OCR Physics A G484 Jan 2012 - The Newtonian World
Physics exam discussion - share revision tips in preparation for GCSE, A Level and other physics exams and discuss how they went afterwards.
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Re: OCR Physics A G484 Jan 2012 - The Newtonian WorldOh right(Original post by shorty.loves.angels)
I've not sat it before. I'm 23
and want an A level in physics so that I have more chance of getting onto teacher training for science... so I'm self teaching the whole course. Today was my first exam 
3 to go and a few practicals!
Ouch. Self teaching physics CANNOT be fun, especially the theoretical stuff. Makes my head spin
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Re: OCR Physics A G484 Jan 2012 - The Newtonian WorldActually, it's brilliant. Moving at your own pace and finding resources that work for you is SO much better, and you have way more motivation/ don't get bored. I did crap at A level maths (all those years ago) because I understood none of the context and had no idea where to go to study in my own way. Now, I've HAD to go out and learn for myself and it's way better.(Original post by wibletg)
Oh right
Ouch. Self teaching physics CANNOT be fun, especially the theoretical stuff. Makes my head spin
Also, physics has put so much A level maths into context that I'm considering re-sitting maths. -
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Re: OCR Physics A G484 Jan 2012 - The Newtonian WorldNiiiiiiice.(Original post by aquark)
For anyone who's interested
% UMS. . . 100 80 70 60 50 40 30
Jun 11 Raw 52 44 40 36 33 30 27
Jan 11 Raw 53 45 41 37 33 29 25
Jun 10 Raw 56 48 44 40 36 33 30
Jan 10 Raw 53 45 41 37 34 31 28
Bit of room for a slip up there
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Re: OCR Physics A G484 Jan 2012 - The Newtonian WorldExcept that with only 14 marks between A and E last year. Thats about 3 marks per grade.
a 3 mark slip-up can be a awhole grade.
The A grade is low 44/60 = 73%
The E grade is high 30/60 = 50%
Its a good paper if you are an A/B student - its not so good if you are a CDE student.
UMS marks get stretched at the top and squashed at the bottom. -
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Re: OCR Physics A G484 Jan 2012 - The Newtonian WorldI have a question:
For the standard SHM graphs (x/v/a), in the book it shows that at T=0s, x=0m and v=Vmax. (2πfA). It also states that at T=0s, KE=0 and PE=max.
Why is this? Surely at max velocity, kinetic energy should be max (as k.e.=0.5mv^2). Similarly, at x=0m, potential energy should be 0 (as gpe=mgh).
Any help would be much appreciated!
Last edited by sweetascandy; 16-01-2012 at 12:23. -
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Re: OCR Physics A G484 Jan 2012 - The Newtonian WorldHmm, never really considered that, bit unfair for them then unless most people pick up enough marks to at least get an E then struggle beyond that?(Original post by teachercol)
Except that with only 14 marks between A and E last year. Thats about 3 marks per grade.
a 3 mark slip-up can be a awhole grade.
The A grade is low 44/60 = 73%
The E grade is high 30/60 = 50%
Its a good paper if you are an A/B student - its not so good if you are a CDE student.
UMS marks get stretched at the top and squashed at the bottom.
How do these things work? -
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Re: OCR Physics A G484 Jan 2012 - The Newtonian WorldWhich book is this and I'll have a look, from what you say I agree with you(Original post by sweetascandy)
I have a question:
For the standard SHM graphs (x/v/a), in the book it shows that at T=0s, x=0m and v=Vmax. (2πfA). It also states that at T=0s, KE=0 and PE=max.
Why is this? Surely at max velocity, kinetic energy should be max (as k.e.=0.5mv^2). Similarly, at x=0m, potential energy should be 0 (as gpe=mgh).
Any help would be much appreciated!
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Re: OCR Physics A G484 Jan 2012 - The Newtonian WorldThe graphs on page 46 and 48 (both are labelled Figure1) from this book.(Original post by wibletg)
Which book is this and I'll have a look, from what you say I agree with you
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Re: OCR Physics A G484 Jan 2012 - The Newtonian WorldHmm. I've had a look in my copy and there's nothing on SHM on page 46 and 48(Original post by sweetascandy)
The graphs on page 46 and 48 (both are labelled Figure1) from this book.
But I'd agree, at the equilibrium position v = max and therefore ke= max. -
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Re: OCR Physics A G484 Jan 2012 - The Newtonian WorldHeat loss - leads to a lower value of delta t if you've used a known time therefore as c is proportional to one over delta t if delta t is smaller then c is larger(Original post by zonka)
What uncertainties are there un the SHC (Solid) experiment
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Re: OCR Physics A G484 Jan 2012 - The Newtonian WorldI've done the brownian motion experiment, but never seen a question/ answer for it. Have you got a link to the key points they're after?(Original post by zonka)
Just wondering if anyone could list all the experiments we need to know. I know the brownian motion, SHC of liquid/solid but what others are there we need to know? -
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Re: OCR Physics A G484 Jan 2012 - The Newtonian WorldI usually judge it by how many are given in the question. It also depends on how much difference it would make to the answer. Practising should clue you up though(Original post by High VOLTAGE)
DOes anybody know how many sf we are supposed to use or if it even matters ? thanks 4 ur help
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Re: OCR Physics A G484 Jan 2012 - The Newtonian WorldUsually 3 sigfig isn't it?(Original post by shorty.loves.angels)
I usually judge it by how many are given in the question. It also depends on how much difference it would make to the answer. Practising should clue you up though
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Re: OCR Physics A G484 Jan 2012 - The Newtonian WorldYeah if that's easier to follow then fair enough(Original post by wibletg)
Usually 3 sigfig isn't it? I've never really heard it explicitly stated as that so I've just got used to what is expected.
And I suppose the question doesn't always contain the same units you're going to calculate
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Re: OCR Physics A G484 Jan 2012 - The Newtonian WorldHey guys, the weekend before the storm is approaching, goodluck in your revision and the eventual exam!
Im focusing mostly on the "Thermal Physics" and "Ideal Gases" chapter. I don't study chemistry so I find some of the molar qualatative questions more difficult, whereas the circular motion and gravitational chapters come more natrually to me. One thing that confuses me somewhat is not mixing up the assumptions made as a result of Brownian Motion and the Kinectic Model of Gases.
