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# AQA GCSE Physics Unit 2 and 3 (20th May) watch

1. (Original post by GenuineHpLaptop)
PUT DOWN"!! but i have no idea it didint show the direction of current!!!
In P3, the current goes from positive (the longest line in the cell) to the negative which went in the "right" direction. Therefore, using the left hand rule, the movement of force had to go upwards.
2. the resistance line, first q in p2, wasn't it the line C, because it had least current allowing thru it, hence bigger resistance
3. (Original post by ArcticNeighbour)
It is not possible to predict grade boundaries at all. It's based on the whole country's performance and intended difficulty.
Of course it is, you can roughly figure out what they will be based on how hard you found it and others found it and what they have been in the past. I have done many past papers so feel my instincts are right
4. What did people get for the rocket velocity? I got decreases because there was no upward force, only the weight and the air resistance down?
5. (Original post by WhiteScythe)
These are some provisional predictions:

P2: 48/49 A* (54 = 100 UMS)
P3: 44/45 A* (51 = 100 UMS)

C2: 49/50 A* (55 = 100 UMS)
C3: 45/46 A* (49 = 100 UMS)

B2: 43/44 A* (49 = 100 UMS)
B3: 46/47 A* (51 = 100 UMS)
I agree with biology and chemistry, I would say physics slightly lower because of the calculations so many people would have made mathmatical errors
6. (Original post by emmanuel1999)
I made a mistake on p2 and wrote that proton has a relative mass of +1, and electrons has a relative mass of -1. Will i lose marks
For the electrons, only one make though, may make that up in other areas of he Q
7. (Original post by Amyh141999)
Of course it is, you can roughly figure out what they will be based on how hard you found it and others found it and what they have been in the past. I have done many past papers so feel my instincts are right
No you can't. That was probably just luck
8. What caused the centripetal force? Friction? Gravity? What did you put?
9. Here are some of the answers I got for some questions in P2 and P3, that I am pretty sure are correct:

P2: Conservation of momentum calcs - 5m/s
P2: Half life of the element was 12 years.
P2: Advantages of fusionable fuels: Don't produce radioactive waste that needs to be disposed off (something to that effect), and they produce more energy per Kg - some more could've been said probably - they're hydrogen isotopes, so are renewable and abundant.
P2:51 coulombs for the charge question , and 612Joules for energy transferred
P2: Rocket velocity Q: The graph was B.
P2: rocket velocity increases ?? I mean bit of a vague question, but oh well. Difference between speed & velocity - velocity has a direction, speed does not.
P3: First Q, was 1.25
P3: Refractive index, first glass question was 1.5 something
P3: Second q: 26.18 degrees or 26.2
P3: hydraulics Q: 84000N
P3: bus won't topple as line of action is within the base, and doesn't produce a resulting moment
P3: eye: ciliary muscles & retina - also the critical angle one, the line went straight forward when i = critical angle
P3: 20,000hz for ultrasound, and wavelength = an atom, although i put electron, after I crossed out an atom lol - weird question.
P3: No of coils 18...
P3: Motor effect, and the arrow you had to draw was one going upward toward the top of the page.
P3: Centripetal force: D - could've said, mass of car, radius of circle it is travelling in, or distance from the centre, or speed. - also in this instance it is friction which causes it.
That's all I can remember atm, but all in all, a pretty good paper set by AQA for both P2 and P3. Hope you all did well guys.
P2: Plum pudding is positive
P3: Conditions was short sight - the 60 year olds had a focal length/power or whatever it was of 0.5 metres - you also had to estimate the diopters which was anywhere between 0.6-0.8 probably.
P2: The gravitational and kinetic energy was 3.6 J i think, or was that the braking distance Q idk
10. i put diameter of an atom lol
11. (Original post by Turtlebunny)
Here are some of the answers I got for some questions in P2 and P3, that I am pretty sure are correct:

P2: Conservation of momentum calcs - 5m/s
P2: Half life of the element was 12 years.
P2: Advantages of fusionable fuels: Don't produce radioactive waste that needs to be disposed off (something to that effect), and they produce more energy per Kg - some more could've been said probably - they're hydrogen isotopes, so are renewable and abundant.
P2:51 coulombs for the charge question , and 612Joules for energy transferred
P2: Rocket velocity Q: The graph was B.
P2: rocket velocity increases ?? I mean bit of a vague question, but oh well. Difference between speed & velocity - velocity has a direction, speed does not.
P3: First Q, was 1.25
P3: Refractive index, first glass question was 1.5 something
P3: Second q: 26.18 degrees or 26.2
P3: hydraulics Q: 84000N
P3: bus won't topple as line of action is within the base, and doesn't produce a resulting moment
P3: eye: ciliary muscles & retina - also the critical angle one, the line went straight forward when i = critical angle
P3: 20,000hz for ultrasound, and wavelength = an atom, although i put electron, after I crossed out an atom lol - weird question.
P3: No of coils 18...
P3: Motor effect, and the arrow you had to draw was one going upward toward the top of the page.
P3: Centripetal force: D - could've said, mass of car, radius of circle it is travelling in, or distance from the centre, or speed.
That's all I can remember atm, but all in all, a pretty good paper set by AQA for both P2 and P3. Hope you all did well guys.
Thanks for posting! I agree with everything except the wavelength which should be an atom only because the physics spec says so specifically!
12. (Original post by Turtlebunny)
Here are some of the answers I got for some questions in P2 and P3, that I am pretty sure are correct:

P2: Conservation of momentum calcs - 5m/s
P2: Half life of the element was 12 years.
P2: Advantages of fusionable fuels: Don't produce radioactive waste that needs to be disposed off (something to that effect), and they produce more energy per Kg - some more could've been said probably - they're hydrogen isotopes, so are renewable and abundant.
P2:51 coulombs for the charge question , and 612Joules for energy transferred
P2: Rocket velocity Q: The graph was B.
P2: rocket velocity increases ?? I mean bit of a vague question, but oh well. Difference between speed & velocity - velocity has a direction, speed does not.
P3: First Q, was 1.25
P3: Refractive index, first glass question was 1.5 something
P3: Second q: 26.18 degrees or 26.2
P3: hydraulics Q: 84000N
P3: bus won't topple as line of action is within the base, and doesn't produce a resulting moment
P3: eye: ciliary muscles & retina - also the critical angle one, the line went straight forward when i = critical angle
P3: 20,000hz for ultrasound, and wavelength = an atom, although i put electron, after I crossed out an atom lol - weird question.
P3: No of coils 18...
P3: Motor effect, and the arrow you had to draw was one going upward toward the top of the page.
P3: Centripetal force: D - could've said, mass of car, radius of circle it is travelling in, or distance from the centre, or speed.
That's all I can remember atm, but all in all, a pretty good paper set by AQA for both P2 and P3. Hope you all did well guys.
P2: Plum pudding is positive
bitesize confirms its similar to the diameter of an atom.. idk though
Thanks for posting! I agree with everything except the wavelength which should be an atom only because the physics spec says so specifically!
Yea I think it is an atom, which seems really strange, but oh well, it's only 1 mark.
14. it was not that good this year i hated the paper (not the maths parts though)
15. (Original post by Nabzy8)
bitesize confirms its similar to the diameter of an atom.. idk though
hey the refreaction was in line with the glass, it was on the surface of the glass, when the i = critical angle, its refracted on glass surface
16. (Original post by Nelson Barnaby)
What caused the centripetal force? Friction? Gravity? What did you put?
friction
17. (Original post by Turtlebunny)
Yea I think it is an atom, which seems really strange, but oh well, it's only 1 mark.
hey the refreaction was in line with the glass, it was on the surface of the glass, when the i = critical angle, its refracted on glass surface
18. okee i put friction but just checking what others fought
(Original post by PawanAviator)
friction
19. (Original post by Nelson Barnaby)
okee i put friction but just checking what others fought
great!
20. (Original post by PawanAviator)
great!
correct friction between tyres and the road surface

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