Overview
A 7 in IB Physics is not about knowing more formulas than everyone else — the data booklet hands you the equations. It is about earning every mark on offer: choosing the right approach, showing working an examiner can follow, quoting units and significant figures, and stating direction where it is asked. Papers are marked point-by-point, so a 7 is built one method mark and one accuracy mark at a time. Here is exactly where those marks live and how to train for them.
What a 7 in IB Physics actually takes
For the IB Diploma Programme, under the 2025 syllabus, Physics is built around five themes — A Space, time and motion; B The particulate nature of matter; C Wave behaviour; D Fields; E Nuclear and quantum physics — with HL extending several of them (A.4 rigid body mechanics, A.5 special relativity, B.4 thermodynamics, D.4 induction, E.2 quantum physics). A 7 candidate is not the one who has read the most; it is the one who converts understanding into marks reliably under time pressure.
That means three things: fluent calculation across the standard question types, clean written explanations using the right physics vocabulary, and disciplined habits around units, sig figs, and direction that stop you leaking marks you have already earned. Our free IB Physics SL course and HL course map every syllabus point to a lesson so you can find and close the gaps.
The two papers and how each is marked
Understanding the marking model is half the battle. Paper 1 rewards speed and precision; Paper 2 rewards visible, logical working.
| Paper | Format | Marking | Where 7s are won |
|---|---|---|---|
| Paper 1 | Section A: multiple-choice. Section B: data-based questions | Section A scored right/wrong, no working credit; Section B on points | Fast, accurate MCQs; reading graphs, gradients and error bars in Section B |
| Paper 2 | Structured and extended-response questions | Analytic, point-by-point: method (M) and accuracy (A) marks with error-carried-forward (ECF) | Multi-step calculations, derivations, "explain" and "state" parts, correct units and sig figs |
On Paper 1 Section A there are no consolation marks — an answer is right or it is not, so accuracy and pace matter. Section B and the whole of Paper 2 are where technique pays: because marking is analytic, partial credit is everywhere, and a 7 student harvests it deliberately.
Method marks, accuracy marks and ECF
For the IB Diploma Programme, this is the single most important idea for lifting your score. Paper 2 questions are broken into method (M) marks and accuracy (A) marks. The method mark is awarded for the correct approach — selecting the right equation, rearranging it correctly, substituting the right quantities — even if your final number is wrong. The accuracy mark is for the correct value, with appropriate units and significant figures.
Error-carried-forward (ECF) means a wrong number from an earlier part does not sink the parts that follow. If you miscalculate a velocity in (a) but then use that wrong velocity correctly in (b), you still earn the method marks in (b). The catch: examiners can only apply ECF and award method marks if they can see your working. A bare final answer that happens to be wrong scores zero; the same wrong answer with a full substitution shown might score 2 out of 3.
Practical consequence: always show the equation, the substitution, then the answer. Never do algebra in your head on a "show that" or multi-mark part.
The reliable mark-earners
For the IB Diploma Programme, certain question types appear session after session. Drilling them to fluency is the highest-return revision you can do:
- Kinematics / SUVAT (Theme A): projectiles and linear motion. Split into horizontal and vertical components; keep signs consistent; state direction where required.
- Energy and work: conservation, power, efficiency. Track every energy transfer and watch unit prefixes (kJ vs J).
- Circuits (Theme D): series/parallel resistance, potential dividers, internal resistance and EMF. Draw the circuit and label currents before substituting.
- Fields (Theme D): gravitational and electric field/potential, orbital motion; HL adds electromagnetic induction. Watch inverse-square vs inverse relationships (field vs potential).
- Nuclear and quantum (Theme E): mass–energy (E = mc²), binding energy, decay, photon energy. Conversions between eV, MeV and joules are a common trap.
Graph and gradient questions run through both papers: plot data, draw a best-fit line, find a gradient, and link it to a physical quantity (e.g. gradient = spring constant). Read a gradient off the line, not two raw data points, and quote its correct unit. Uncertainties — combining absolute and percentage errors, error bars, max/min gradient lines — recur constantly and separate 6s from 7s.
Explanation and "define / state" questions
Not every mark is a calculation. Command terms tell you the response required, and mismatching them is a silent mark-killer. State and define want a concise, precise sentence — no essay, but no vagueness either. Explain wants a causal chain: not just *what* happens but *why*, linked to a physics principle. Describe wants the observable sequence.
A 7-level explanation of why a satellite in a lower orbit moves faster references the gravitational force providing the centripetal force and the resulting relationship — it does not just say "gravity is stronger." Learn the command terms cold; see IB command terms explained. Use the exact term the mark scheme wants (e.g. "the resultant force," "the induced EMF opposes the change") — near-synonyms often miss the point.
Using the data booklet like a 7 student
For the IB Diploma Programme, every candidate gets the same data booklet with equations and constants. The difference is fluency. A 7 student knows roughly *where* each equation lives and does not waste two minutes hunting mid-exam, so practise every past question with the booklet open until flipping to the right section is automatic.
But the booklet only gives you the equation — it does not tell you which one applies or how to rearrange it. That judgement is what you train through practice. Build your own one-page summary of the equations you keep reaching for, annotated with the typical use or the trap.
Common mistakes that cap you at a 5
For the IB Diploma Programme, these are the leaks that stop strong students reaching a 7 — none of them are about knowing less physics:
- Missing or wrong units. An accuracy mark often requires the unit. A number alone can lose it.
- Significant figures. Quote answers to a sensible number of sig figs (usually matching the data, typically 2–3). Over-precise or rounded-too-early answers lose accuracy marks.
- Dropping the direction. Vectors need direction. "State the nature and direction" means both are marked — a magnitude on its own is half an answer.
- Radians vs degrees. Set your calculator to the correct mode and check it. A silent degree/radian mix-up wrecks wave, oscillation and circular-motion answers.
- Rounding mid-calculation. Carry full precision through the working and round only at the end.
- No working shown. As above — this is what forfeits method marks and ECF.
A weekly LEARN → PRACTICE → GET-MARKED system
For the IB Diploma Programme, consistency beats cramming, and Paper 2 stamina depends on rest. Run a weekly loop:
- Learn — pick one or two syllabus points you are weak on. Watch/read the lesson, then write the key equations and definitions from memory. Retrieval, not rereading.
- Practice — do past-paper questions on that exact topic under gentle time pressure. Once a week, sit a full timed section to build exam pace.
- Get marked — mark against the scheme honestly, awarding M and A marks separately so you see where you lost each one. Log every recurring error (a units slip, a radian-mode slip) and drill your top three next week.
Over a term this converts vague "I sort of get it" topics into reliable marks. For paper-by-paper strategy, see the IB Physics SL past papers guide and the HL past papers guide. Don't neglect the IB Physics IA guide — the internal assessment is a criteria-marked scientific investigation and represents marks you can bank before exam season.
How MarkScheme helps
Self-marking is essential but has a ceiling: it is hard to judge your own extended answers the way an examiner would. After a past paper or an IA draft, [get an answer marked](/mark) against the criteria so you can see which method and accuracy marks you actually earned and which you left on the table. The [IB guides hub](/guides/ib) collects the rest of the subject strategy in one place.
Frequently asked questions
This section covers Frequently asked questions — what IB examiners reward most often in past papers and coursework.
Do I have to memorise the equations?
No — the data booklet provides them. What you must know is which equation applies, how to rearrange it, and where to find it quickly. Memorise usage, not the formulas themselves.
Can I get a 7 if my arithmetic is shaky?
Yes, up to a point. Because Paper 2 uses method marks and ECF, a correct approach with visible working scores even when the final number is wrong. Show every step and a slip in one part won't cascade through the rest.
How much working should I show?
On any "show that" or multi-mark part, show the equation, the substitution, and the answer. Examiners cannot award method marks or apply ECF for logic they cannot see.
What's the difference between the SL and HL exams?
HL covers the same five themes at greater depth plus extension topics (rigid body mechanics, special relativity, thermodynamics, induction, quantum physics), with longer papers. The marking model — method and accuracy marks with ECF — is the same.
How do I stop losing easy marks?
Attack the leak list: units on every answer, sensible significant figures, direction on vectors, correct calculator mode, and no mid-calculation rounding. Keep a mistake log and drill your top recurring errors weekly.