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

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    (Original post by redherring18)
    A* = 65
    What do you think?
    Do you think so? So many people I know didn't do that last question...


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    (Original post by CD223)
    Thoughts on boundaries?


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    58/59 for an A* or just wishful thinking?
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    Hmm, I may be looking at 68ish raw marks. Enough for 100?
    Edit: That's pretty wishful thinking, I may be looking at 90ish UMS.
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    So glad I only did this as an extra unit 😂 couldn't figure out 9 at all, did something really stupid and couldn't get ther it answer out at the beginning of 8 and didn't do the rest, and I'm pretty sure I got 4 completely wrong 😭 rest of the paper I think I did pretty well but this questions were worth so many marks haha, and I just didn't have enough time.
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    (Original post by Tiwa)
    58/59 for an A* or just wishful thinking?
    Regrettably it's probably wishful.

    Is this for your A2 maths or further maths?


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    (Original post by kyconny)
    Hmm, I may be looking at 68ish raw marks. Enough for 100?
    Edit: That's pretty wishful thinking, I may be looking at 90ish UMS.
    90 UMS is more likely. I think 100 is 72-73 unfortunately.


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    (Original post by JackNorman)
    So glad I only did this as an extra unit 😂 couldn't figure out 9 at all, did something really stupid and couldn't get ther it answer out at the beginning of 8 and didn't do the rest, and I'm pretty sure I got 4 completely wrong 😭 rest of the paper I think I did pretty well but this questions were worth so many marks haha, and I just didn't have enough time.
    Ah well at least it's just extra units!

    I did it as part of my A level maths lol. I don't even do further.


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    Does anyone have access to the paper? Would be good to add questions to the first post.


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    (Original post by CD223)
    Ah well at least it's just extra units!

    I did it as part of my A level maths lol. I don't even do further.


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    I'd say I feel bad for you but you've probably done well anyway mate haha
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    (Original post by CD223)
    Regrettably it's probably wishful.

    Is this for your A2 maths or further maths?


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    Just A2 Maths. I don't do further maths. 😬
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    (Original post by CD223)
    Do you think so? So many people I know didn't do that last question...


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    Too high? Hmm yes I didn't get that one either...I honestly have no idea what the bound will be it was just a shot in the dark :P what's your prediction?
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    (Original post by JackNorman)
    I'd say I feel bad for you but you've probably done well anyway mate haha
    Hmm yeah. I think I dropped 10-12 marks still. Overall I just need 183 for the year with 180+ in Core 3/4.

    Praying I did okay in Core 4 :/ I'll be gutted if I just miss out.


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    What are we thinking boundary might be for 80ums?
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    (Original post by redherring18)
    Too high? Hmm yes I didn't get that one either...I honestly have no idea what the bound will be it was just a shot in the dark :P what's your prediction?
    Realistically I'd say

    A* 66
    A 59
    B 52

    etc

    M2 boundaries are always so high for the difficulty of the paper -,-


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    (Original post by CD223)
    Realistically I'd say

    A* 66
    A 59
    B 52

    etc

    M2 boundaries are always so high for the difficulty of the paper -,-


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    I know right, I always do a paper and think 'that was fairly hard' and look at the grade boundaries and they dont reflect how I find the paper at all, unlike core maths reckon it's all the further maths people who do m2
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    This was harder than January 2013 which had a similar last question but it was only worth 5 marks, plus it was a show that question. This had an 8 marker in the end for which most people didn't have a clue on how to answer.

    It was 66 for an A* in Jan 13, so it won't be anything higher than that in my opinion. Probably around 63/64/65 for an A* and 71ish for full UMS.
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    (Original post by CD223)
    *** OFFICIAL AQA MECHANICS 2 MM2B JUNE 2015 EXAM DISCUSSION THREAD ***

    UNOFFICIAL MARK SCHEME

    1)
    a) (-32sin2t)i + (12cost)j (3 marks)
    b) 12.0N (2 marks)
    c) r = (2 + 2sin2t)i - (11 +3cost)j (5 marks)

    2)
    5.50m (4 marks)

    3)
    a)
    ii) 627J (3 marks)
    ii) 6.26ms^-1 (2 marks)
    b) μ = 0.400 (3 marks)

    4)
    a) T_AP =52.1 N (3 marks)
    b) Show that T_BP = 25/3 v^2 - 5gtan20 (4 marks)
    c) 2.90 ms^-1 (3 marks)

    5)
    R min = 2120 N (6 marks)
    R max = 2140 N

    6)
    θ = 1.15 (9 marks)

    7)
    a) Show that -0.3 dv/dt = v - 2.94 (2 marks)
    b) v = 27.06e^(-10/3 t) + 2.94 (5 marks)
    c) vt graph decaying exponentially - intercept at (0,30) approaching asymptote when v=2.94 (2 marks)

    8)
    a) Show that 5v^2=306x-4x^2-2704 (4 marks)
    b) Cord is stretched when x is greater than 26 (1 mark)
    c) 66.3m (2 marks)
    d)
    i) x = 38.3m (2 marks)
    ii) Vmax = 25.1ms^-1 (2 marks)

    9)
    μ = 0.268 (8 marks)

    Date: 22nd June 2015
    Time: 09:00am
    Duration: 1h 30m

    Any resources or revision tips people are willing to share?
    ______________________________

    CORE 3 EXAM DISCUSSION THREAD:
    http://www.thestudentroom.co.uk/showthread.php?t=3041463

    CORE 4 EXAM DISCUSSION THREAD:
    http://www.thestudentroom.co.uk/showthread.php?t=3041479

    ______________________________

    RESOURCES:
    I'm pretty sure that was only worth 1 mark.

    Maybe the center of mass question was worth 5 marks?
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    (Original post by Reverse Swing)
    I'm pretty sure that was only worth 1 mark.

    Maybe the center of mass question was worth 5 marks?
    CoM was definitely 4, but I'm not sure about the other one.
    The MS definitely needs editing. Anyone know what's wrong!?
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    could someone show the working for q 2? cant remember how it was done and if i did it right?
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    i got the max of v to be 11.2, anyone?
    doesnt matter, irealise im wrong
 
 
 
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