IB Physics: Syllabus, Exam Structure & Roadmap to an 7 in 2026

IB Physics ^[1] is a rigorous science course that develops students’ understanding of mechanics, waves, fields, matter, and nuclear and quantum physics through both theory and practical investigation. The course is structured around five compulsory themes, with Higher Level students exploring additional concepts in greater mathematical and conceptual depth. Students also need to understand the differences between SL and HL, the Scientific Investigation, and how Paper 1 and Paper 2 assess their knowledge and experimental skills.

With the syllabus changes introduced for exams from 2025 onward, knowing the current course structure is essential for effective study and exam preparation.

Overview of the IB Physics syllabus structure and core themes

The current IB Physics syllabus, published by the International Baccalaureate Organization (IBO), organizes all physical concepts into five compulsory themes. This is a significant structural departure from the older curriculum, which divided content into core topics and a separate bank of optional modules that students could choose from.

Under the new IB Diploma Physics guide, there are no optional modules. Topics that were previously elective, such as special relativity and engineering mechanics, are now embedded directly into the main themes. Every student, regardless of whether they take Standard Level or Higher Level, works through the same five thematic areas.

The five core themes are:

• Theme A: Space, time and motion
• Theme B: The particulate nature of matter
• Theme C: Wave behaviour
• Theme D: Fields
• Theme E: Nuclear and quantum physics

Within each theme, there is a shared core that all students cover, alongside HL-only extensions that require deeper mathematical treatment. This architecture means that a student moving from SL to HL does not encounter entirely new subject matter; instead, they engage with the same themes at a substantially higher level of rigor and complexity.

One critical detail often overlooked by students and parents when reading the IB Physics syllabus is the role of three cross-cutting skill sets, described in the official guide as “tools.” These are experimental techniques, technology use, and mathematics. These are not standalone units; they are woven throughout every theme and assessed directly in both exam papers. Students who treat these tools as secondary to content knowledge consistently underperform on data-analysis questions.

>>> Read more: IB Physics books 2026: Complete guide for students and teachers

Space, time and motion topics in the IB Physics syllabus explained

Theme A, covering space, time and motion in IB Physics, is typically the entry point for the course and sets the mathematical tone for everything that follows. At both SL and HL, students study kinematics, Newton’s laws and forces, work, energy, power, momentum, and impulse. These are the foundational mechanics concepts that underpin all subsequent themes.

For HL students, Theme A extends into two substantial areas that require dedicated preparation. The first is rigid body mechanics, which introduces rotational dynamics, torque, and angular momentum. The second is Special Relativity, covering time dilation, length contraction, and relativistic momentum. Both extensions carry significant problem-solving demands that are reflected in Paper 2 HL mark schemes.

A common mistake we see among students beginning IB Physics is underestimating kinematics. Because kinematic equations look familiar, students assume they already know this material from their earlier schooling. In practice, IB examiners expect precise vector handling, graphical interpretation, and the ability to derive results from first principles, not just apply memorized formulas.

The space, time and motion theme also introduces the data-linearization skills that appear repeatedly in Paper 1B. Students must be able to recognize non-linear relationships, transform them algebraically, and present graphical evidence. This is where mathematical tools and content knowledge intersect most visibly, and it is a primary area where exam marks are lost unnecessarily.

>>> Read more: IB Physics HL Mixed Practice Sets 2026: The Smart Way to Master Exam-Style Questions

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Wave behaviour and fields topics in the IB Physics syllabus explained

Wave behaviour (Theme C)

Theme C covers wave behaviour in IB Physics across a wide conceptual range. At SL and HL, students study simple harmonic motion, the properties of traveling waves, wave phenomena such as diffraction and interference, and the behavior of standing waves. These topics connect directly to real-world applications in acoustics, optics, and communications technology.

HL students extend their study to include single-slit diffraction analysis, multi-source interference patterns, a quantitative treatment of the Doppler effect, and resolution limits governed by the Rayleigh criterion. These extensions require both conceptual clarity and mathematical fluency, as HL Paper 2 questions on wave behaviour routinely demand multi-step derivations.

In our experience working with international students preparing for IB exams, wave behaviour is the theme where conceptual errors compound most rapidly. Students who do not fully understand the phase relationships in standing waves, for example, struggle significantly when those same principles resurface in the context of quantum wave functions in Theme E. Building a solid, connected understanding early saves substantial revision time later.

Fields (Theme D)

Theme D addresses gravitational, electric, and magnetic fields, making it one of the most mathematically dense sections of the IB Physics syllabus. At the SL and HL core level, students examine field forces on charges and current-carrying conductors, and apply Kepler’s laws to describe orbital motion. Electromagnetic induction is introduced at the foundational level within the shared core content.

HL extensions for fields go considerably further. Students are required to work with gravitational and electric potential energy in quantitative terms, calculate escape speeds from gravitational potential wells, analyze magnetic induction using Faraday’s and Lenz’s laws, and handle alternating current circuits including RLC behavior and resonance. This is the HL extension set that most clearly separates IB Physics from many national science curricula.

One critical detail often overlooked is that fields questions in IB exams rarely test a single concept in isolation. A typical HL Paper 2 question might begin with orbital mechanics, transition into electric field analysis, and conclude with an energy calculation. Students who revise themes as isolated blocks rather than interconnected frameworks are frequently caught off guard by this synthesis demand.

>>> Read more: IB Physics HL Explain Questions : PEE Method for Long Answer Marks

Nuclear and quantum physics topics in the IB Physics syllabus explained

Theme E, covering nuclear and quantum physics in IB Physics, is widely regarded as the most conceptually challenging section of the course. At SL and HL, students study atomic structure, radioactive decay (including decay equations and half-life calculations), nuclear fission and fusion, and the quantized energy levels of atoms and molecules.

HL students take this substantially further. The HL extension for Theme E includes quantum physics concepts such as the photoelectric effect, Compton scattering, de Broglie wavelengths, wave functions, probability density, and the Heisenberg uncertainty principle. Additionally, HL students cover stellar evolution and the physics of stars, connecting nuclear processes to astrophysical phenomena.

Drawing on years of experience at Times Edu, we consistently observe that students underestimate the conceptual leap required for HL quantum physics. The mathematics involved is not always more difficult than other HL extensions, but the interpretive demands are higher. Understanding what a wave function physically represents, or why the uncertainty principle is not a measurement limitation but a fundamental property of nature, requires a different kind of intellectual engagement than solving a rotational dynamics problem.

Parents reviewing the IB Physics syllabus with their children should be aware that Theme E is typically taught later in the two-year program, meaning students have less revision time for it before mock exams. Building a study timeline that front-loads quantum content review is a strategic decision that consistently pays off in final exam performance.

How IB Physics SL and HL syllabuses differ from each other

The IB Physics SL and HL differences go beyond the obvious distinction of taught hours. Understanding the precise nature of these differences helps students and families make a more informed level choice.

A common mistake we see is students choosing HL Physics primarily because they performed well in their previous school’s science classes, without accounting for the shift in mathematical expectations. IB HL Physics requires genuine comfort with calculus-adjacent reasoning, vector algebra, and multi-variable problem solving. Students who struggle in HL Mathematics or Mathematics: Analysis and Approaches are likely to find HL Physics disproportionately demanding.

The scientific investigation component carries 20% of the final grade at both levels. This is an individual practical report of up to 3,000 words and is internally assessed by teachers, then externally moderated by the IBO. Students frequently underinvest in this component during the research and drafting phase, treating it as secondary to exam preparation. In practice, a well-executed investigation can be the most reliable source of top marks in the course.

Recent changes to the IB Physics syllabus and what they mean for students

The new IB Physics syllabus, introduced for first examination in 2025, represents the most significant restructuring of the course in over a decade. Students and teachers working from older resources are at risk of preparing for content that is no longer assessed, or missing content that is now compulsory.

The key structural changes are as follows:

• The optional topics system (previously allowing choice between areas like astrophysics, relativity, and medical physics) has been eliminated entirely.
• Special Relativity, previously an option, is now a compulsory HL extension within Theme A.
• Thermodynamic content, including entropy and heat engine efficiency, has been elevated to a required HL extension within Theme B.
• The number of final exam papers has been reduced from three to two, with experimental skills now integrated into Paper 1B rather than assessed in a separate paper.
• The Scientific Investigation replaces the previous Internal Assessment format, with updated evaluation criteria.

For students who downloaded an IB Physics syllabus guide prior to 2023, that document reflects the old curriculum structure and should not be used for current exam preparation. The official IBO Physics guide for the new syllabus is available through the IBO’s programme resource centre and through registered IB schools. Students who want to download the IB Physics syllabus document should do so directly through their school’s IBO portal to ensure they access the most current version.

One development worth noting is that the new syllabus places explicit emphasis on the nature of science and the role of experimental skills throughout all five themes. This is not merely philosophical framing; examiners have signaled that Paper 1B data-analysis questions will test students’ ability to design experiments, identify sources of uncertainty, and critically evaluate methodologies. Treating this as a “soft” skill area is a significant strategic error.

Frequently asked questions

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