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

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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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    (Original post by bitofageek)
    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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    Ah, I've only done up to Jan 2010. Do you happen to know what topics they were on?


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    (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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    (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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    (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.
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    (Original post by sarcastic-sal)
    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.
    That worries me. My M2 mock is 8th May. Is there any good way I can prepare?


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    (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).
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    (Original post by sarcastic-sal)
    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).
    Thank you for the tips! I'll try and recent paper. Maybe June 2013?


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    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.

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    (Original post by 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.

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    Alrighty I'll try and help you out

    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}

e=L-2

EPE = \dfrac {560(L-2)^2}{4}

EPE = 140(L-2)^2

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
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    (Original post by Shadez)
    Alrighty I'll try and help you out

    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}

e=L-2

EPE = \dfrac {560(L-2)^2}{4}

EPE = 140(L-2)^2

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
    Thank you!

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


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    How is everyone finding this unit?
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    (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 . 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:
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    (Original post by Tiwa)
    How is everyone finding this unit?
    Harder than C3 and C4 to get the knack of to be honest! You?


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    (Original post by Shadez)
    Tricky question since I've not done much recently . 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:
    I totally agree! Harder than C3 and C4 I think!

    Thanks for your help - if I see another tricky one I'll post it here


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    (Original post by CD223)
    Harder than C3 and C4 to get the knack of to be honest! You?


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    Agreed.
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    (Original post by Tiwa)
    Agreed.
    Have you done many papers? I feel I've done quite a few "older" ones but still can't get it right!


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    (Original post by CD223)
    Have you done many papers? I feel I've done quite a few "older" ones but still can't get it right!


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    About 5?

    btw, could you help me with c part 2 of this question?
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    (Original post by Tiwa)
    About 5?

    btw, could you help me with c part 2 of this question?
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    Thanks so much! But I don't understand where the angle 70 comes from...
 
 
 
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