!! Physics 2015 ... predictions, guesses and discussion

randylonghorn

Barry1000 wrote: »

Lads I failed the pre with 34% but have put in a good amount of work the last few months. I'll got at it hard this weekend. I'm good at maths if that makes a difference, chances of me getting a C1 ?

None of us can tell you for certain, lad, but if you've been working at it since the mocks, probably pretty decent.

EoghanIRL

Troxck wrote: »

I'm planning on avoiding the Mechanics Section B. I had to do it in the mocks since the Q5 was horrible and we didn't have Particle Physics done at that time.

Thanks!

Yeah most people I knew answered the mechanics questions but it was always my intention to skip it and focus on the other questions on electricity and all the rest.
Saying that I still could have answered any mechanics question if I needed to. Good to have it as a back up or incase an easy mechanics question is thrown on the paper.

Hulk_buster

can someone give a list of experiments that are too easy to come up on a higher level paper and those that are almost sure not to come up

Dianabluex

how do you get the "d" when calculating the monochromatic of light ?

DuckSmokeQuack

Does anyone know if it's necessary to have all experiments written up for the exam? Like will they check or will I be okay?

Troxck

Dianabluex wrote: »

how do you get the "d" when calculating the monochromatic of light ?

d=1/Nx10^-3 Where N= Number of lines per metre on the grating!

Dianabluex

DuckSmokeQuack wrote: »

Does anyone know if it's necessary to have all experiments written up for the exam? Like will they check or will I be okay?

S**t i hope they don't come to my school , i don't have the written up forgot about until u brought it up I'm scared now :eek:

Troxck

DuckSmokeQuack wrote: »

Does anyone know if it's necessary to have all experiments written up for the exam? Like will they check or will I be okay?

The last date they can actually check that at Leaving Cert was the 9th of May, or around then. You're fine!

It would be good revision to write them up though.

Elemonator

Troxck wrote: »

Nail the experiments, definitions, demos and bulky theory!

It also depends how much work you have put in the last two years...

Reckon I could get that far by Monday?

zagaluke

Troxck wrote: »

d=1/Nx10^-3 Where N= Number of lines per metre on the grating!

Well usually N is given in lines/mm, so then you just have d=1/(Nx10^3) metres. If N is given in lines/m, then d would just be 1/N metres

Hulk_buster

do you have to convert the measurements for the diffraction grating to meters??

anybody know of any thread for economics predictions 2015?

TheNobleHylian

Basically I'm in a situation where I have everyday free till Monday to study for Physics.

Everything has gone well so far in the leaving cert,I'm happy with every subject but I've a very basic knowledge of Physics at the moment.I haven't been putting the work into it that I should have been.I'm fine with experiments and calculations but when it comes to definitions and derivations along with the long questions I've very little knowledge at the moment.

What would my best bet to basically cover most of the Physics course over the next few days? Exam papers or chapter by chapter revision.Also any predictions if anyone has any would be helpful.

zagaluke

Hulk_buster wrote: »

do you have to convert the measurements for the diffraction grating to meters??

Usually you do convert to SI units for calculations, you'll also need to convert the wavelength to metres as well (eg. 650nm=6.5*10^-7m). Whatever you do, make sure your units for d and lambda are the same, or else you might get something like sin(theta)=500 which isn't defined or sin(theta)=0.0005 which will give you an angle that's far too small

Dianabluex

TheNobleHylian wrote: »

Basically I'm in a situation where I have everyday free till Monday to study for Physics.

Everything has gone well so far in the leaving cert,I'm happy with every subject but I've a very basic knowledge of Physics at the moment.I haven't been putting the work into it that I should have been.I'm fine with experiments and calculations but when it comes to definitions and derivations along with the long questions I've very little knowledge at the moment.

What would my best bet to basically cover most of the Physics course over the next few days? Exam papers or chapter by chapter revision.Also any predictions if anyone has any would be helpful.

right now I'm just doing exam questions , I've learned all my def , derivations and experiments that i think are more likely to come like boyle law , heat: hot copper , vaporization or latent , monochromatic , resitivity of nichrome wire , focal length ,

TheNobleHylian

Dianabluex wrote: »

right now I'm just doing exam questions , I've learned all my def , derivations and experiments that i think are more likely to come like boyle law , heat: hot copper , vaporization or latent , monochromatic , resitivity of nichrome wire , focal length ,

Thanks,

I think I'll try go through each chapter individually over the next two days and write out each definition and derivation on flashcards,get a general understanding of everything and do some exam questions and then I will spend Saturday and Sunday constantly doing exam questions.Hopefully that should have me in a better place than I am at the moment.

Benm123

Hey, what's everyone's opinion on a full circular motion/satellite etc question coming in the long questions? Ive done probably every prediction possible for physics in terms of experiments likely to come up and I'd have almost guaranteed myself a long question on circular motion/satellites etc as they used to come up every year but now they haven't in the past few years! Because of this prediction I've absolutely nailed that chapter along with question 10 (guaranteed) and stuff in general for 5 and 12. But I haven't seen much talk about a circular motion question coming up here, what are your opinions on it? Do you think it will come up? Or are they now getting more focused on examining multiple chapters in the one question and are out of the habit of focusing solely on one chapter per question?

Troxck

Benm123 wrote: »

Hey, what's everyone's opinion on a full circular motion/satellite etc question coming in the long questions? Ive done probably every prediction possible for physics in terms of experiments likely to come up and I'd have almost guaranteed myself a long question on circular motion/satellites etc as they used to come up every year but now they haven't in the past few years! Because of this prediction I've absolutely nailed that chapter along with question 10 (guaranteed) and stuff in general for 5 and 12. But I haven't seen much talk about a circular motion question coming up here, what are your opinions on it? Do you think it will come up? Or are they now getting more focused on examining multiple chapters in the one question and are out of the habit of focusing solely on one chapter per question?

They've neglected SHM/Hooke's Law etc. for Mechanics in recent years so it is bound to show, but again, the SEC want to avoid predictability and so on...

What experiments do you reckon are likely to come up?

Elemonator

i too only got 34 in the mocks. is it possible to get to a b3 over the weekend?

Benm123

Troxck wrote: »

They've neglected SHM/Hooke's Law etc. for Mechanics in recent years so it is bound to show, but again, the SEC want to avoid predictability and so on...

What experiments do you reckon are likely to come up?

Is there really that much they can ask on hookes law or SHM? I can definitely see them coming up in a Q12, but I can't see hookes law taking up a whole question, we'll maybe with SHM, who knows. Guess I'll look over that this weekend!

Experiments, I obviously can't know for sure, but if you're smart enough you can eliminate at least half of the experiments on the course. The ones that I'd certainly know well are;
- Gravity by freefall/pendulum
- Heat, would be v surprised if one didn't come up.
- Resistivity of nichrome wire
- Monochromatic light
- Thermistor/resistance experiment (can't remember the name)
- Fundamental freq. of string with tension/length.

These are ones that haven't come up in a good few years, as always they usually throw in one or possibly even two that are unexpected, but I'd make sure I know these few inside out before heading in!

Cr4pSnip3r

I've no idea what I do be doing when it comes to Physics.

Troxck

Benm123 wrote: »

Is there really that much they can ask on hookes law or SHM? I can definitely see them coming up in a Q12, but I can't see hookes law taking up a whole question, we'll maybe with SHM, who knows. Guess I'll look over that this weekend!

Experiments, I obviously can't know for sure, but if you're smart enough you can eliminate at least half of the experiments on the course. The ones that I'd certainly know well are;
- Gravity by freefall/pendulum
- Heat, would be v surprised if one didn't come up.
- Resistivity of nichrome wire
- Monochromatic light
- Thermistor/resistance experiment (can't remember the name)
- Fundamental freq. of string with tension/length.

These are ones that haven't come up in a good few years, as always they usually throw in one or possibly even two that are unexpected, but I'd make sure I know these few inside out before heading in!

It's a handy question if it was to come up as a full long question. It would be a nice Q12 too.

So many students and teachers are highlighting those, I hope they come up. I'm fairly bad at the Heat experiments so I'm not doing them, is that too risky?

The_N4sir

Troxck wrote: »

It's a handy question if it was to come up as a full long question. It would be a nice Q12 too.

So many students and teachers are highlighting those, I hope they come up. I'm fairly bad at the Heat experiments soI'm not doing them, is that too risky?

What do you find difficult about them?
IMO they are very nice expt questions because there is not a lot of stuff that they can ask for each.
I find the 15/18 marks for the calculations lovely....very easy marks IMO

Troxck

The_N4sir wrote: »

What do you find difficult about them?
IMO they are very nice expt questions because there is not a lot of stuff that they can ask for each.
I find the 15/18 marks for the calculations lovely....very easy marks IMO

I cannot remember the calculations for each experiment. I understand them but in an exam calculation I know I'd panic and mess it up

jam17032010

It is international year of light. http://en.m.wikipedia.org/wiki/International_Year_of_Light

I would definitely know that section. And any other section that light appears.

The physics section of the JC Science paper had lots of light questions. Dispersion, ray diagrams for reflection/refraction, LDRs, bulbs in series/parallel.

Doubtful it's the same person making out the papers but if they are of a similar mindset...

GuyWithAFace

Would I be covered with knowing all electricity, mechanics and light experiments or should I go over heat too? I'm leaving sound out cause I doubt two sound experiments would come up.

The_N4sir

GuyWithAFace wrote: »

Would I be covered with knowing all electricity, mechanics and light experiments or should I go over heat too? I'm leaving sound out cause I doubt two sound experiments would come up.

Heat has not come up since 2010 i think so IMO i would. They are nice questions aswell

Cr4pSnip3r

The_N4sir wrote: »

Heat has not come up since 2010 i think so IMO i would. They are nice questions aswell

Heat questions are awful, would you go away. Those formulae are terrible.

Troxck

Cr4pSnip3r wrote: »

Heat questions are awful, would you go away. Those formulae are terrible.

I'm so glad I am not alone in that. I'm totally ignoring them, hopefully the SEC aren't cruel enough to put two of them on the paper.

I'm doing all Mechanics, WLS and Electricity experiments though.

The_N4sir

Cr4pSnip3r wrote: »

Heat questions are awful, would you go away. Those formulae are terrible.

It is just my opinion:P
Anyway I am not a big fan of the Electricity experiments except the nichrome wire one so I guess it evens out.

Krydan

Cr4pSnip3r wrote:

Heat questions are awful, would you go away. Those formulae are terrible.

How is it terrible?
It's just ml+ mc(delta)(tithe)= mc(delta)(tithe) + mc(delta)(tithe)

Right?