IB Physics explores the fundamental laws that govern the universe, from motion and energy to waves, electricity, and modern physics. It develops students’ ability to investigate scientific problems through experimentation, data analysis, and logical reasoning, and shares its assessment structure with the other two IB science subjects.

IB Physics Syllabus Overview

The syllabus examined from 2025 is organised into five themes. SL students cover 150 teaching hours, HL students 240 — the extra time going to five Higher Level topics and to deeper treatment of several shared ones.

ASpace, time and motion

A.1Kinematics A.2Forces and momentum A.3Work, energy and power A.4Rigid body mechanicsHL A.5Galilean and special relativityHL

BThe particulate nature of matter

B.1Thermal energy transfers B.2Greenhouse effect B.3Gas laws B.4ThermodynamicsHL B.5Current and circuits

CWave behaviour

C.1Simple harmonic motionHL+ C.2Wave model C.3Wave phenomenaHL+ C.4Standing waves and resonance C.5Doppler effectHL+

DFields

D.1Gravitational fieldsHL+ D.2Electric and magnetic fieldsHL+ D.3Motion in electromagnetic fields D.4InductionHL

ENuclear and quantum physics

E.1Structure of the atomHL+ E.2Quantum physicsHL E.3Radioactive decayHL+ E.4Fission E.5Fusion and stars

HL = Higher Level only · HL+ = both levels, with additional Higher Level content · hover (or tap) a shortened topic to see its full name

Physics is especially important for students aiming for engineering, physics, mathematics, or computer science.

IB Physics Exam Structure

All IB science subjects follow a similar assessment structure combining written examinations and practical investigation.

ComponentWhat it involvesSLHLWeighting
Paper 11A — multiple-choice questions on core principles, then 1B — data-based questions on experimental data, graphs and scientific scenarios. Sat as a single session.1h 30m2h36%
Paper 2Short-answer and extended-response questions: structured problems solved through calculations, diagrams and written explanation.1h 30m2h 30m44%
Internal AssessmentA student-designed scientific investigation — data collection, analysis, and a formal scientific report. Assesses independent application of scientific methodology.CourseworkCoursework20%

Why Students Find IB Physics Difficult

IB Physics demands strong conceptual understanding and mathematical problem-solving at the same time. Students most often lose marks applying formulas to unfamiliar situations, interpreting complex diagrams and experimental data, and solving multi-step calculations under exam conditions — which is why success requires both conceptual clarity and extensive problem-solving practice.