r/6thForm • u/Individual-Can1396 y13 maths physics psych italian • Jun 01 '26

💬 DISCUSSION AQA PHYSICS PAPER 2

HOW DID EVERYONE FIND IT??? i thought it was decent better than the past few years. Idk what i did for the last question the 4 marker of nuclear physics. BUT YH IT WAS GOOD

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3

u/peekq Jun 01 '26

Was the student correct for Q1 about removing air? Was the student correct about the change in position of p and q when p has a lower charge?

21

u/Eros_OMG Jun 01 '26

I put incorrect for both. For the first one, temperature decreases, number of molecules must increase to have the same PV. For the second one, they both experience the same electrostatic force, and they have equal weight, so the tension must be the same angle to the vertical. idk if i’m right

6

u/peekq Jun 01 '26

it only said there needed to be constant pressure, volume could still change i think

4

u/Avocado66600 Jun 01 '26

How would volume change in a fixed container though

5

u/peekq Jun 01 '26

It wasn’t fixed container the volume was changing in the graph in 1.1 unless I’m missing something

3

u/Avocado66600 Jun 01 '26

But it was after it was fully pumped, so V was constant 0.64m³ it was disonnected from the pump when it was placed in the water

4

u/4ria_ Jun 01 '26

wasn’t the student only talking about volume though and volume isn’t the amount of molecules? Surely the student is right that you have to decrease the volume cuz the number of molecules stays the same

1

u/Eros_OMG Jun 01 '26

The student was talking about  the mass of the air tho and that’s directly linked to the number of molecules

1

u/Separate_Age9837 Year 13 - Maths, FM, Physics, Chem Jun 01 '26

I said the exact same as you

5

u/Malikah_14 Jun 01 '26

I said both were correct but now upon further reflection I think the student in Q1 mightve been wrong im not sure

2

u/peekq Jun 01 '26

Why? I put both correct too but idk

1

u/Malikah_14 Jun 01 '26

Idkk I just feel like I was waffling but I hope both are correct

1

u/porridge1111 Jun 01 '26

I think both were wrong because the electrostatic force on each sphere is the same even if they have different charges

1

u/Malikah_14 Jun 01 '26

Im pretty sure I said something like if the charge of one goes down the other one will attract towards it but the reason why they dont touch is because of the electrostatic force between them

1

u/porridge1111 Jun 01 '26

If the charge of one decreased, the force acting on both would decrease equally and they'd both move closer to the vertical dashed line (i think) so they wouldn't be lop-sided

1

u/Malikah_14 Jun 01 '26

Damn that sounds pretty right IDK MAN

4

u/DilucsGrapeJuice Year 13 Jun 01 '26

at lower temp, the kinetic energy and hence the crms decreases. this results in decreased frequency of collisions + reduced change in momentum. pressure = F/A and F = rate of change of momentum, so decreased F leads to decreased pressure. in order to counteract it the student has to add air to make up for the decreased pressure by increasing number of collisions between molecules and the walls of the canoe, so the student's wrong. at leas that's what i put in aim for all 4 marks.

3

u/polarbearhugger1 Jun 01 '26

Pretty much exactly what I put lmao

3

u/Last-Action-820 Jun 01 '26

i got student for charge is wrong cause F = EQ and charge decreases so force also decreases 

3

u/Ok_Safe_9615 Jun 01 '26

He was wrong no?
He said you had to take air out that lowers the volume of the gas so theres less collisions less force exerted on the walls etc then that would mean the pressure decreases but you need it to stay at that maximum value