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AQA Physics PHYA4 - Thursday 11th June 2015 [Exam Discussion Thread] Watch

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    (Original post by Adangu)
    AQA are just the best (¬_¬)
    I reckon this year's paper will be hard. Especially the written part :/


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    (Original post by CD223)
    Great! Thank you really should have got that one >.<


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    It's cool man . True, but this happens to me too


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    (Original post by Mehrdad jafari)
    It's cool man . True, but this happens to me too


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    Must happen to everyone! Gonna try and redo the written section to each paper again. Had quite a lot of practice with MC, but I always lose so many marks in the written.


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    (Original post by CD223)
    Must happen to everyone! Gonna try and redo the written section to each paper again. Had quite a lot of practice with MC, but I always lose so many marks in the written.


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    That's really good. Unfortunately i don't have enough time otherwise i would do the same.
    With the written part you just have to be careful with the mark scheme, take advantage of their points.


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    (Original post by Mehrdad jafari)
    That's really good. Unfortunately i don't have enough time otherwise i would do the same.
    With the written part you just have to be careful with the mark scheme, take advantage of their points.


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    Yeah! I'll probably just gloss over mark schemes rather than physically do the paper in timed conditions haha.


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    (Original post by CD223)
    I reckon this year's paper will be hard. Especially the written part :/


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    Really? I have a feeling that it will be slightly harder than average with regards to the multiple choice.

    Hope that's not true about the written bit, that's where I try to get my marks!
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    (Original post by Adangu)
    Really? I have a feeling that it will be slightly harder than average with regards to the multiple choice.

    Hope that's not true about the written bit, that's where I try to get my marks!
    Lol the written is where I lose so many -.- praying the 6 marker is doable. It's make or break really.


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    (Original post by CD223)
    Lol the written is where I lose so many -.- praying the 6 marker is doable. It's make or break really.


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    Aye I hope so too!
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    (Original post by Adangu)
    Aye I hope so too!
    What do you think it will be on?


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    (Original post by CD223)
    What do you think it will be on?


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    Transformers, magnetic fields or one that involves mechanics.

    The gravity ones are always easy but, they came up pretty recently so I doubt AQA would put one on that.

    What do you think?
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    (Original post by Adangu)
    Transformers, magnetic fields or one that involves mechanics.

    The gravity ones are always easy but, they came up pretty recently so I doubt AQA would put one on that.

    What do you think?
    Hmm, interesting! I was thinking Simple Harmonic, or Circular Motion as I've not seen one on that topic at all!


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    (Original post by CD223)
    Hmm, interesting! I was thinking Simple Harmonic, or Circular Motion as I've not seen one on that topic at all!


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    Not a fan of SHM must admit. I think circular motion is just usually a maths question isn't it, I'm wondering what they could ask then?
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    (Original post by Adangu)
    Not a fan of SHM must admit. I think circular motion is just usually a maths question isn't it, I'm wondering what they could ask then?
    In recent years they've bullet pointed exactly what we have to say.

    With circular motion they could give us an application such as a vertical circle and we would describe how the centripetal force changes in terms of what makes it up (T-mg or mg-T etc) and things like whether work is done/what does and doesn't change and the direction of the velocity/displacement/acceleration in relation to the motion.

    SHM could be an experiment with a pendulum or mass spring system like the EMPA.


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    (Original post by CD223)
    Yeah! I'll probably just gloss over mark schemes rather than physically do the paper in timed conditions haha.


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    Good luck man. Hopefully everybody will be fine with the exams


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    (Original post by Mehrdad jafari)
    Good luck man. Hopefully everybody will be fine with the exams


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    Thanks! Gotta make up for the EMPA somehow!


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    How does everyone tend to tackle questions like June 2013 MC Q11?

    Calculating the field strength (as the force isn't given)?


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    (Original post by CD223)
    How does everyone tend to tackle questions like June 2013 MC Q11?

    Calculating the field strength (as the force isn't given)?


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    I'll admit I guessed (and got it wrong!) first time round.
    But you're looking at M/r^2 (as the mass of the satellite is the same for all of them, and G is a constant). You can assume distance from Earth to Moon and Earth to Sun to be the same as satellite to Moon and Sun, as it's in low orbit. Calculate M/r^2 for the moon and sun - the sun's is biggest so FS > FM. Then it's so close to the Earth that the Earth's must be largest (or Earth's must be largest for circular motion to happen, otherwise it would be pulled away I think?).
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    (Original post by CD223)
    How does everyone tend to tackle questions like June 2013 MC Q11?

    Calculating the field strength (as the force isn't given)?


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    That question is very intuitive. I think it would better to think about it logically than mathematically, in terms of what's causing the orbits in the first place. So if the space shuttle is in orbit, it's in orbit around the earth "first". Then the earth along with the space shuttle are in orbit around the sun and then along with the moon. Therefore the force exerted by the earth should be greater ( because if the space shuttle were not to orbit it would fall towards the earth and not towards the moon or the sun). Then the force exerted by the sun should be next because the earth and the space shuttle are both in orbit around the sun( because if the earth were not to orbit it would fall, along with the space shuttle, towards the sun). And then moon comes last because moon is in orbit itself around the earth


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    (Original post by CD223)
    How does everyone tend to tackle questions like June 2013 MC Q11?

    Calculating the field strength (as the force isn't given)?


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    i just thought realistically what would it be and picked A.

    My teacher went and worked it out and it was A.

    So could you use g=GM/r^2 ?
    and then F=mg?

    Sorry i have no clue, I just used common sense really, although not reliable it did save me a lot of time when doing the paper as 1-2 minutes is a lot when you think about it!
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    (Original post by Lau14)
    I'll admit I guessed (and got it wrong!) first time round.
    But you're looking at M/r^2 (as the mass of the satellite is the same for all of them, and G is a constant). You can assume distance from Earth to Moon and Earth to Sun to be the same as satellite to Moon and Sun, as it's in low orbit. Calculate M/r^2 for the moon and sun - the sun's is biggest so FS > FM. Then it's so close to the Earth that the Earth's must be largest (or Earth's must be largest for circular motion to happen, otherwise it would be pulled away I think?).
    Yeah, that would make it exact


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