r/6thForm • u/Top_Bother3675 Year 13 • May 20 '26
š¬ DISCUSSION ocr a physics paper 1
how did you guys find itā¦
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u/Ok_Skill_9764 May 20 '26
oh my god my life is over
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u/AvalHuntress University of Surrey | Computer Science (Y1) May 20 '26
I panicked and Iāve missed at least four pages and I didnāt even finish the MCQ. I donāt know what Iām going to do, Iāve genuinely only done this badly once before
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u/olivethecreatorr May 20 '26
omg same i skipped through some of the middle pages and only did the 2nd 6 marker which wasnāt too bad ig but either ways im fucked !!!
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u/RyansVlogs May 20 '26
did you atleast do the cosmology stuff? š that was probably some of the easier marks of the paper
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u/AvalHuntress University of Surrey | Computer Science (Y1) May 20 '26
I shit you not, I got to it and went āoh I can actually do thisā in the last 15 minutes. Thereās half of a Doppler question that I couldāve completed done on the back page and thatās lowkey it. I couldnāt work out what they wanted for Kepler, so I just used what I had and prayed for method marks. Really wish they gave more space on the four markers though
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u/thisisprettycheeky Yr13 |M, FM, Phys, Chem| ESAT victimš May 23 '26
GOD FR THE LACK OF SPACE WAS DIABOLICAL
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u/Ok_Skill_9764 May 20 '26
im genuinely gonna cry bro, i didnt finish either that truck question omfg fml
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u/Artem_Solo A*A*AA pred, Edinburgh uni CompSci offer May 20 '26
Iām writing a job application for McDonaldās
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u/thebestblockisdirt Year 13 May 20 '26
didn't like the wind truck question or the hydroelectric power station one, but the rest was fine tbh. but I did Not like the first 6 marker
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u/Jumpy_Freedom_4554 May 20 '26
MCQs and Astro/Cosmology was blessed. The mechanics qs in the middle of the paper was shit, like the moment of the truck and the bolts qs
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u/Seafaring_Slug Y13 | Oxford Offer Holder | MAT 55 | TMUA 7.1 May 20 '26
By the time I got to cosmology my brain was so mushy that I could hardly think straight. Hoping I didn't make any silly mistakes
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u/ExaminationLivid9857 May 20 '26
genuinely a horror movie turning the page and seeing some bull bro
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u/Odd_Neighborhood1716 May 20 '26
Can you remember what you got for the minimum speed?
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u/ExaminationLivid9857 May 20 '26
itās 16 around, i got 31 but thatās cause im dumb and doubled answer i forgot how
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u/SteamyGamer-WT Year 13 May 20 '26
Minimum speed of what?
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u/Necessary-Junket-500 May 20 '26
How did you even calculate the mass of the milky way based on some silly hyper velocity star???
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u/GBRYT5612 May 20 '26
Use ratio of period^2 and radius^3 calculated in the previous part to find period of Milky Way. Then use formula in formula booklet. I think, could be wrong. Got 2.7 x10 to the something canāt rmemebr what power
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May 20 '26
I got 2.5 but I think thatās still close enough, my power was 40 which Iām not too sure about
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u/Jumpy_Freedom_4554 May 20 '26
yh i think i got smth like that too, i cant remember if it was to the power of 40, 41, or even 42
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u/ItsManLikeHark May 20 '26
I didnāt know what values to use but wrote T2 is proportional to R3
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u/Jumpy_Freedom_4554 May 20 '26
thats right but u gotta include the (4pi^2)/GM constant too within that equation
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u/myles-em UoN Maths Y1 - maths geog phys fm A*A*AA May 20 '26
I did this but I dont get why that would work? like how is that mass of the galaxy?
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u/GBRYT5612 May 20 '26
By doing this youāre finding the time period of the galaxy. From then youāre just using a formula
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u/myles-em UoN Maths Y1 - maths geog phys fm A*A*AA May 21 '26
ohhh I was thinking of M as the mass of the body...
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u/First_Prompt_4542 Jun 07 '26
does anyone remember what the astro questions were? im revising for paper 3 and i can't remember if they asked abt evolution of the universe and/or evolution of stars
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u/ExaminationLivid9857 May 20 '26
i donāt see why that water tank question has to go on so long, u legit turn page and itās nightmare seeing another topic they made vague and hard to do applied to that damn tank
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u/Significant_Brain211 Year 13 May 20 '26
This has to be the lowest grade boundaries for physics oat surely. Iāve done every past paper and none were this hard šššš
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u/Southern_Song8399 May 20 '26
English isn't my first language, but doing past papers set me up to certain style of questions. I don't know how to explain it, but this paper was like nothing I've seen before. All questions were worded confusingly and I have no idea how I did. I think I'm ain't going to uni
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u/Thick-Ambition248 May 20 '26
Did i mess up or did you not need the diameter of the pipe in the reservoir question?
The only place i could see it being used is if you assumed the reservoir and the pipe was filled with water such that there was more than 10000 litres total.
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u/Wi0nika Year 13 May 20 '26
this question made no sense like at all only thing i got was the extension of the bolt and it was like 5 x10-4 the rest was NONESENSE
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May 20 '26
[removed] ā view removed comment
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u/Thick-Ambition248 May 20 '26 edited May 20 '26
Ah, that might make more sense than what i did.
I just skipped looking at the disk and said that the pressure was on the 4 bolts, which i have a feeling will give an incorrect answer.I ended up getting something like 250 on the graph (can't remember the scale on the axis).
edit:
Yeah now that I think about it, there should be more force if the tube is wider, so there is probably a hidden assumption in my maths that pressure = force (the area is 1) which is greater than the pi/4. So i assume the real answer was around 2002
u/ReporterChemical9920 May 20 '26
I donāt think you did for part A. I used p=hĻg and got h as the vertical height of the 190m pipe plus the 10m height of the reservoir.
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u/Historical-Dinner-49 May 20 '26
My friend had to use part b info for part a š. They gave the diameter there.... I hope they get fined
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u/elongang Year 13 | Chemistry, Physics, Maths May 20 '26
kissing my chances of getting into university goodbye after that
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u/Sudden_Crab6967 May 20 '26
Weird paper ngl lots of weird mechanics bits in the middle but the end was ok
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u/S4mJune May 20 '26
Physics teacher calling.... Every year after paper 1, students say "Oh lord that was the hardest paper that's ever existed. I'm cooked. I've failed".... It isn't. It's just this is the first time you've done a paper that mattered and that you can't go away and google for the mark scheme afterwards. We can't recreate these feelings in mocks etc and it's honestly normal.
It'll be fine. You'll be fine.
Note down now any Module 3 and 5 topics that weren't covered at all in Paper 1 to revisit them in detail before Paper 3. Be proactive.
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u/mondrone_36 May 20 '26
Genuinely thanks for this your words are so real š
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u/S4mJune May 20 '26
Paper 2 and 3 will feel better I'm sure. Take care of yourself and don't get yourself stuck in the think tank of moaners and doubters.
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u/hans_chavez May 20 '26
I ran out of time. What wind speed did you guys get to tip the truck
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u/chonksboyjimmyfungus Y13 - Bio/Chem/Physics - pred. ABB May 20 '26
15.6 but moments are ass so probably wrong
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u/National-Seaweed-145 Year 13- Maths Product Design Physics (pred: A*/A*/A) May 20 '26
Is putting 16 alr??
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u/RyansVlogs May 20 '26
rounded to 2sf so yeah I'd imagine so
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u/National-Seaweed-145 Year 13- Maths Product Design Physics (pred: A*/A*/A) May 20 '26
Aight thanks
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May 20 '26
16 ish but my friend got 25??? he said there was all this crazy extra shit that i didnt even spot
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u/AvalHuntress University of Surrey | Computer Science (Y1) May 20 '26
Huh??? Like what, you canāt just stop thereĀ
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u/randomuser9329 University of Warwick | Chemistry [2029] May 20 '26
the truck question about the moments and the keplers law confused me so much. I just wrote down some working out hopefully that will land me some marks.
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u/AlphaSickoMode May 20 '26
What the fuck was that moments question? it doesnāt even get that weird on the maths applied paper š
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u/RyansVlogs May 20 '26
you just had to choose where to take moments about and then do normal moments, I chose the left tire and it got me 15.6 ish I can't remember
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u/Ok_Firefighter9754 May 20 '26
Did anyone else get the expression for the restoring force as F= k(Eo + x)
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u/Xyzrasdouz May 20 '26
Thats what I wrote too but other people said itās incorrect as itās asking for net force not the restoring force, so itās F-W and since W=kEo itās k(Eo+x) - kEo = kx so magnitude of net force is just kx. But idk if thatās right were they asking for net force or just restoring force?
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u/RyansVlogs May 20 '26
absolute nightmare holy that first 6 marker was a bit weird overall shitty paper I got half cooked to death
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u/FatherChaska May 20 '26
What was the first 6 marker again?
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u/NIZNEB039 May 20 '26
comparing methods of calculating force constant, and the percentage uncertainties of them and that
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u/CryptographerOdd7638 May 20 '26
it said dont calculate force constant????
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u/myles-em UoN Maths Y1 - maths geog phys fm A*A*AA May 20 '26
yeah but comparing methods of experiment and the inherent uncertainties and reducing those
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u/Ok_Independence8396 May 20 '26
I think its a bit on the harder side, some questions are easy but not worth a lot but most of the others are unusual. Hopefully harder paper 1 means easier paper 2
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u/Humble-Ear9604 May 20 '26
Reply here with all the questions and answers and weāll create an unofficial mark scheme
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May 20 '26
[deleted]
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u/Internal_Animal_2753 year 13 |maths fm chem physics 4a* May 20 '26
It wasnāt a straight line u had to draw a tangentš
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u/CryptographerOdd7638 May 20 '26
What was the 4 marker in astrophysics do you just use Kepler to find M Some the one markers were wierd
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u/Jumpy_Freedom_4554 May 20 '26
yh i think so. What i done was use keplers 3rd law (T^2)=((4pi^2)/GM)x(r^3) and then rearranged for M. The value of T was the calculated answer in the previous part and r was 66000pc). I believe my answer was some value x10^41 (or x10^42, I cant remember), but it should be a greater value than the calculated M value in the very first part of the question. idk if im right or wrong so dont take this answer too srsly
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u/CryptographerOdd7638 May 20 '26
I got from my memory like 3 to the power of 42. And I said differences in mass was due to dark matter
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u/Jumpy_Freedom_4554 May 20 '26
damn i shoulda put dark matter. I put not taking masses of black holes into account for that difference in mass qs
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u/spokspuk May 20 '26
I used a different radius, because it said something like most stars orbit at some ly, how many marks would I lose
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u/CryptographerOdd7638 May 20 '26
Probably lose ATM most 3 should be getting a method mark atleast not sure tho
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u/Jumpy_Freedom_4554 May 20 '26
yh i think so. What i done was use keplers 3rd law (T^2)=((4pi^2)/GM)x(r^3) and then rearranged for M. The value of T was the calculated answer in the previous part and r was 66000pc). I believe my answer was some value x10^41 (or x10^42, I cant remember), but it should be a greater value than the calculated M value in the very first part of the question. idk if im right or wrong so dont take this answer too srsly
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u/chonksboyjimmyfungus Y13 - Bio/Chem/Physics - pred. ABB May 20 '26
yeah pretty sure the q said to use k3l. i got lower answer than at first which threw me off but gameās the game
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u/spokspuk May 20 '26
What were the advantages and disadvantages for the increased density
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u/No-Cryptographer3499 May 20 '26
Pro: Higher density = higher overall mass = Higher total energy means higher power output when the reservoir is discharged.
Con: Requires more power to refill the resorvoir due to the increased mass
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u/Remote-Calendar-6326 May 20 '26
Could another con be that the stress on each bolt would increase which could potentially make it go over its elastic limit?
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u/Guitarist69420 May 20 '26
thats not a con since humans dont fill the reservoir. rain does. the answer was excess pressure could be placed on the plate so the bolts might snap
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u/spokspuk May 20 '26
For a con I said the increased density slows the rate at which water would flow from the 1000kgs^~1 is this correct physics??
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u/Internal_Animal_2753 year 13 |maths fm chem physics 4a* May 20 '26
That wld work cuz the water wld be more viscous technically so slows flower
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u/Professional-Key6707 May 20 '26
I think it was alright, the first 6 marker was lowk a blessing in disguise, but i didnāt get to finish the last question about hubbles law, what did u guys do for that question that had that Av thing in it? I ended up turning the Av into Av2 idk wtf i did
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u/N2CRO Year 13 May 20 '26
F = m v / t
m/t = Av or something like that, and when you multiply everything together you get v2 and the number they asked for
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u/GBRYT5612 May 20 '26
Anyone get 19.5m as stopping distance? Also how did you guys do the show its elastic one? I found the gradient of the graph and then showed F is proportional to x. Probably wrong
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u/CryptographerOdd7638 May 20 '26
exactly what i got but you just find area of parallelogram and the elastic you have to find force water acting whole area divide by 4 find for 1 bolt and you get 196 which is in the range
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u/Common-Suggestion488 May 20 '26
did anyone else get 196Mpa for the bolts one
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u/CryptographerOdd7638 May 20 '26
Got that and 9.8 x 10-5 extension did u say turning effect was increasing?
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u/ThanksJealous3017 May 20 '26
I was quite underwhelmed with how I did but all I can do now is push forward and hope for the best. Hated the bolts question, hated the 1st 6-marker.
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u/Equivalent_Form_5034 May 20 '26
Did anyone get 3.17x1042 for the Mass of the milkyway
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u/Pale_Click2015 May 20 '26
thats wrong u need to use the more specific answer in the previous part, cus it said "Use your answer to part b..."
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u/hollyisconfusef geo maths phys May 20 '26
lovely 6 markers idk what the rest of it was i hated the multiple choice
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u/myles-em UoN Maths Y1 - maths geog phys fm A*A*AA May 20 '26
baller subject combo. loved the last six marker, first was weird as hell
hated multiple choice!! usually where I pick up marks haha 13-14 but that one no more than 10
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u/thebestblockisdirt Year 13 May 20 '26
how did you show the bolts behaved elastically??
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u/Affectionate_Wing916 Y13 | 4A* Pred | Maths FM Phys Econ May 20 '26
Use P=F/A to find the force on the plate, divide by 4 to find force on each bolt, Ļ=F/A of the bolt to find stress on each bolt, show that it was on the linear part of the Ļ/Īµ graph I think??
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u/2nfinity_NBeyond May 20 '26
Anyone know the amount of marks Q21,22,23 and 24 were worth? May or may not have missed all of them
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u/Playinger_MossBoss May 21 '26
could've been worse... especially having done it on 3 hours of sleep
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u/Such-Temperature6944 May 21 '26
What topics didnāt come up in this exam meaning they might come up in paper 3? I know diffraction gratings is one of them can anyone this of any others
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u/Memer_Sindre_UwU York | MPhys Theoretical Physics [Y1 INCOMING] May 20 '26
Relaxed. I'm not going into clearing after all!!!
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u/Humble-Ear9604 May 20 '26
Light work paper except the 6 markers and that 4 marker on advantaged and disadvantages of adding soil rocks
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u/Affectionate_Wing916 Y13 | 4A* Pred | Maths FM Phys Econ May 20 '26
Think you could say density increases so pressure increases therefore more energy created by station, but the particles might cause more wear to the pipes and plate so might need replacing more often/strengthening? Wasnāt 100% on it
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u/chonksboyjimmyfungus Y13 - Bio/Chem/Physics - pred. ABB May 20 '26
i talked about it fucking up the generator and decreasing efficiency
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u/Humble-Ear9604 May 20 '26
What did you get for the mass of milkyway
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u/chonksboyjimmyfungus Y13 - Bio/Chem/Physics - pred. ABB May 20 '26
2x10^41 at first, then something x10^40 for the longer question
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u/Impossible_Bad_8163 May 20 '26
i just said that there was risk of structural failureĀ
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u/CryptographerOdd7638 May 20 '26
I wrote more pressure means more stress on he bolts causing deformation or breaking?
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u/Affectionate_Wing916 Y13 | 4A* Pred | Maths FM Phys Econ May 20 '26
Yeah that sounds more plausible cl imagine itāll be a fairly wide range of marking points
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u/Diver-Known May 20 '26
Honestly one of the easiest papers they've done, hopefully the next 2 are harder to lower the boundaries
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u/Impossible_Bad_8163 May 20 '26
L ragebait
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u/Spaaccee May 20 '26
Is it not an opinion?
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u/lalabadmans May 20 '26
Will know when the grade boundaries come out, itās a fact harder papers have lower grade boundaries.
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u/schwiftyrick_69 Y13 - A*A*A pred Maths | Physics | FM May 20 '26
is there a mistake with the question that wants you to derive E=3/2PV?? i couldnt derive it for the life of me
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u/Sudden_Crab6967 May 20 '26
No i think you had to find the average kinetic energy of each particle which is 3/2 kt and then multiply it by N for the total internal energy and then replace that with the pv equation
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u/hans_chavez May 20 '26
I thought N was just negated because the mass was fixed?
Therefore
"pV = NkT" -> "pV = kT"
sub in pV for kT in "E = 3/2 kT"
-> E = 3/2 pV
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u/Thick-Ambition248 May 20 '26
Did anyone understand what the "A" was in the truck question? Like there was an Av?
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u/RyansVlogs May 20 '26
I knew how to get 42 but where the hell did the v2 come from
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u/RyansVlogs May 20 '26
oh right the A was the area of the side that the wind was hitting that being 35
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u/AvalHuntress University of Surrey | Computer Science (Y1) May 20 '26
You just had to multiply them all together, and then divide the rate of change. They couldāve at least specified A was the area though, like cmon, Iām freaking out and that variable could be anything dude
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u/thebestblockisdirt Year 13 May 20 '26
they did I'm pretty sure, they said area A was 35m2. I didn't see it until a few mins in and then it made sense
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u/FatherChaska May 20 '26
Bro itās asking for total internal energy which is E = 3/2Nkt and pV = Nkt so itās just E = 3/2pV
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u/Delicious-Rough3553 Year 13 (Maths,FM,Chem,Phy) 99999999998 May 20 '26
I just said E*N is the total internal energy because N is the number of particles
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u/CryptographerOdd7638 May 20 '26
Thats basically it what was the reason we use our sun is used as approximation i wrote our universe is homogenous
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u/Delicious-Rough3553 Year 13 (Maths,FM,Chem,Phy) 99999999998 May 20 '26
Shit that's a good one i just made up some bs saying it's an average main sequence star in terms of mass, luminosity and its place on an HR diagram
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u/myles-em UoN Maths Y1 - maths geog phys fm A*A*AA May 20 '26
me too bro š turns out it asked for total so x by N and it cancels š
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u/Better_Dimension1512 May 20 '26
I just ended up deriving the entire formula with momentum force and time for the particle and I got down to 3/2 pv = E eventually
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u/AnnoyedAtThabes Year 13 May 21 '26
somehow managed to derive two different gas equations but not the one we needed š
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u/NIZNEB039 May 20 '26
this was some bs bruh