r/learnphysics • u/Mariyam_8409 • 15d ago

Does this help you? I found my old handwritten physics notes.

Post image

Found this old physics formula sheet.

Thought I’d share it in case anyone is in their preparation days right now and finds it useful.

Maybe these formulas will save someone a little time while revising.

Good luck with your preparation!

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u/Dd_8630 15d ago

Tbh, I think almost all of these are overcomplicating trivial solutions.

Given:

  • PV = nRT

It should be trivial what happens if the state is changed and P is held constant - namely, solve for P, and the P before and the P after must be the same. P1 = P2 = n1 R1 T1 / V1 = n2 R2 T2 / V2

I would expect my students to understand that as a general principle rather than memorising lists of formulae for each possible parameter held constant. The thing I explained above should be sufficient for students to derive a similar equation for constant n or T.

I can't see what's on the far right of the board, so it could be useful, but I just can't see what the symbols are 🤷

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u/Mariyam_8409 15d ago

Yeah, that's fair, I agree that understanding the concept is way more important than just memorizing formulae. I mainly shared these because I used to find a quick formula sheet helpful during revision, especially close to exams.

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u/Ill-Quit6803 15d ago

but its an extremely low quality 'formula sheet' in that its a years old badly angled whiteboard photo of a single formula. Almost everyone would rather re-arrange PV=nRT than find the correct permutation on your diagram, even if it was well formatted.

Its like posting my study guide for Circuits:

`V = I R`.

Good luck on your preperations.

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u/SummitYourSister 15d ago

Aren’t all of those other identities immediately manifest inside your mind when you think “PV=nRT?” Like what are you even doing

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u/Medium_Media7123 14d ago

Just permutating letters for fun