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AQA Physics GCSE P2 & P3 [OFFICIAL THREAD]

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Reply 240

KristaWinchester

What topics does anyone thing will come up? (Esp. the 6 markers!)

Reply 241

varun1212

Original post by KristaWinchester

What topics does anyone thing will come up? (Esp. the 6 markers!)

Could be on describing elasticity in terms of energy changes
Could be about Nuclear fission and fusion (hopefully)
May be how safety features work
Isotopes and Medical tracers

Reply 242

11Jason11

The 6 markers for all the other years across all 3 sciences seems so simple (in terms of context). This year they are giving us so many explain and describe 6 markers

Reply 243

SophieeH2

I'm really worried for these tests..physics is currently my let down subject..do you think I could still get an A if my ISA was a C? I did appallingly I have no idea why. If so, what would I roughly need ?

Reply 244

manishahjee

HVe you guys got any notes for p2
I don't have any and I lost my revision guide. Thanks.

Reply 245

kassy12324

What's the difference between the motor effect and electromagnetic induction?I'm so confused

Reply 246

electrahearts

what kind of questions would we get on mains/current electricity? it's probably my weakest area of P2

Reply 247

grovyle

keep on procrastinating on physics revision...
can someone explain refractive index, refraction and incident rays? our teacher didn't explain it well to us and i'm struggling :c

Reply 248

Hxzel

I hate physics so much I'm so glad I'm not doing it next year

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Reply 249

sabaresh

True, this pattern has been repeated for years so i'm pretty sure that the 5 mark question at the end will be about stars of even it could be for a 6 mark.

Reply 250

Hxzel

Original post by kassy12324

What's the difference between the motor effect and electromagnetic induction?I'm so confused

https://answers.yahoo.com/question/index?qid=20080608041030AAN1gNY

I tried to type out an explanation but I found this which is much better than any of my attempts

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Reply 251

science_geeks

A battery which has run down is recharged in 8 hours. The average current delivered by the battery charger is 1.5 A.

Equation is: charge= current X time

Use the equation in the box to calculate the maximum charge stored by both batteries.Show clearly how you work out your answer and give the unit.

I don't understand this question can someone please explain this to me? Much appreciated 😊😊

Reply 252

electrahearts

Original post by science_geeks

I think you have to convert hours to seconds so 60 X 60 = 3600 (1 hour)
3600 X 8 = 28,800
1.5 X 28,800 = 43200 Coulombs? I have a feeling I might be wrong lmao

Reply 253

physicsamor

Once Physics is over I get rid of additional science woo! (although I'm doing physics next year XD)

does anyone have any ways of trying to learn the star cycle, it just won't stick ;-;

Reply 254

Muhammad Shafi

Original post by physicsamor

Once Physics is over I get rid of additional science woo! (although I'm doing physics next year XD)

does anyone have any ways of trying to learn the star cycle, it just won't stick ;-;

http://www.bbc.co.uk/schools/gcsebitesize/science/add_aqa/stars/lifecyclestarsrev1.shtml

Reply 255

Muhammad Shafi

The life of a star
Stars start off in the same way, but their end depends on how much mass they have.

Step 1:Gravitational attraction pulls hydrogen atoms together. The initial star will be big and cold. As it pulls its mass closer together, the hydrogen atoms will start to fuse together to make helium atoms. This is called nuclear fusion. A huge amount of energy is released during nuclear fusion, compared with a chemical reaction. (Don't confuse this reaction with nuclear fission, which they use to generate electricity.)

Step 2:The star will settle down into middle age. The outward pressure, caused by the highly energetic nuclear reactions taking place in the star, just cancels out the gravitational attraction pulling the star in on itself. A star spends most of its lifetime like this. Our sun is at this stage in its development.

Step 3:Eventually, the hydrogen in the star is used up. When this happens, the star starts to collapse under its own gravitational attraction.There is no longer enough outward pressure from nuclear reactions to stop the star collapsing, this causes the star to become unstable.A sudden surge of radiation is emitted, which causes the star to expand massively.This will happen to our Sun in about 5 billion years time - it will then expand to the orbit of Mars.The Star is now a red giant. It will stay like this for a long time with helium nuclei joining together to make heavier elements.What happens next depends on how heavy the star is.

Life of low mass stars
Once helium fusion has stopped, the core of the star will collapse under its gravitational attraction. The outer layers are thrown outwards to form something called a planetary nebula.The core of the star shrinks until it becomes something known as a white dwarf star.

Life of large mass stars
These stars have shorter life spans than smaller stars. They become red giants very quickly (in fact, they are called red super giants because they are so big).When they explode, they cause a supernova
The collapsed core will either form a neutron star - where the gravitational attraction has pulled everything together so much all the particles have turned in to neutrons, or a black hole - which is so dense, even light can not escape from its gravitational field. Neutron stars are formed if the star's mass is between 1½ and 3 times the mass of our sun. A black hole is formed if the star's mass is over 3 times the mass of our Sun.

(edited 8 years ago)

Reply 256

science_geeks

Original post by electrahearts

I think you have to convert hours to seconds so 60 X 60 = 3600 (1 hour)
3600 X 8 = 28,800
1.5 X 28,800 = 43200 Coulombs? I have a feeling I might be wrong lmao

thats exactly how I started off! But the mark scheme says the answer is 86400? I have no idea how they go that'!

Reply 257

Muhammad Shafi

Original post by science_geeks

thats exactly how I started off! But the mark scheme says the answer is 86400? I have no idea how they go that'!

looks like the answer was doubled

Reply 258

t.thompson22

Can someone explain to me the differences and actions of a RCCB in comparison to a Fuse? In return I will help anyone on the Life Cycle of a Star as that's my favourite topic :biggrin:

Reply 259

maxjackson5

Original post by t.thompson22

Can someone explain to me the differences and actions of a RCCB in comparison to a Fuse? In return I will help anyone on the Life Cycle of a Star as that's my favourite topic :biggrin:

RCCB's detect a difference in current between the live wire and neutral wire and this trips a switch to break the circuit and turn the current off. This happens quickly.

When the current gets to high, the fuse will melt and break the circuit and turn the current off. This is much slower and fuses can't be reset.