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Edexcel - M3 - 18th May 2016 Watch

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    (Original post by DesignPredator)
    My answers are

    1a) 1/3 N
    b) 7 s
    2 3cm
    3a) 3.57m
    b) 24 ms-2
    4a) Shown
    b) 18.4
    5 Shown
    6a) sqrt(3gl/2)
    b) Shown
    7a) SHM Proved Period 2pi/5
    b) 4 ms-1
    c) 0.483 s
    d) SHM Proved Omega=sqrt(125/8)
    e) 0.632 m
    (Original post by Insight314)
    Agree. I think I got 100 UMS but what about missing the units in question 2?
    How do you remember all these answers!!?
    Looks like I may have got full marks, or maybe dropped 1 or so.
    Does full marks guarantee 100 UMS? If most people get 75/75 do they all get 100ums?

    I am feeling pretty awesome atm, I am basically guaranteed an A in further maths and if I get 100UMS in this m3 then I can afford to get 79 or 80 in FP2 for an A*!
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    You should be fine. If the A boundary is even it will 74 for 100ums. So many 100ums people! Then agian this is tsr.


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    How did you guys prove the second SHM?
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    (Original post by DesignPredator)
    My answers are

    1a) 1/3 N
    b) 7 s
    2 3cm
    3a) 3.57m
    b) 24 ms-2
    4a) Shown
    b) 18.4
    5 Shown
    6a) sqrt(3gl/2)
    b) Shown
    7a) SHM Proved Period 2pi/5
    b) 4 ms-1
    c) 0.483 s
    d) SHM Proved Omega=sqrt(125/8)
    e) 0.632 m
    Got all the same answers apart from the question about period for circular motion because I didn't do it. (the 4 mark one)

    A few things:

    for 3b) did you need the answer from part a? I got 24ms^-2 but dont remember what answer to part a was

    For question 6b) My method was correct but I got this as my last equation

    g(l-x) = u^2 - g(l-x)

    where x = AB and u = part a answer

    It was suppose to be

    g(l-x) = u^2 - 2g(l-x)

    so my answer was l/4 for minimum value of AB...
    How many marks would I lose?

    I wrote all correct assumptions: i.e Tension is zero at highest point(90* to the horizontal)
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    (Original post by Insight314)
    Correct. I got the same. And then the final answer is 3.57 to 3 s.f.


    Posted from TSR Mobile
    (Original post by physicsmaths)
    3+3root6 all over 5


    Posted from TSR Mobile
    Phew, I got that and thought I must have been wrong. I spent the last 30 minutes of the exam trying to 'correct' my answer. I tried it a few more times, using different methods, each time getting a different answer lol so I stuck with that
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    It's probably going to be 72 for A*, I highly doubt that Edexcel would set A* as 72+, despite the paper difficulty.
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    (Original post by DesignPredator)
    It's probably going to be 72 for A*, I highly doubt that Edexcel would set A* as 72+, despite the paper difficulty.
    So happy right now!! This means I am almost guaranteed an A and I just need a decent FP2 for A*!!
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    (Original post by physicsmaths)
    You should be fine. If the A boundary is even it will 74 for 100ums. So many 100ums people! Then agian this is tsr.


    Posted from TSR Mobile
    Thanks!

    M8, I am really glad for your 100UMS. One step closer to Cambridge!

    I actually panicked on Question 6 b) for like a minute, but then realised I had enough time to finish Question 7 and get back to it.

    I think the paper was pretty standard except that I think 6 b) caught out a few people.

    Anyway, with (hopefully) 100UMS banked I think I will be fine with A* in Further Maths, since it counters any potential flops in M4 and M5; and same for you with the Stats and Decision modules.


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    Likely not then, my bad
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    when will a mark scheme go up?
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    Add a vote please in
    http://www.thestudentroom.co.uk/show....php?t=4094789
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    (Original post by oShahpo)
    How did you guys prove the second SHM?
    Do -T=(newmass)a
    That was it, it was only 3 marks.


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    (Original post by physicsmaths)
    You should be fine. If the A boundary is even it will 74 for 100ums. So many 100ums people! Then agian this is tsr.


    Posted from TSR Mobile
    How did you prove the second SHM after the coalescing? F = -T but with the new mass?
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    (Original post by physicsmaths)
    Do -T=(newmass)a
    That was it, it was only 3 marks.


    Posted from TSR Mobile
    Yea exactly as I did 100% UMS then if I didn't misround any of the answers.
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    (Original post by physicsmaths)
    Do -T=(newmass)a
    That was it, it was only 3 marks.


    Posted from TSR Mobile
    I was actually baffled at how easy it was. Probably caught out a few people, I am not joking. I was scared that I got it wrong lol.


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    (Original post by DesignPredator)
    It's probably going to be 72 for A*, I highly doubt that Edexcel would set A* as 72+, despite the paper difficulty.
    It will not be 72 for a* lol
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    (Original post by BBeyond)
    It will not be 72 for a* lol
    I think it would be way lower. TSR does not represent how most people found the exam, and 6 b) would've caught quite a few people off.


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    Hey guys did you notice that the mass of the particle is 2m(not m) in question 6??
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    To people worrying - Every year the people who did well on the paper on TSR underestimate the general difficulty and overestimate the grade boundaries, it was definitely not a hard paper but it wasn't easy enough to justify S2 level boundaries. Personally can't see A* going above 70 but just my opinion.
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    (Original post by Maths2002)
    Hey guys did you notice that the mass of the particle is 2m(not m) in question 6??
    Yeah that irritated me so much. I kept writing 1/2 mv^2... mgh.. then realising I had to stick a stupid 2 in there
 
 
 
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