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

1. (Original post by PawanAviator)
most likely both
did u do higher?
2. yeh i did higher so did he.

(Original post by JSinha)
did u do higher?
3. People are getting confused about the half life question so i'll explain it quickly.

The radioactive thing went from 80g to 10g. So 80/10= 8.
Since we are talking about half lives here we represent the answer as a power of 2. So 8= 2^3.
Its 2 to the power of 3. So we divide the time taken by three.
36/3=12.

also think of it as this. The first time it halved was when it went from 80 to 40. then 40 to 20 and then 20 to 10. Remember the half live changes in NO circumstances- temperature, concentration etc. do not affect half life. So it halved three times in 36 years with each halving taking equal time. So 36/3=12.
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
Yes, that's what I put. It was a straight line hard to explain, just google it
5. (Original post by Nelson Barnaby)
i dont think so :O

do u mean the one where we had to draw the light where it comes out of the semi circle?
yep
6. (Original post by Turtlebunny)
Yes, that's what I put. It was a straight line hard to explain, just google it
its parallel to surface of glass right
7. What was the bus question again?
8. i used refractive index to calculate angle of line.
is ok though ^_^
it bend away from glass because it travek
9. *becuase it rtravel different speed threw different surface life water glass air etc
(Original post by Nelson Barnaby)
i used refractive index to calculate angle of line.
is ok though ^_^
it bend away from glass because it travek
10. (Original post by neil20143)
What was the bus question again?
hated that
11. (Original post by Nelson Barnaby)
Spoiler:
Show
yeh i got that one wrong too also i said diameter of a tennis ball
oh it was that question
yh i said diameter of an atom. was that right?
12. (Original post by JSinha)
oh it was that question
yh i said diameter of an atom. was that right?
yep was atom!
its parallel to surface of glass right
Yes.
14. (Original post by PawanAviator)
weirdly , i put the velcoty decreases for the rocket. i changed it because it will run out of thrust leaving gravity to decelerate it right? it will also reach terminal velocity?
Its not a real rocket, it was one thrown up by someone, and there was no upward force so i think it is decreasing
15. (Original post by Cal9999)
Its not a real rocket, it was one thrown up by someone, and there was no upward force so i think it is decreasing
hahaha! , i knew it. it would increase if it was real to be honest unless if they said it crashed! ahahahahahh
16. (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:

P3: eye: ciliary muscles & retina - also the critical angle one, the line went straight forward when i = critical angle
Cilary muscles is wrong, it's actually the suspensory ligament. If you look at its position, it connects one side of the lens to the ciliary muscle - it suspends the lens in the eye, hence 'suspensory'.
17. (Original post by jamestg)
Cilary muscles is wrong, it's actually the suspensory ligament. If you look at its position, it connects one side of the lens to the ciliary muscle - it suspends the lens in the eye, hence 'suspensory'.
ye i got ligaments too, it was holding lens in place hence liagments which connectd to CM
18. (Original post by valbrechts)
Past papers are useless this year. Atleast 75% of the questions for Bio and Chem have been language based.
i hate AQA
Oh us ocr 21st century have failed our physics since it was half maths quesions that we had no clue about, i wish that it was mostly language based. u aqa guys are lucky
19. (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 reckon it'll be...

P2 - 46/60 (51 = 100 UMS)
P3 - 48/60 (55 = 100 UMS)

C2 - 48/60 (55 = 100 UMS)
C3 - 46/60 (51 = 100 UMS)

B2 - 42/60 (48 = 100 UMS)
B3 - 44/60 (49 = 100 UMS)
20. The refracted ray in the glass semi-circle diagram, it refracted along the boundary (along the base of the semi circle) as the incidence angle was at critical angle. Who else did the same?

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