Physics 0625 · Cambridge O Level / IGCSE
Paper 3: Theory (Core)
1 hour 15 minutes · 80 marks · 50%
- Duration
- 1 hour 15 minutes
- Marks
- 80
- Tier
- Core
- Practice here
- 84
What is on this paper
- Short-answer and structured questions
- Externally assessed
How it is weighted
- 50%
Which papers you sit
All candidates take three components.
Core candidates take Paper 1, Paper 3 and either Paper 5 or Paper 6, and are eligible for grades C to G.
Extended candidates take Paper 2, Paper 4 and either Paper 5 or Paper 6, and are eligible for grades A* to G.
Assessment details are taken from the official Cambridge Physics 0625 syllabus for 2026-2028. Read the syllabus ↗
Practise the topics on Paper 3
All Physics topics →84 original questions, each with a full worked solution. Free to read, no account needed.
Motion and Motion Graphs
Define speed, velocity and acceleration; use v = s/t and a = Δv/Δt; plot and interpret distance–time and speed–time…
Forces and Newton’s Laws
Identify the effects of forces on motion and shape; find resultant forces; apply F = ma; use load–extension graphs and…
Energy, Work and Power
Track energy stores and transfers; apply the principle of conservation of energy; use KE = ½mv², ΔEp = mgΔh, W = Fd…
Electric Circuits and Resistance
Draw and interpret circuit diagrams; use I = Q/t, V = W/Q and R = V/I; combine resistors in series and parallel…
General Wave Properties
Describe waves as energy transfer without matter transfer; define wavelength, frequency, amplitude and wavefront; use…
Thermal Energy Transfer
Describe and explain conduction, convection and radiation, including experiments demonstrating each; compare good and…
Density
Use ρ = m/V; describe experiments to find the density of liquids, regular solids and irregular solids (displacement…
Moments, Equilibrium and Centre of Gravity
Calculate the moment of a force as force × perpendicular distance; apply the principle of moments to balanced beams…
Reflection, Refraction and Lenses
Construct ray diagrams for plane-mirror images and for thin converging lenses; use the law of reflection; apply n =…
Kinetic Particle Model of Matter
Explain the properties of solids, liquids and gases using particle arrangement and motion; relate temperature to…
The Electromagnetic Spectrum
Order the regions of the electromagnetic spectrum by wavelength/frequency; recall that all EM waves travel at 3.0 ×…
Pressure
Use p = F/A and explain everyday pressure effects; calculate the pressure change with depth in a liquid using Δp = ρgΔh.
Electromagnetic Effects
Describe electromagnetic induction and the factors affecting induced e.m.f.; explain the magnetic effect of a current…
Radioactivity and the Nucleus
Use nuclide notation and describe the nucleus in terms of protons and neutrons; compare α, β and γ emission in nature…
Space Physics
Explain day/night, the seasons and the Moon’s phases from the Earth’s rotation and orbits; describe the structure of…