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# AQA Physics GCSE P2 & P3 [OFFICIAL THREAD] watch

1. When a current flows through a wire a magneticfield is produced around the wire.The motor effect and its use.The size of the force can be increased by:increasing the strength of the magnetic fieldincreasing the size of the current. the conductor will not experience a force if it isparallel to the magnetic field.The direction of the force is reversed if either thedirection of the current or the direction of themagnetic field is reversed.
2. Anyone want some quick fire questions?
3. Anyone want some quick short answer questions, like a quiz?
4. (Original post by 11Jason11)
Anyone want some quick fire questions?
Sure thang
5. (Original post by 11Jason11)
Anyone want some quick short answer questions, like a quiz?
How would you answer a 6 mark motor effect question ? I know what it is but i cant get my head around how you would do so many points for it .
6. Please can someone explain to me the whole electrical circuits jobby??

I don't understand what current, potential difference, resistance, power and charge all mean?
Also I don't understand the current potential difference graphs...

Thank you :-D
7. (Original post by saahil0987)
Sure thang
Question 1. What is the unit of power (when relating to focal length)?
8. (Original post by MrTechGamer)
How would you answer a 6 mark motor effect question ? I know what it is but i cant get my head around how you would do so many points for it .
It was in a past paper I think, I'll link it for ya
9. like that?
(Original post by MrTechGamer)
How would you answer a 6 mark motor effect question ? I know what it is but i cant get my head around how you would do so many points for it .
10. (Original post by saahil0987)
It was in a past paper I think, I'll link it for ya
Thanks bro
11. (Original post by MrTechGamer)
Thanks bro

http://filestore.aqa.org.uk/subjects...S-W-SQP-3H.PDF (Question)

Question 3
12. (Original post by 11Jason11)
like that?
yea that one i think !
13. (Original post by MrTechGamer)
yea that one i think !
That's a transformer?
14. (Original post by MrTechGamer)
yea that one i think !
An alternating current or p.d. in the primary coil creates a changing / alternating magnetic field [1 mark]

in the iron core [1 mark]

(and so) an alternating p.d. or alternating voltage [1 mark]

is induced across secondary coil. [1 mark]

4 marks right there
15. (Original post by 11Jason11)
An alternating current or p.d. in the primary coil creates a changing / alternating magnetic field [1 mark]

in the iron core [1 mark]

(and so) an alternating p.d. or alternating voltage [1 mark]

is induced across secondary coil. [1 mark]

4 marks right there
What year was that paper?
16. (Original post by saahil0987)
What year was that paper?
It's not a paper, it's MyGCSEscience, although you would require a subscription yo access the questions/papers he provides
17. (Original post by 11Jason11)
It's not a paper, it's MyGCSEscience, although you would require a subscription yo access the questions/papers he provides
Oh right
18. Anyone have predicted questions for P2?
19. (Original post by electrahearts)
Hi would you be able to explain how to answer a 6 marker on the life cycle of stars? If you could I'd be grateful forever haha
So they could ask you two kinds of questions. The life cycle of a star BIGGER than the sun and the life cycle of a star the SAME size of the sun. I'll list the name classifications of each stage for you first, starting from when the star is born.

Star BIGGER than the Sun

1. Protostar
2. Main Sequence Star
3. Red Super Giant
4. Supernova
5. Neutron Star / Black Hole

Star the SAME size of the sun

1. Protostar
2. Main Sequence Star
3. Red Giant
4. White Dwarf ->> Black Dwarf

• A Protostar is made up of clouds of dust and gas spiralled in together from the force of gravity. Then gravitational energy is converted to thermal energy to form a Main Sequence Star.

• A main sequence star is currently the stage our own sun is in! It undergoes Nuclear FUSION to form helium. It's stable, meaning that the outward pressure balances with the force of gravity. It produces lots and lots of Hydrogen!

• Eventually the hydrogen runs out and elements such as IRON are made by nuclear FUSION If it's a small star, it'll turn into a Red Giant but if it's a bit star then it'll turn into a Red Super Giant! It becomes red as the surface "cools."

• If it's a Red Super Giant, it'll then explode into a Supernova. Again, using nuclear reactions to produce elements as heavy as Iron. It ejects these elements into the universe to form new planets and stars! That's how our earth was formed!

• A White Dwarf is basically just a very dense core of dust and gas. This will eventually cool down to a Black Dwarf. This is the same for a Neutron Star, it's just a very dense core. And IF the Neutron Star is big enough, it'll form a Black Hole.

A lot to take in but you don't have to memorise it all for a 6 marker! It's just good to know the names of the stages and some key information behind each.

Hope this helps!
20. Do we need to know about the discovery of the nucleus for P2?

It is not in the spec but it is in the text book....

And I mean like the plum pudding model and all that jazz

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