AQA A Physics Unit 4 24th Jan 2012

Good luck to everyone for tomorrow and to me (I hope wishing yourself luck still works, I'm going to need some :tongue:

).

Reply 384

wasting-time

9

Original post by paul272

thanks but why does time period half when length is decrease by 4 times

T = 2pi x root(l/g), as 2pi and g are constants the only value that can change is l. as it involves a root l must be divided by 2^2 rather than 2 in order for T to be divided by 2.

Reply 385

Original post by skibur

it cant be just me thats found the AS -> A2 jump ridiculously hard?

No dont worry, ive found it ridiculously hard as well :frown:

Reply 386

robthefool

Really bricking it for this one.. compared to unit 1 and 2 this is hell. The only good thing is that the grade boundaries have been low for the past 4 years.. from 48-50/75 for an A, so you can get full marks in the written part and skip the whole multiple choice and still get an A!

Reply 387

laughingbagel

Original post by tuckaa

V=ED is the electric field strength x distance separation giving you the voltage

W=QV is the potential energy = charge x electric potential

So the 'vs' represent different things so you cant.

But if the field is uniform, aren't voltage and potential interchangeable? :s-smilie:

Because both voltage and potential have the unit JC-1?

Reply 388

Original post by LookIt'sPete

I would love no 6 markers at all :biggrin:

that would just be a dream come true :biggrin:

but very unlikely to happen :frown:

Reply 389

Andogoran

Im wondering for the circular motion of a charged particle in a magnetic field, do you use the Right hand rule?

So the MOTION is acting towards the centre of the circle
Current is acting as velocity / what direction it is spinning in
and Field is vertically up / down?

Reply 390

Original post by robthefool

Really bricking it for this one.. compared to unit 1 and 2 this is hell. The only good thing is that the grade boundaries have been low for the past 4 years.. from 48-50/75 for an A, so you can get full marks in the written part and skip the whole multiple choice and still get an A!

Yeah I know, the best grade that ive got so far in the past papers is a D so really worried :frown:

when I first took physics I was really good at it and wanted an A overall, but that just seems like a joke now

Reply 391

robthefool

Original post by npaul4

Yeah I know, the best grade that ive got so far in the past papers is a D so really worried :frown:

when I first took physics I was really good at it and wanted an A overall, but that just seems like a joke now

Yeah I know.. At GCSE I was getting As and A*s easily but now it is just a joke! A B is probably the best I can get.. but I have also been getting low marks on past papers... really do not like unit 4 at all

Reply 392

laughingbagel

Is Unit 5 any easier? :frown:

I need to get a B this year and I can't even get a good C on Unit 4. :frown:

Reply 393

Original post by robthefool

Yeah I know.. At GCSE I was getting As and A*s easily but now it is just a joke! A B is probably the best I can get.. but I have also been getting low marks on past papers... really do not like unit 4 at all

I think what makes it worse, is that everyone else seems to understand it all :frown:

makes me feel like an idiot despite getting reasonably good as grades physics

Reply 394

Original post by laughingbagel

Is Unit 5 any easier? :frown:

I need to get a B this year and I can't even get a good C on Unit 4. :frown:

I guess it depends on what optional topic you do but my teacher said that unit 4 is definately harder than unit 5 so im kinda relying on that lol

Reply 395

robthefool

Original post by npaul4

I think what makes it worse, is that everyone else seems to understand it all :frown:

makes me feel like an idiot despite getting reasonably good as grades physics

Yeah, I just do not like the topics at all! They are not interesting.. And yeah I did ok with AS physics but I have to do well because I need a B overall.. I don't understand the magnetic topics as much so I'm tempted to just revise extra hard for the other topics to get as many marks as possible there

Reply 396

AreebWithaHat

18

Original post by Accalia

Good luck to everyone for tomorrow and to me (I hope wishing yourself luck still works, I'm going to need some :tongue:

).

Thanks, good luck to you as well

Reply 397