On the multiple choice, Gravitational/Electrical fields and on the written part, probably Electromagnetism(Original post by Brailey)
Hey!
What do you guys find the most challenging in this unit?
As in specifics not just topics,
Cheers!
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AQA Physics PHYA4 - 20th June 2016 [Exam Discussion Thread] watch
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particlestudent
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- 15-06-2016 01:29
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John Fluffy Bunny
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- 15-06-2016 12:36
Does anyone have any tips on how to revise for 6 mark questions? Whenever I attempt a past paper and then look at the mark scheme I'm absolutely baffled by the points that should be included in the answer, they are usually completely irrelevant and don't even make sense. The instructions are very vague so you could go on about different things for hours and still miss the mark scheme points? The latest question that completely caught me off guard was the 6 marker in Jan 2013 paper. They ask you to compare geosynchronous and low polar orbits. The points they included in ms were as follows
-Earth rotates relative to the orbit (why say something quite as obvious? It clearly orbits planet earth 😶)
-Many orbits with different radii and periods are possible (again don't see the point of saying that it's true but not relevant in any way to the question?)
-Satellite scans the whole surface of the Earth (not sure if that's even true they show the orbit in the diagram as fixed above the earth, by any means not an obvious point to make)
Where does any even find information like this to answer that? The textbook only contains a vague description of geostationary satellites...
Sorry for the rant a man had to get all this off his chest. -
particlestudent
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- 15-06-2016 13:14
(Original post by John Fluffy Bunny)
Does anyone have any tips on how to revise for 6 mark questions? Whenever I attempt a past paper and then look at the mark scheme I'm absolutely baffled by the points that should be included in the answer, they are usually completely irrelevant and don't even make sense. The instructions are very vague so you could go on about different things for hours and still miss the mark scheme points? The latest question that completely caught me off guard was the 6 marker in Jan 2013 paper. They ask you to compare geosynchronous and low polar orbits. The points they included in ms were as follows
-Earth rotates relative to the orbit (why say something quite as obvious? It clearly orbits planet earth 😶)
-Many orbits with different radii and periods are possible (again don't see the point of saying that it's true but not relevant in any way to the question?)
-Satellite scans the whole surface of the Earth (not sure if that's even true they show the orbit in the diagram as fixed above the earth, by any means not an obvious point to make)
Where does any even find information like this to answer that? The textbook only contains a vague description of geostationary satellites...
Sorry for the rant a man had to get all this off his chest. -
John Fluffy Bunny
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- 15-06-2016 13:22
(Original post by particlestudent)
I understand what you mean by the first 2 points but the last one is quite essential I think... It is for the low polar orbit right? It rotates about the earth's north and south poles so eventually as it goes north to south, south to north while the earth is spinning, it would have scanned every point of the Earth eventually. It's kind of hard to explain it in words. I think this point is necessary because this is what makes it useful for the jobs it carries out, and a geosynchronous satellite isn't able to do this as it doesn't scan the whole surface.
I really don't like the way knowledge is tested in the exam, even if you make a valid point there's a good chance you won't get the marks because it doesn't overlap with ms. -
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- 15-06-2016 13:33
(Original post by John Fluffy Bunny)
I didn't actually think of it this way, thanks for explaining.
I really don't like the way knowledge is tested in the exam, even if you make a valid point there's a good chance you won't get the marks because it doesn't overlap with ms.
If they included absolutely every point that could receive a mark, the list would be too long, so instead they make it synoptic, presumably -
particlestudent
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- 15-06-2016 14:25
(Original post by John Fluffy Bunny)
I didn't actually think of it this way, thanks for explaining.
I really don't like the way knowledge is tested in the exam, even if you make a valid point there's a good chance you won't get the marks because it doesn't overlap with ms. -
Billsonbubbles
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- 15-06-2016 16:01
Hi all,
I have done a Unit 4 A2 specification video going off what you need to know according to the AQA's website
https://www.youtube.com/playlist?lis...2obL7-dBYZobuo
I have also done some for the AS units 1 and 2 , and I am currently uploading the Unit 5 specification videos
Also I have created some more Past paper style questions if anyone has run out of the standard AQA past papers.
Enjoy !!
Will -
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- 15-06-2016 17:57
https://60abffc9b401b1c0936e01291c15...%20Physics.pdf
Could anyone help me with q15 and q19 from here please.
For q15, I tried working out V when its 1m away from P and 3m from Q. Then I subtracted them to find the resultant(is this the right thing to do?) and I'm not too sure what to do from here.
For q19 I tried using simeltaneous equations, but I dont think this is right, it gets way too complicated.
Thanks -
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- 15-06-2016 18:14
This question only had a facility of 59% -
philo-jitsu
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- 15-06-2016 18:28
And am i beng dumb, it is A right? -
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- 15-06-2016 18:42
Does anyone know where I can find worked answers for the multiple choice section on the exams (PHYA4/1)?
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TrilbyMctip
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- 15-06-2016 19:51
(Original post by boyyo)
https://60abffc9b401b1c0936e01291c15...%20Physics.pdf
Could anyone help me with q15 and q19 from here please.
For q15, I tried working out V when its 1m away from P and 3m from Q. Then I subtracted them to find the resultant(is this the right thing to do?) and I'm not too sure what to do from here.
For q19 I tried using simeltaneous equations, but I dont think this is right, it gets way too complicated.
Thanks
For 19; the energy stored is being quartered when the voltage across is being decreased by 2. this ONLY happens when you halve the voltage across it; meaning that the voltage across the capacitor when it stores 400 microjoules is 2v. Use this with E=0.5*C*V^2 to find the capacitance; 200 microfarads.
I hope this helps. -
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- 15-06-2016 20:15
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philo-jitsu
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- 15-06-2016 20:43
(Original post by MintyMilk)
Facility is the percentage of people who attempted the question who got it right, and yeah it's A. It just seems strange that 41% of people managed not to get it right even though it's probably as common sense as a question gets -
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- 15-06-2016 20:57
(Original post by TrilbyMctip)
For Q.15; Before the distance between the point M and each of the charges was 2m. now; the distance between P and M is 1m and the distance between M and Q is 3m. So, as the relationship between V and r is linear; you can treat this as simple addition. If x/2 + x/2 = 25 then x/1 + x/3 = 33.3v
For 19; the energy stored is being quartered when the voltage across is being decreased by 2. this ONLY happens when you halve the voltage across it; meaning that the voltage across the capacitor when it stores 400 microjoules is 2v. Use this with E=0.5*C*V^2 to find the capacitance; 200 microfarads.
I hope this helps.
Also in 19, when you say the energy stored is being quartered, wouldnt that be the case if it was being halved? Im assuming that when they say decreases by 2, its literally gone down by 2 volts, am I missing something out?
Thank you so much for clearing this up for me -
Billsonbubbles
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- 15-06-2016 21:04
(Original post by dnan)
Does anyone know where I can find worked answers for the multiple choice section on the exams (PHYA4/1)?
But I do some past paper tutorials for the multiple choice questions explaining why each option is chosen etc... and going through each option which does mean of course the videos are fairly long, but do have a look
bills7187 on youtube
Cheers,
Will -
TrilbyMctip
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- 15-06-2016 21:51
(Original post by boyyo)
ahh ok thank you that makes sense. So when you need to find the resultant grav. potential, you add them?
Also in 19, when you say the energy stored is being quartered, wouldnt that be the case if it was being halved? Im assuming that when they say decreases by 2, its literally gone down by 2 volts, am I missing something out?
Thank you so much for clearing this up for me
For 19; The voltage across has decreased by two, but because of the fact (as the question states) that the energy has quartered; the decrease by 2 volts must have also been halving the original Pd across it (or else the Energy would've decreased by some other amount). So; we can deduce from what the question tells us that the pd before was 4v and the pd after must be 2v. -
TrilbyMctip
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- 15-06-2016 22:22
(Original post by TrilbyMctip)
Not necessarily; if at a point halfway between two identical large masses the gravitational potential is X then if you got rid of one of the large masses; the potential would STILL be X. If it is halfway between them, the potential due to each is the same. They don't add together.
For 19; The voltage across has decreased by two, but because of the fact (as the question states) that the energy has quartered; the decrease by 2 volts must have also been halving the original Pd across it (or else the Energy would've decreased by some other amount). So; we can deduce from what the question tells us that the pd before was 4v and the pd after must be 2v.
Please refer to this rather than what i've said in the quote above^ -
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- 15-06-2016 22:25
(Original post by TrilbyMctip)
Not necessarily; if at a point halfway between two identical large masses the gravitational potential is X then if you got rid of one of the large masses; the potential would STILL be X. If it is halfway between them, the potential due to each is the same. They don't add together.
For 19; The voltage across has decreased by two, but because of the fact (as the question states) that the energy has quartered; the decrease by 2 volts must have also been halving the original Pd across it (or else the Energy would've decreased by some other amount). So; we can deduce from what the question tells us that the pd before was 4v and the pd after must be 2v.
Taking your example, of V at X, what about at a point not in the middle? -
¡Muy bien!
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- 16-06-2016 01:28
(Original post by Billsonbubbles)
Also I have created some more Past paper style questions if anyone has run out of the standard AQA past papers.
Where can I get these from?
Thanks
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