# Formulas not in data booklet to Memorize for HL exam?

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Hey guys,

Studying for the HL physics exam, and I noticed some of the important formulas are not in the data booklet. Can anyone who wrote the exam already/ is studying also give me a good list of important formulas to memorize which aren't in the data booklet?

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I've found that most formulas can be derived even if they are not in the data booklet, i.e. centripetal force is not in there - but centripetal acceleration is, so you only have to multiply by m. There are multiple formulas that you have to be able to derive, some of those are in the formula booklet but not all. I always seen to forget a = -(w^2)x for SHM, and I tend to struggle with deriving Kepler's law (T^2 is proportional to R^3) because I can't remember what I'm supposed to find haha.

What formulas did you miss?

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My teacher didn't specify which formulas we have to know how to derive, which ones would that be?

Vioh, thanks I'll definitely check it out!

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They should all be in the syllabus if you have a copy - just do a quick search for "derive". The ones I can remember are Olber's paradox (not technically a formula, I guess), theta = b/lambda, Kepler's law, escape speed from a planet, v = f*lambda.. Probably missed something, though.

EDIT: with lambda being wavelength, in case you're not up to speed with your Greek alphabet

Edited by Sofia.

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a lot of the formula's are definitions of things like v=e/q for volts of a=(v-u)/t for accelaration

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