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

1. (Original post by maary)
hi - sorry but is there any way you could also post one for transformers and the whole electromagnets thing and earthing? because I tried to go on but its trying to charge me???

Hi

Yeah he charges for Units 2 and 3 now.
Here you go:

https://goo.gl/k1NgvU

Good luck
2. (Original post by TrueDAN)
Good luck everyone!
Remember the comparisons between the eye and the camera - could be a potential six marker too!

Camera:
- Converging lens with a fixed focus
- Brightness controlled by diaphragm and aperture
- Focus achieved by varying lens position
- image formed on CCD/film

Eye:
- Converging lens with a variable focus
- Brightness controlled by pupil and iris
- Focus achieved by ciliary muscle contractions
- image formed on retina

Image made by both of them is Real, Inverted and Diminished (just remember RID)

Potential 4-6 marker could be how is an ultrasound image formed:

- Ultrasound waves are partially reflected when they reach different media
- Time taken for reflected waves to reach detector is measured
- Each boundary distance is measured
- Image is formed

Potential 4- 6marker could be how a smoke alarm works

- Uses Alpha
- Long Half life
- Ionises the air
- Which allows a current to flow
- Smoke absorbs particles
- Which triggers the alarm

Just some extra little facts:
- Principle Focus is the point where the Rays meet
- Focal length is he distance between the lens on principle focus
- The focal length depends on the refractive index of the material of a lens and the curvature of the lens.
- If in doubt on a graph question requiring a calculation, do the vertical line divide horizontal line
- Remember the circuit symbols and the graphs for LDRs, Thermistors, Lamp, Diode and thermistor.
Thank you so so so much for this!
3. (Original post by harryleavey)
No we don't

Here is the specification:

http://filestore.aqa.org.uk/subjects...YS-W-SP-14.PDF
Okay phew, sorry, it was mentioned in the spec
4. there was A level knowlege on the six markers in biology :/
5. (Original post by harryleavey)
Hi

Yeah he charges for Units 2 and 3 now.
Here you go:

https://goo.gl/k1NgvU

Good luck
bless you thank you so much!!!
good luck too
6. (Original post by angellll)
Okay phew, sorry, it was mentioned in the spec
I can't see it in the spec...?
7. (Original post by harryleavey)
I can't see it in the spec...?
It just says: Candidates should be able to discuss the transfer of kinetic energy in particular situations. Examples may include shuttle re-entry or meteorites burning up in the atmosphere.

I'm sure we don't need to know about them though.
8. Would anyone want me to post my revision notes for the Life Cycle of Stars?
9. (Original post by angellll)
It just says: Candidates should be able to discuss the transfer of kinetic energy in particular situations. Examples may include shuttle re-entry or meteorites burning up in the atmosphere.

I'm sure we don't need to know about them though.
Oh ok
10. (Original post by angellll)
It just says: Candidates should be able to discuss the transfer of kinetic energy in particular situations. Examples may include shuttle re-entry or meteorites burning up in the atmosphere.

I'm sure we don't need to know about them though.
In the event that a question like that does come up, what could we write to get the marks?

First thing that this statement screams to me if the conversion of kinetic energy into thermal and sound energy as the speed of the object increases.

And it's being converted as Gravity (weight) is pulling the object towards the centre of the Earth. And in the opposite direction Air Resistance is acting on the object.
11. Hi, can someone tell me the advantages and disadvantages for: x-rays, ultrasound and step-up and step down transformers please...I don't know why, I just have a feeling I need to know this, thanks
12. anyone got particular resources on the motor effect, electromagnets and pretty much everything in that section
13. Do u hve unoffical markshme for p2 and p3 physics 2015
Anyone!!!
14. (Original post by sagepreman123)
Do u hve unoffical markshme for p2 and p3 physics 2015
Anyone!!!
We haven't even done the paper yet! How would anyone know what is in it?
😁
15. I have a feeling the 6 markers will be advantages and disadvantages of things as it has been for other sciences or an experiment - What could that be for p2 like what can be advantages and disadvantages and apart from hooks law what other experiments?x
16. (Original post by t.thompson22)
Would anyone want me to post my revision notes for the Life Cycle of Stars?

Posted from TSR Mobile

17. its probably
going to be lfe cycle of stars
18. who even make the unoffical markschem
19. (Original post by zc555)
Hi, can someone tell me the advantages and disadvantages for: x-rays, ultrasound and step-up and step down transformers please...I don't know why, I just have a feeling I need to know this, thanks

Posted from TSR Mobile

X-Rays: less radiation thag ct, cheaper but produces 2D image and can only detect bone and metal not any soft/hard tissues

CT Scans: 3D image, detects soft and hard tissue but is expensive and more dose of radiation used

Ultrasound: Non ionising, therefore safe for babies, detects soft and hard tissues but image is blurry
20. (Original post by sagepreman123)
who even make the unoffical markschem
Whoever can be bothered. 😅😒

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