
• What it does not cover: wave systems (91523), rotational motion, two-dimensional momentum, AC circuits, and the internals. It also includes thermal physics, electric fields and nuclear energy, which are not NCEA Level 3 externals.

A good routine is one daily paper under timed conditions, then a careful look at every mark you dropped, then one NZQA past paper a week in the weeks before the exam.

The Physics: Mechanics daily paper

There is a second daily paper for the mechanics side, on the NCEA Level 3 Physics: Mechanics track, with the same format of 8 questions and 25 to 35 marks. It covers constant acceleration, forces and Newton's laws, projectiles, slopes, connected particles, friction, moments and variable acceleration with calculus. That is mostly Level 2 mechanics taken further with algebra and calculus, so it builds the problem-solving behind 91524, and moments lead into torque. It does not cover circular motion, rotation or simple harmonic motion, so use the main Level 3 Physics paper and NZQA past exams for those.

NCEA changes for 2026, 2027 and beyond

NCEA still applies in 2026 and 2027, so the standards on this page are the ones you will sit. New Level 3 standards are due to be fully in place by 2029, and in 2030 a new New Zealand Advanced Certificate of Education (NZACE) replaces NCEA Level 3 for Year 13. The Government agreed the structure of the new qualification system on 26 March 2026, and the Ministry of Education confirmed further details and the timeline on 16 May 2026.

Common mistakes in NCEA Level 3 Physics

• Giving a formula without a reason. Excellence needs the physics connected step by step, in words as well as maths.
• Rounding early. Keep unrounded values until the final answer, as NZQA recommends.
• Confusing peak and rms. For a sine wave, V_rms = V_peak ÷ √2.
• Forgetting direction in 2D momentum. Resolve into components or draw a vector diagram.

Read next

New Zealand · NCEA Level 3NCEA Level 3 Chemistry: standards, exam date and practiceNCEA Level 3 Chemistry explained: thermochemistry, organic and aqueous equilibrium externals, the internals, the 2026 exam date and worked examples.