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

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Reply 580

CD223

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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Reply 581

Tiwa

Original post by CD223

Thoughts on boundaries?

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58/59 for an A* or just wishful thinking?

Reply 582

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.

(edited 8 years ago)

Reply 583

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.

Reply 584

CD223

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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Reply 585

CD223

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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Reply 586

CD223

Original post by JackNorman

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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Reply 587

CD223

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

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Reply 588

JackNorman

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

Reply 589

Tiwa

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. 😬

Reply 590

redherring18

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?

Reply 591

CD223

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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Reply 592

Gymnast

What are we thinking boundary might be for 80ums?

Reply 593

CD223

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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Reply 594

redherring18

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 :frown:

reckon it's all the further maths people who do m2

Reply 595

Reverse Swing

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.

Reply 596

Reverse Swing

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

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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

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