How do I choose an IB Physics IA topic that’s “easy” but still scores well?

An “easy” IB Physics IA topic scores well when it becomes a precise question, not when it becomes a complicated setup. Projectile motion, V-I characteristics, and refraction can all earn strong marks because they allow clear graphs, uncertainty treatment, and a direct link to theory. The real differentiator is how you justify controls and evaluate limitations, not how impressive the equipment looks. Pick a topic where you can run many trials and measure carefully, because a rich data set gives you options. Then connect your explanation to syllabus language using RevisionDojo Study Notes so it reads like physics, not just procedure. Finally, use RevisionDojo’s AI Chat to challenge your assumptions before you collect data, because it’s cheaper to fix a method on paper than in the lab.

What makes an IB Physics IA research question strong?

A strong IB research question has one independent variable you can change in consistent steps and one dependent variable that responds in a measurable way. It also signals a physics model you can test, such as a proportional relationship, an inverse relationship, or an exponential decay. Good questions avoid words like “affect” without specifying what is measured and how. They also include context and constraints: material type, length range, temperature range, and measurement method. If your question cannot produce a graph that teaches you something, it will feel thin later during analysis. Before committing, try one or two Questionbank problems on the same topic to confirm you actually understand the underlying model.

How much data do I need for an IB Physics IA?

Most IB Physics IA investigations become easier to write when you collect enough data to show a pattern and enough repeats to show reliability. As a rule, aim for at least 5-8 levels of your independent variable, and repeat each level multiple times so you can compute means and uncertainties. More data is not automatically better if it is noisy, but too little data forces you into weak conclusions. You also want data that supports uncertainty propagation, gradient calculation, or model comparison. Planning this ahead of time helps you avoid the “Trial 7 (panic)” situation where you scramble for numbers at the end. Use RevisionDojo’s rubric guidance and exemplar IAs to calibrate what “enough evidence” looks like in real coursework.

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IB Physics IA Ideas: Best Topics for 2024

IB IB Physics IA

RevisionDojo Team

•Last updated: 19 Jul 2026•7 min read

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IB Physics IA Ideas: Best Topics for 2024

A Physics IA starts the same way for most IB students: a blank page, a half-remembered experiment from class, and a quiet fear that your “good idea” is actually too big, too vague, or too common.

The trick is simpler than it feels. A strong IB Physics IA is usually a small, measurable question with room for real analysis: uncertainties, graphs, and a conclusion that earns its confidence.

IB student vs variables: the ball protests

A quick checklist for a high-scoring IB Physics IA

Before you choose from the ideas below, make sure your IB IA topic passes these five filters:

One clear independent variable you can change in steps
One clear dependent variable you can measure repeatedly
Controls you can actually keep constant (or justify)
Enough data for meaningful processing (not just one perfect run)
Analysis headroom: uncertainty, linearization, model comparison

For rubric-specific guidance, keep the IB Physics Internal Assessment Guide open while you plan.

Best IB Physics IA ideas for 2024 (easy, moderate, hard)

Below are reliable IB Physics IA ideas that can be adapted into unique research questions. Each one is designed to be feasible in a school lab (or at home, safely), while still giving you space to think.

Easy IB Physics IA ideas (simple setup, strong fundamentals)

Projectile motion of a thrown ball (Mechanics)
Use video analysis to compare measured range/time-of-flight with kinematics. Connect to Kinematics notes for clean modeling.
Voltage vs current in a resistor (Electricity)
Build a V-I graph, test Ohm’s law, and discuss non-ohmic behavior if you warm the resistor. Pair with Current and circuits notes.
Refraction through different media (Optics)
Measure angles, test Snell’s law, and compare refractive indices with uncertainties.
Pressure vs volume in gases (Gas laws)
A classic that can still work if you add strong uncertainty treatment and a thoughtful evaluation.

Moderate IB Physics IA ideas (more control, better analysis)

Inclined plane angle vs acceleration (Mechanics)
Great for modeling frictional effects and comparing theory to measured motion.
Springs in series vs parallel (Mechanics)
Determine effective spring constants and evaluate energy losses. Use good graphing and error bars.
Cooling rate of different liquids (Thermal physics)
Newton’s law of cooling gives you a model to test, refine, and critique.
Speed of sound using resonance (Waves)
Use resonance tubes or bottles; compare to accepted values and explain deviations.

Hard IB Physics IA ideas (high ceiling, higher risk)

Damping in oscillating systems (Oscillations)
Estimate damping constants, compare models, and justify assumptions.
Terminal velocity and drag factors (Mechanics/fluids)
Excellent analysis potential, but you must control measurement quality.
Photoelectric effect vs light intensity (Quantum)
Powerful conceptually, but feasibility depends on equipment and calibration.

How to make your IB Physics IA idea feel original

Many IB students worry their idea is “too common.” Examiners usually care less about novelty and more about thinking.

Try one of these upgrades:

Add a second condition (two materials, two temperatures, two geometries)
Compare two models (simple vs more realistic)
Make uncertainty central using Uncertainties and errors practice

If you want to see what real high-quality coursework looks like, browse Physics IA examples or the broader IB Physics exemplars collection.

Systematic error: the phone has opinions

Where RevisionDojo fits into your IB Physics IA workflow

A calm IA process is usually a tool-driven process. RevisionDojo helps IB students move faster without guessing:

Use the Questionbank to sharpen your physics fundamentals (so your rationale and evaluation sound like you).
Use IB Physics resources and IB Physics notes to reconnect your idea to syllabus language.
Use AI Chat and Grading tools to stress-test your method and conclusion wording.
Use Flashcards and Study Notes when your IA overlaps with exam prep.
Use Mock Exams, Predicted Papers, and Tutors when you need momentum across the whole IB season.

For deeper IA scoring strategy, read IB Physics IA rubric explained.

2 a.m. topic debate: magnets vs pendulum

Final thought: pick the IB Physics IA idea you can finish

The best IB Physics IA ideas for 2024 are the ones you can execute cleanly, analyze honestly, and explain with confidence. Choose a topic that fits your time, your equipment, and your curiosity, then make it specific.

When you’re ready, use RevisionDojo to move from idea to execution: Study Notes for the theory, Questionbank for confidence, Coursework Library exemplars for structure, and AI Chat plus Grading tools to polish the final submission. Your IA doesn’t need to be flashy. It needs to be finished, focused, and undeniably IB.