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

kcull

- Monochromatic light/resistivity of a wire Sect A (two of the big three exps and haven't come up in a good while esp the latter!!)
- Heat exp? It's been a while

All conjecture, I know someone who writes the exams and the general guidelines for "predictions" is don't do them obviously, but if you're going to, don't look so much at "patterns" but at 1. what was answered terribly at OL, they then ask it at HL because they suspect the teachers aren't teaching it well (same for what was answered badly last year on HL) and 2. have a gander at the chief examiner's report if you were lucky enough to do a subject that got one last year, they're usually pretty indicative of what they'll ask again

Again, all conjecture, have a bit of cop on and don't leave yourself bare anywhere! best of luck to everyone

Fiona G

Physics: I think the mechanics long question might be on moments and torque. Pressure and flotation hasn't been up in a very long time either. Thinking the nuclear question might involve radioactivity.

Dianabluex

For phyics heat experiment , biology viruses and cells chapters , maybe endocrine as long question (pleaseeee LOL) physics heat experiment, English othello could be a female character question , chemistry chromatography , experiment iron tablet , clove oil

Shazwazz927

I don't see a Physic thread for 2015 predictions (well a good one). So fell free to post your hot tips below. I'm very interested to see what people are thinking will come up. Though I know Physics is an exam where literally everything and anything can come up.

Peregrine

I've moved some physics predictions from this thread to here.

Troxck

Physics is definitely one of the hardest subjects to predict as there really isn't a pattern at all, which is good in a way.

For Section A I say that because a heat experiment hasn't appeared since 2010, there is a higher chance of one of those appearing. For the Mechanics experiment, possibly F proportional to A and maybe G by free fall. The Waves/Light/Sound experiment that everyone seems to be saying is Monochromatic and possibly Frequency related to length and tension. For Electricity, resistivity or an I/V related one. Honestly, there are only 24 experiments and you'd be foolish to leave one out.

Section B is virtually impossible to predict. For Mechanics I am guessing either Hooke's Law or Circular Motion, for W/L/S one related to either Optics or Sound. After that, no clue. All of these are from just going through past papers and seeing what is popular and hasn't appeared in recent years.

You're better off preparing what you're good at rather than relying from predictions from fellow students.

If you learn the 24 experiments, Mechanics, W/L/S, Modern Physics and the option, you'll be grand. I'm studying Electricity and Heat on top of these but I have known people who got on well while leaving those two sections out.

DarraghF197

Just a few small predictions:

Heat experiment in Section A
Simple Harmonics motion
The Doppler effect
Thermionic/Photoelectric emission

qweerty

Troxck wrote: »

Physics is definitely one of the hardest subjects to predict as there really isn't a pattern at all, which is good in a way.

I don't agree at all. The structure of the paper is very similar every year. Aside from the experiments (where there is always one from mechanics and one from electricity), there's 1.5 x mechanics, 1/1.5 x electricity, usually 1 x modern physics and x 1.5 sound/waves and light. Plus the option. Within each section, there are only a handful of topics that can make up a full question and they don't normally repeat. Mechanics generally alternates between planetary motion and a question involving newton's second law or equations of motion. There are other trends too.

OMGeary

Can you be asked to label or describe the function of parts of the eye

Troxck

OMGeary wrote: »

Can you be asked to label or describe the function of parts of the eye

Yes amd No, we do have to know the functions of certain parts. It usually comes up with the power of a lens etc. Its not a major part but look over it.

By the way, what's your plan of action for the exam, what questions do you plan on answering? For the experiments, I'm hoping for Mechanics, Electricity and WLS. For Section B I will hope to do Q5, 12, 10(a), hope for a Modern Physics and hope for an Electricity. I could and probably will swap Q5 for the Mechanics.

OMGeary

Troxck wrote: »

By the way, what's your plan of action for the exam, what questions do you plan on answering?

Don't really have a plan. Will pick the 3 nicest experiments and try for the forth if I have time.
Will definitely Q5 and 12 plus whatever mechanics questions come up. Will probably do the particle physics and then just pick what ever else looks nice.

Great Disapointments

My teacher is predicting gravity due to free fall, latent heat experiments and resistivity of wire experiment
He's convinced that there will a light question and that the nuclear physics will be somehow tied up with radiation and x rays
He said he's hoping for a nice particle physics question but it's looking like they'll make it harder as its a guaranteed question and they want to make you work for the marks

Troxck

Great Disapointments wrote: »

My teacher is predicting gravity due to free fall, latent heat experiments and resistivity of wire experiment
He's convinced that there will be a light question and that the nuclear physics will be somehow tied up with radiation and x rays
He said he's hoping for a nice particle physics question but it's looking like they'll make it harder as its a guaranteed question and they want to make you work for the marks

Our teacher has said the same experiments would come up. I really hope a nice WLS experiment comes up too as I am terrible and the Heat Experiments.

For modern Physics, the last few years have been focussed on fusion/fission so I suppose they will go back to the electron.

For WLS our teacher says possibly a lens one or to do with sound, I hope he's wrong, I hate them!

Anyone making any headway with the derivations? I have maybe 2/3 learnt...

lc2015x

Right lads, these were basically the predictions my teacher hopes will come up this year;

Practical experiments;
Resistivity of wire has a good chance.
Freefall/gravitational
Thermistor OR a metal exp
A heat experiment is definitely one to study!

Long questions;
Lenses could come up
An atomic OR electron question
Electromagnetic full question!
Electrostatics would be one too
He's been concerned about the Vann De Graff generator so study a question on that!
The eye hasn't come up in a ages..
Snells window
Doppler effect(long q)
The definition of Ampere & how to demonstrate it is one to watch out!!!
Thermionic emission
Einstein's photoelectric effect
I'd study Wheatstone's bridge too! Hasn't been asked for a while!

Lads don't just rely on the topics I mentioned above, my teacher just gave us stuff that hasn't been asked for quite some time

In return can someone pls tell me the list of definite derivations a higher level physics paper could be asked?? Thanks a million!

DarraghF197

I'm pretty sure this is accurate. Got this off teacher in Christmas course grind:

V=u + at
S=ut +.5t*2
V*2=u*2 + 2as
F=ma
V=rw
G=Gm/R*2
T*2 =4pier*2r*3 all over GM
Nlamda=dsin(theta)
R=R1 + R2
The inverse of above
F=qvb (what?! That's on it!)

I'm not sure how accurate this list is. I think there's other things he didn't mention such as a=w*2s. The syllabus on Curriculumonline.ie has the derivations anyways as well.

lc2015x

Alright! Thanks a million!

DarraghF197 wrote: »

I'm pretty sure this is accurate. Got this off teacher in Christmas course grind:

V=u + at
S=ut +.5t*2
V*2=u*2 + 2as
F=ma
V=rw
G=Gm/R*2
T*2 =4pier*2r*3 all over GM
Nlamda=dsin(theta)
R=R1 + R2
The inverse of above
F=qvb (what?! That's on it!)

I'm not sure how accurate this list is. I think there's other things he didn't mention such as a=w*2s. The syllabus on Curriculumonline.ie has the derivations anyways as well.

OMGeary

lc2015x wrote: »

Right lads, these were basically the predictions my teacher hopes will come up this year;

Practical experiments;
Resistivity of wire has a good chance.
Freefall/gravitational
Thermistor OR a metal exp
A heat experiment is definitely one to study!

Long questions;
Lenses could come up
An atomic OR electron question
Electromagnetic full question!
Electrostatics would be one too
He's been concerned about the Vann De Graff generator so study a question on that!
The eye hasn't come up in a ages..
Snells window
Doppler effect(long q)
The definition of Ampere & how to demonstrate it is one to watch out!!!
Thermionic emission
Einstein's photoelectric effect
I'd study Wheatstone's bridge too! Hasn't been asked for a while!

Lads don't just rely on the topics I mentioned above, my teacher just gave us stuff that hasn't been asked for quite some time

In return can someone pls tell me the list of definite derivations a higher level physics paper could be asked?? Thanks a million!

If you go to http://thephysicsteacher.ie/leavingcertphysicsrevision.html and download the revision guide it has all the derivations

Troxck

DarraghF197 wrote: »

I'm pretty sure this is accurate. Got this off teacher in Christmas course grind:

V=u + at
S=ut +.5t*2
V*2=u*2 + 2as
F=ma
V=rw
G=Gm/R*2
T*2 =4pier*2r*3 all over GM
Nlamda=dsin(theta)
R=R1 + R2
The inverse of above
F=qvb (what?! That's on it!)

I'm not sure how accurate this list is. I think there's other things he didn't mention such as a=w*2s. The syllabus on Curriculumonline.ie has the derivations anyways as well.

https://www.google.ie/url?sa=t&source=web&rct=j&ei=0VhsVbz-HqvY7AaMx4KICg&url=http://lawlessteaching.eu/physics/Derivations.pdf&ved=0CB8QFjAB&usg=AFQjCNHCwzs45SfQvjKtZPalx_SIcfcsqw

The F=qvb is very simple. Its force on a moving charge.

You "consider a section of conductor of length L through which a current I is flowing"

So, I=q/t q=It and V=L/t L=vt.

F=ILB, F=(q/t)(vt)(B)
F=BQV

F=nqvB

n=1

F=qvB.

This is off the top of my head so mistakes have been made probably!

DarraghF197

Troxck wrote: »

https://www.google.ie/url?sa=t&source=web&rct=j&ei=0VhsVbz-HqvY7AaMx4KICg&url=http://lawlessteaching.eu/physics/Derivations.pdf&ved=0CB8QFjAB&usg=AFQjCNHCwzs45SfQvjKtZPalx_SIcfcsqw

The F=qvb is very simple. Its force on a moving charge.

You "consider a section of conductor of length L through which a current I is flowing"

So, I=q/t q=It and V=L/t L=vt.

F=ILB, F=(q/t)(vt)(B)
F=BQV

F=nqvB

n=1

F=qvB.

This is off the top of my head so mistakes have been made probably!

Thanks a million! That's really a really handy document yeah we've never used that equation before never mind derived it, I just saw it by chance in some notes thing I had for electron theory I think.

Troxck

DarraghF197 wrote: »

Thanks a million! That's really a really handy document yeah we've never used that equation before never mind derived it, I just saw it by chance in some notes thing I had for electron theory I think.

Electricity/Electromagnetics is my favourite section so that's why I know it.

The derivations aren't too bad really!

DarraghF197

Troxck wrote: »

Electricity/Electromagnetics is my favourite section so that's why I know it.

The derivations aren't too bad really!

Lol I'm the complete opposite! I'm doing everything but electricity, unless you call electrostatics part of electricity. I always found electricity to be quite confusing and I prefer sticking to the maths and modern physics sections.

Troxck

DarraghF197 wrote: »

Lol I'm the complete opposite! I'm doing everything but electricity, unless you call electrostatics part of electricity. I always found electricity to be quite confusing and I prefer sticking to the maths and modern physics sections.

I seem to be the only person who actually enjoys the Electricity section. My friend and I wanted to do Applied Electricity instead of Particle Physics but our teacher always taught option (a) so we just got over it.

I like Mechanics but more so the SHM/Hooke's Law and Circular Motion sections.

Troxck

Am I the only one starting to worry about the exam on Monday? Inreslly hope its nice, I'm aiming for a B1 at least...

Anyone have any last minute tips?

Dianabluex

Troxck wrote: »

Am I the only one starting to worry about the exam on Monday? Inreslly hope its nice, I'm aiming for a B1 at least...

Anyone have any last minute tips?

our teachers says exam questions are key just keep practicing all of them they repeat

Krydan

Although I am able for any experiment that comes up, I'm guessing that the experiments will be:

-Free fall
-Resistivity of wire
-Monochromatic Light
-Latent heat of fusion

Would I be right in thinking so?

And yes, doing all the exam questions over and over is the best way to prepare for the physics exam in particular.

EoghanIRL

Troxck wrote: »

Am I the only one starting to worry about the exam on Monday? Inreslly hope its nice, I'm aiming for a B1 at least...

Anyone have any last minute tips?

Pick your questions wisely. I completely avoided the section B mechanics section in last years exam and still managed to get an A.

Make sure to read the questions carefully as they are unlabeled.

Have the theory known inside out and take your time with the calculations!

Do the easy questions like the short questions, particle physics etc..

Troxck

EoghanIRL wrote: »

Pick your questions wisely. I completely avoided the section B mechanics section in last years exam and still managed to get an A.

Make sure to read the questions carefully as they are unlabeled.

Have the theory known inside out and take your time with the calculations!

Do the easy questions like the short questions, particle physics etc..

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!

Elemonator

how hard would it be to get a C1-B3?

Troxck

Elemonator wrote: »

how hard would it be to get a C1-B3?

Nail the experiments, definitions, demos and bulky theory!

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

Barry1000

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 ?

Troxck

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 ?

Just have a good exam strategy and have a decent idea of what questions you'll attempt. My friend went from an E to a C2 with putting little effort in and he wouldn't have been strong with Maths.

You've put the effort in, you'll be fine!

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.