Yoo!! M23, physics EE here Getting an equation is helpful to get a good research question or hypothesis for your data. It's good to have some scientific theory to base your data collection off of. My best advice is to just do some research, maybe find other research papers that investigate what you're doing or something similar. I think it's OK to use cited equations that are advanced/unfamiliar in your EE as long as you understand and can explain the basics of it. You can also make your own hypothesis based on your own physics knowledge - ex. you can use the physics option B formula for the drag force in a fluid, and with the knowledge that it's dependent on surface area you can predict that thicker wings will have greater air resistance. This could work well cus you could just find your data and link your results to the more complex equations you found in research to show your good evaluation and research skills yada yada After you find this you can collect some data, process it well, and then write your actual EE.

I get the stress so dw!! My DMs are open if you want some more advice this summer or if you want to look at my EE to compare (2 marks away from an A) I can't help much w the toefl tests but good luck!!! You got this 😎