AQA A-Level Equations that aren't givenWatch this thread
- SHM formulae (every last one, even the weird fruity looking energy equation that relates amplitude and such)
- Kinetic theory formula (p = (1/3)*density*c^2... I'm just going to go derive that one now :-
- Circular Motion v^2 / r formula
All the above three are formula derivations that seem to have popped up in questions on my past papers or IAL past papers, and it appears as though they don't directly require derivation but instead require usage at a step of the derivation, i.e. rather than using the formulae given on the sheet you must take a step back and utilise a different method.
I'll ask my teacher on Monday to see if she could make a formula sheet or tell me some, or perhaps someone else may provide them :P
formula sheet gives you
Q=Q0 e-t/RC *
which rearranges to
ln Q - ln Q0 = -t/RC
which is likely what the questions will need
There is also a Gravitational frields formula for orbits , the T^2=4(pi)^2*R^3/GM which is derived from V=2(pi)R/T and V=Squarerootof(GM/R)
In addition there are a few more circular motion equations:V^2/R , also Angular speed=angle/t
There are a few capacitors equations too which i cannot remember , but one is Timetohalf=0.69RC , and a few for Charging and discharging which are not given.
you also don't get given the stopping potential of an electron , in the photo electric effect stopping potential=KE/charge of electron
the escape velocity of an orbit is not given: v=squareroot(2GM/R)
there a few more which i do not remember of the top of my head , but hope this helps
Gravitational fields topic:
as above, escape velocity
- A=A0e-(wavelength)t where A is activity
- C=C0e-(wavelength)t where C is count rate
- (this isn't really an equation just a method that'll definitely want to remember for this topic) M defect= Zmp + (A-Z) mn - Mnuc (..where M is mass)
I've also seen a question that requires some vague knowledge that intensity is equal to power per unit area or I=P/A
I find that equations not given tend to pop up in multiple choice more often than actual calculation questions so it'll be best to memorise them so you can get through multiple choice faster at the end of the paper.
This doesn't include all the derivations you need to learn.