AQA A2 Mathematics MM2B Mechanics 2 - Monday 22nd June 2015 [Exam Discussion Thread]

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My teacher wen through all the papers and said the hardest one she's seen is the Jan 13 paper. It was a normal paper for the majority of the questions, but the last two questions required serious thinking

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Reply 81

CD223

Original post by bitofageek

Ah, I've only done up to Jan 2010. Do you happen to know what topics they were on?

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Reply 82

bitofageek

Original post by CD223

Ah, I've only done up to Jan 2010. Do you happen to know what topics they were on?

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Yeah hookes law was one. The other was a mix of moments and vertical circular motion

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Reply 83

CD223

Original post by bitofageek

Yeah hookes law was one. The other was a mix of moments and vertical circular motion

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Ah crap, I've not even finished Hooke's Law. It's funny how such a simple concept can lead to such horrid complex questions.

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Reply 84

sarcastic-sal

Original post by CD223

Without giving too much away, what made it hard? Was it just not as guided as previous papers in breaking down step by step what to do for each question?

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The majority was fine, the first 5 questions were pretty much standard M2. The last 3 questions came at stuff from a different angle - I can totally understand where the answer has come from looking at the mark scheme, but in the limited time available I just didn't 'click' as to how to do it.

Reply 85

CD223

Original post by sarcastic-sal

That worries me. My M2 mock is 8th May. Is there any good way I can prepare?

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Reply 86

sarcastic-sal

Original post by CD223

That worries me. My M2 mock is 8th May. Is there any good way I can prepare?

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I think doing at least one of the more recent papers beforehand (don't go crazy and do all of them though, save them for closer to the real thing). I'd also go through the paper with a highlighter and circle/draw attention to anything important beforehand (I didn't do this and I think it might have helped).

Reply 87

CD223

Original post by sarcastic-sal

Thank you for the tips! :smile:

I'll try and recent paper. Maybe June 2013?

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Reply 88

CD223

Can someone help me with this question? (Part B). I've formed a quadratic but it's not the same as the one in the question as its in terms of x, the extension.

ImageUploadedByStudent Room1430332532.654778.jpg

ImageUploadedByStudent Room1430332532.654778.jpg

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Reply 89

Shadez

Original post by CD223

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Alrighty I'll try and help you out :biggrin:

So for part bi the statement " the maximum length of the string in the subsequent motion is L" basically means that L is the sum of the extension and natural length. So

L=e+2

where

e

is the extension (I think you've got it as x) which means

e=2-L

. Ok great we've got the extension in terms of

L

now so that means we can use it in the EPE formula in place of the

e

EPE = \dfrac {560(e)^2}{4}[br]e=L-2[br]EPE = \dfrac {560(L-2)^2}{4}[br]EPE = 140(L-2)^2[br]EPE = 140(L^2 - 4L + 4)

Using conservation of energy the Initial GPE = EPE + KE + Final GPE . If we consider the maximum height to be L then equation becomes Initial GPE = EPE (the KE disappears because the final velocity is zero at the maximum length of the string)

Ok Initial GPE = EPE

20gL=140(L^2 - 4L + 4)

and bish bash bosh you should get

5L^2-27L+20=0

Reply 90

CD223

Original post by Shadez

Alrighty I'll try and help you out :biggrin:

So for part bi the statement " the maximum length of the string in the subsequent motion is L" basically means that L is the sum of the extension and natural length. So

L=e+2

where

e

is the extension (I think you've got it as x) which means

e=2-L

. Ok great we've got the extension in terms of

L

now so that means we can use it in the EPE formula in place of the

e

EPE = \dfrac {560(e)^2}{4}[br]e=L-2[br]EPE = \dfrac {560(L-2)^2}{4}[br]EPE = 140(L-2)^2[br]EPE = 140(L^2 - 4L + 4)

20gL=140(L^2 - 4L + 4)

and bish bash bosh you should get

5L^2-27L+20=0

Thank you!

How are you finding M2 revision? Do you do any other modules?

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Reply 91

Tiwa

How is everyone finding this unit?

Reply 92

Shadez

Original post by CD223

Thank you!

How are you finding M2 revision? Do you do any other modules?

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Tricky question since I've not done much recently :biggrin:

. But it's definitely the hardest module out of the ones I'm doing (FP1, M1 and M2). Actually come to think of it, it's the hardest out of all the modules I've done (D1-2 and C1-4).
You've posted some good questions which keeps me on my toes. Keep them coming :woo: