Top 10 Fresh IB Physics IA Ideas for 2025 (With Practical Guidance)
The IB Physics Internal Assessment (IA) is a key component of the Diploma Programme, giving students the opportunity to explore physics concepts through independent investigation. A well-executed IA can significantly boost your final grade while developing valuable research, data analysis, and scientific communication skills.
In this guide, you’ll find 10 fresh IB Physics IA ideas for 2025, along with practical advice on choosing the right topic and how RevisionDojo can support you throughout the process.
Why the IB Physics IA Matters
The Physics IA accounts for 20% of your final IB Physics grade, making it too important to leave to chance. It assesses your ability to:
- Design and carry out a controlled experiment
- Collect and analyse quantitative data
- Apply physics theory appropriately
- Evaluate limitations and sources of uncertainty
- Communicate scientific reasoning clearly
Choosing a strong, manageable topic is the first step toward a high-scoring IA.
Top 10 Fresh IB Physics IA Ideas for 2025
Friction on Inclined Planes
Investigate how the coefficient of friction varies with surface material by measuring the angle at which an object begins to slide. Precision can be improved using motion sensors or video analysis.
Pendulum Length and Oscillation Period
Explore the relationship between pendulum length and oscillation period to test the model
T = 2π√(L/g).
Extend the investigation by considering amplitude or air resistance.
Solar Panel Efficiency at Different Angles
Measure the electrical output of a solar panel at different tilt angles or distances from a light source to determine the angle that maximises energy output.
Drag Force on Different Shapes
Study how drag force varies with object shape or surface area using airflow from a fan or motion through water. Analyse how drag depends on velocity.
Thermal Conductivity of Metals
Compare heat transfer through rods made of different metals. Use temperature sensors to calculate and compare thermal conductivity values.
Resistance of a Wire as a Function of Temperature
Measure how the resistance of a metal wire changes as temperature increases. Apply concepts of resistivity and temperature coefficient.
Buoyancy in Liquids of Different Densities
Investigate how buoyant force changes for an object submerged in liquids of varying densities, linking results to Archimedes’ principle.
Measuring Refractive Index Using Snell’s Law
Use a laser and protractor to measure angles of incidence and refraction and calculate the refractive indices of different transparent media.
V–I Characteristics of Non-Ohmic Devices
Examine the voltage–current relationship for non-ohmic components such as diodes or filament bulbs and analyse deviations from Ohm’s law.
Resonance in Air Columns
Measure resonance frequencies in air columns of different lengths to study standing waves and the relationship between frequency, wavelength, and speed of sound.
Tips for Choosing a High-Scoring Physics IA Topic
- Focus on continuous numerical variables to allow meaningful data analysis
- Keep the experiment simple and controllable
- Choose a topic that fits your school’s laboratory equipment
- Avoid investigations that are too broad or difficult to model mathematically
- Ensure the physics theory is clearly connected to the syllabus
A clear research question with depth is far better than an overly complex idea.
How RevisionDojo Can Support Your Physics IA
RevisionDojo provides structured support to help students succeed at every stage of the Physics IA, including:
- Refining research questions to meet IB criteria
- Structuring the IA clearly and logically
- Guidance on data processing, uncertainty, and graphing
- Checklists to avoid common examiner criticisms
Whether you are choosing a topic or polishing your final draft, RevisionDojo helps ensure your work aligns with the 2025 IB Physics assessment standards.
Frequently Asked Questions: IB Physics IA
How long should an IB Physics IA be?
The recommended length is 6–12 pages, including graphs, tables, and diagrams. Quality and clarity matter more than length.
Is originality required for a high score?
No. The IB values personal engagement and depth of analysis, not groundbreaking originality. A well-executed classic experiment can score very highly.
Can I use simulation-based experiments?
Yes, as long as the simulation allows meaningful data collection, variable control, and uncertainty discussion. However, physical experiments are often easier to justify.
What is the most common reason students lose marks?
Weak evaluation. Many students describe limitations but fail to explain how they affect results or how the investigation could realistically be improved.
Should I choose an HL-level topic if I am SL?
No. Choose a topic that matches your course level. SL investigations can score just as highly if they are analysed well.
When should I start my Physics IA?
Ideally in Year 1. Starting early gives you time to refine your method, improve data quality, and respond to feedback.
Final Thoughts
A successful IB Physics IA is built on a clear question, reliable data, and strong analysis. By choosing a focused topic and using structured support, you can turn your IA into one of your strongest components.
With consistent effort and the right guidance, a top-scoring Physics IA is absolutely achievable.
