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

OP

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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Reply 2281

Original post by CD223

Great! Thank you :smile:

really should have got that one >.<

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It's cool man :smile:

. True, but this happens to me too

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Reply 2282

OP

Original post by Mehrdad jafari

It's cool man :smile:

. 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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Reply 2283

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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Reply 2284

OP

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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Reply 2285

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!

Reply 2286

OP

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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Reply 2287

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!

Reply 2288

OP

Original post by Adangu

Aye I hope so too!

What do you think it will be on?

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Reply 2289

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?

Reply 2290

OP

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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Reply 2291

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?

Reply 2292

OP

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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Reply 2293

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 :smile:

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Reply 2294

OP

Original post by Mehrdad jafari

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

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Thanks! Gotta make up for the EMPA somehow!

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Reply 2295

OP

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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Reply 2296

Lau14

11

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?).

Reply 2297

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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Reply 2298

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!

Reply 2299