Writing an extended essay in IB Physics can be one of the most rewarding parts of the DP, however it is notorious for being difficult. Unlike the regular lab reports you do in class, the Physics EE requires students to work like an actual physicist. Whether you are drowning in data or just trying to choose a topic, here are 6 helpful tips to help you achieve that elusive A.
1. Choose a topic you actually are interested in
The EE writing process takes a long time, so avoid choosing a topic simply due to it sounding impressive. Instead, choose a question that actually interests you. Whether it is resonance in a guitar, airflow in cycling, or efficiency in solar panels, curiosity plays a colossal role in motivating you when experiments become repetitive and processing and analysing data gets tedious.
A good research question should also be focused. For example, “How does renewable energy work?”, is too broad. “How does the angle of incidence affect the efficiency of a photovoltaic panel?” is more specific and manageable.
2. Make sure your physics is IB level
Your extended essay needs to have physics that matches or even exceeds the IB Physics syllabus. If the extended essay is too standard and only uses SUVAT equations for example, it will not reach the higher markbands for critical thinking and personal engagement.
Level Up: Look for topics where you can introduce slightly advanced concepts, like fluid dynamics or rotational mechanics.
Keep the essay balanced: Don't go so far into university-level quantum mechanics that you don't actually understand what you are writing down; you must be able to explain every single derivation clearly.
3. Prioritize a strong methodology for the experiment
If the experiment you are doing is sophisticated, that does not mean that it will lead to a better EE. Matter of fact, simple experiments that are conducted carefully often reach higher markbands than ambitious and overly sophisticated experiments which yield unreliable data.
In your methodology, clearly identify the independent, dependent, and controlled variables. Additionally, it should be clear that the measurements are repeated multiple times and which sources of error are present and how to minimize them. Demonstrating strong scientific knowledge is just as important as getting ‘perfect’ results.
4. Master the analysis of your errors and the uncertainties
When writing a physics extended essay, your data is only as good as your analysis of the uncertainties. If you plug a bunch of raw data into a table without error bars, your data analysis marks will plummet.
In the data processing, include everything. You need explicit absolute, percentage, and fractional uncertainties for all the raw data.
Additionally,your final graphs should include clear error bars, a trendline of best fit, and possibly and preferably a maximum and minimum trendline, and the worst acceptable fit. Use the gradient of these lines to calculate the final uncertainty in your experimental value.
5. Start data analysis early
What many students do is they spend months collecting data and only start analysing it when the deadline is near. This is highly risky. Analyse data as soon as possible to confirm whether your method actually produces meaningful and understandable results.
Calculate uncertainties, graph trends, and evaluate whether the chosen model fits the data. Completing the analysis early allows you to adjust your methodology before it becomes too late.
6. Do not just describe, critically evaluate
The discussion and the evaluation sections are where the standard essays have the chance to turn into excellent ones or really poor ones. Do not just state, “The value of g was found to be 9.5 ms-2 “; that is just a description.
Instead ask yourself “why?”. Why is the value different from the theoretical value of 9.81 ms-2? Was it a systematic error such as friction, or a random error like reaction time.
Additionally, it is important to be very specific in the description. Instead of saying the inaccuracies were caused by a human error, say “a 0.5 second delay in manual stopwatch operation introduced a 3% random uncertainty in the time intervals."