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M2 May 2012 Edexcel - Post Exam Thread - Paper and Solutions in the FIRST POST Tweet

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IMPORTANT: You must wait until midnight (morning exams)/4.30AM (afternoon exams) to discuss Edexcel exams and until 1pm/6pm the following day for STEP and IB exams. Please read before posting, including for rules for practical and oral exams. 28-04-2013
1. Re: M2 May 2012 Edexcel - Post Exam Thread - Paper and Solutions in the FIRST POST
Honestly, I didn't think it was a particularly unfair paper. It was hard, but everything in it has come up in past papers before. The only trouble for me was there was I had to rush it quite a bit because the questions took a bit of thinking before hand so I didn't get a chance to double check my answers.
2. Re: M2 May 2012 Edexcel - Post Exam Thread - Paper and Solutions in the FIRST POST
For the collisions question when you had to state the range of values e, I wrote 1/6 < e < 1

But not that it is less than or equal to 1. I don't understand why you would have to say that it could be equal to 1 because wouldn't that be implying that an elastic collision is possible in this collision?

Also for the impulse question. The two components were 10 and -7.5. I got 10 and 7.5, no minus sign :/ how many marks do you reckon out of those 6 would i lose for that.

Thanks.
3. Re: M2 May 2012 Edexcel - Post Exam Thread - Paper and Solutions in the FIRST POST
(Original post by Kaiser7)
In the impulse question, I got the speed in part i) as 80 ms-1, then in part ii) I calculated it as 40j acting vertically upwards.

Basically I stated that the speed is 80 in i) and that it is 40 in ii) :P

Can the examiner give me the marks for the speed for this or do I lose the marks for the speed because I stated it incorrectly in part i)?

They are required to mark what comes later as your answer so if in part 2 you wrote something like speed = 40ms or |V|=40ms then you would get the marks, however if you just left it in vector form as (0i, 40j) then I doubt you would get it.
4. Re: M2 May 2012 Edexcel - Post Exam Thread - Paper and Solutions in the FIRST POST
(Original post by Darkarium)
It was hard, but everything in it has come up in past papers before.
Stylistically 4(b) and 7(c) have never come up before. The method to solve them is straightforward, but decoding the actual question and knowing what to do in exam conditions with such immense pressure is not easy.
5. Re: M2 May 2012 Edexcel - Post Exam Thread - Paper and Solutions in the FIRST POST
I've had a look at previous mark schemes, and the mark allocation suggests that they simply wanted 40N vertically upwards. It'll probably be M1 M1 A1 for resolving (another method mark because the angle for F wasn't in the diagram) and then A1 for stating vertically upwards.

Just my thoughts. If Arsey is right with his extra bits, they are being incredibly harsh on the marks. What he's done in that question is usually M1 A1 (resolving horizontally) M1 A1 (resolving vertically) M1 A1 (finding the magnitude) M1 A1 (finding the angle).

Adding to this, the June 2009 paper had a question worded Find the magnitude and direction of the force exerted on the rod AB at A. and there were seven marks allocated.
Last edited by Groat; 01-06-2012 at 16:03.
6. Re: M2 May 2012 Edexcel - Post Exam Thread - Paper and Solutions in the FIRST POST
(Original post by Groat)
I've had a look at previous mark schemes, and the mark allocation suggests that they simply wanted 40N vertically upwards. It'll probably be M1 M1 A1 for resolving (another method mark because the angle for F wasn't in the diagram) and then A1 for stating vertically upwards.

Just my thoughts. If Arsey is right with his extra bits, they are being incredibly harsh on the marks. What he's done in that question is usually M1 A1 (resolving horizontally) M1 A1 (resolving vertically) M1 A1 (finding the magnitude) M1 A1 (finding the angle).
Don't worry about it too much man, you can't really work it out for sure, and it's in the past!

Concentrate on the Further Pure
7. Re: M2 May 2012 Edexcel - Post Exam Thread - Paper and Solutions in the FIRST POST
(Original post by Jorgeyy)
Don't worry about it too much man, you can't really work it out for sure, and it's in the past!

Concentrate on the Further Pure
I'm not worrying, just hoping to clear it up for people who are confused.
8. Re: M2 May 2012 Edexcel - Post Exam Thread - Paper and Solutions in the FIRST POST
(Original post by Groat)
I've had a look at previous mark schemes, and the mark allocation suggests that they simply wanted 40N vertically upwards. It'll probably be M1 M1 A1 for resolving (another method mark because the angle for F wasn't in the diagram) and then A1 for stating vertically upwards.

Just my thoughts. If Arsey is right with his extra bits, they are being incredibly harsh on the marks. What he's done in that question is usually M1 A1 (resolving horizontally) M1 A1 (resolving vertically) M1 A1 (finding the magnitude) M1 A1 (finding the angle).
Hmm for some strange reason, under the exam pressure I forgot how to say the direction simply. Instead of saying vertically upwards, I'm pretty sure I said the word vertical, but also said in the positive j direction in brackets. Do you think this will get me the mark?
9. Re: M2 May 2012 Edexcel - Post Exam Thread - Paper and Solutions in the FIRST POST
(Original post by Groat)
I've had a look at previous mark schemes, and the mark allocation suggests that they simply wanted 40N vertically upwards. It'll probably be M1 M1 A1 for resolving (another method mark because the angle for F wasn't in the diagram) and then A1 for stating vertically upwards.

Just my thoughts. If Arsey is right with his extra bits, they are being incredibly harsh on the marks. What he's done in that question is usually M1 A1 (resolving horizontally) M1 A1 (resolving vertically) M1 A1 (finding the magnitude) M1 A1 (finding the angle).
Yes, that's what I thought too. There's no way a question where you need to find an unknown angle, resolve in two directions, and then work out not only the magnitude but also the direction of the resultant force, would only be 4 marks.
10. Re: M2 May 2012 Edexcel - Post Exam Thread - Paper and Solutions in the FIRST POST
(Original post by und)
Yes, that's what I thought too. There's no way a question where you need to find an unknown angle, resolve in two directions, and then work out not only the magnitude but also the direction of the resultant force, would only be 4 marks.
See my addition to the post. I think we can assume that the other parts weren't required, and this was just an easier question on the paper.
11. Re: M2 May 2012 Edexcel - Post Exam Thread - Paper and Solutions in the FIRST POST
(Original post by Groat)
See my addition to the post. I think we can assume that the other parts weren't required, and this was just an easier question on the paper.
Nice find. It would be daft of them to write 'vertical component' in the question anyway if they were asking for the resultant force.

I've asked a couple of times already in this thread but nobody's replied to me about it, so I'll ask you because you seem knowledgeable about mark allocation. If you get the whole method right (eg. when finding the speed in the impulse question) but make a small algebraic mistake and/or simply write down the wrong speed even with correct working, do you lose just one accuracy mark or could you potentially lose more? I'm hoping I didn't write down the wrong answer but 40ms^-1 is the only number I don't remember from the exam. I hate it when I can't quite remember my answer!
12. Re: M2 May 2012 Edexcel - Post Exam Thread - Paper and Solutions in the FIRST POST
(Original post by Arsey)
M2 May 2012

Overall I thought this was a very hard paper. Jan 2012 was a joke, so they really made up for it with this one.

Q1 Linear kinematics

Fairly easy C2 = 0 was a bit odd

Q2 Collisions

Slighly trickier than normal I would say

Q3 Moments

Significantly harder than normal, it was strange that it was just pivoted in mid-air. Aslo the wording off part b) may cause problems

[b]EDIT - I may have overcomplicated b)

I thought it was referring to a vertical plane because the vertical plane, asking for direction seems too easy... it could of course simply mean up or down

???for 5 marks, it could well just be 40.1 acting vertically upwards ???

Q4 COM

a) was okay but b) will be a MASSIVE bloodbath; I can not see many people getting it correct.

Q5 Impulse

Very strange question, this again will cause a lot of problems

Q6 WEP

a) and b) are fine but I think c) will cause a lot of problems

Q7 Projectiles

a) and b) should be okay but I think c) is very tricky

Last few June boundaries were 68, 61, 62, 64, 58 for 80ums

This was a hard paper and I think the boundaries will reflect that, so I will guess at

100ums - 70
90ums - 63
80ums - 56
70ums - 49
60ums - 42
50ums - 35
40ums - 28

This thread will be locked at somepoint and then unlocked at midnight following the Mechanics 2 examination. I will upload the paper and my solutions to this post.

I will do my best to answer questions about the paper but please try to read the thread first so that I am not answering the same questions lots of times.Here are some links to previous M2 threads, they are worth a read and you will see what the common errors were...

Jan 2012 - http://www.thestudentroom.co.uk/show....php?t=1906907

June 2011 - http://www.thestudentroom.co.uk/show....php?t=1618497

The second link has loads of past papers, mark schemes, model solutions etc
Good luck.
Hey arsey, for question 6 i didnt add the trailer and car mass together, i just used the car mass to find the acceleration. meaning i got different answers for question a and b. how many marks do you think i will lose because of this?
13. Re: M2 May 2012 Edexcel - Post Exam Thread - Paper and Solutions in the FIRST POST
i done question 6 c using motion equations will i get any marks
14. Re: M2 May 2012 Edexcel - Post Exam Thread - Paper and Solutions in the FIRST POST
(Original post by und)
Nice find. It would be daft of them to write 'vertical component' in the question anyway if they were asking for the resultant force.

I've asked a couple of times already in this thread but nobody's replied to me about it, so I'll ask you because you seem knowledgeable about mark allocation. If you get the whole method right (eg. when finding the speed in the impulse question) but make a small algebraic mistake and/or simply write down the wrong speed even with correct working, do you lose just one accuracy mark or could you potentially lose more? I'm hoping I didn't write down the wrong answer but 40ms^-1 is the only number I don't remember from the exam. I hate it when I can't quite remember my answer!
If you write down the wrong speed, but have the right velocity and direction, you'll only lose one mark. If your velocities are wrong because of an earlier slip, it's likely you lose quite a few three accuracy marks. I presume the allocation for this question will be B1 for working out the impulse in vector form, then M1A1 for the impulse equation, A1 for finding the final velocity in vector form, A1 for stating the speed and A1 for stating the direction.

I've just skipped through mark schemes and rarely see error carried forward or follow through marks.
Last edited by Groat; 01-06-2012 at 16:25.
15. I didn't think it was that bad a paper, but there were a lot of things that could trip you up if you didn't notice them.

For the impulse question, is the speed 20ms^-1 or 40ms^-1? Because I put the impulse into vector format straight away and got v= (0i + 40j) and then stated the speed was 40ms^-1 vertically upwards. Is that all you has to do?
Last edited by Wilko94; 01-06-2012 at 16:25.
16. Re: M2 May 2012 Edexcel - Post Exam Thread - Paper and Solutions in the FIRST POST
(Original post by Groat)
If you write down the wrong speed, but have the right velocity and direction, you'll only lose one mark. If your velocities are wrong because of an earlier slip, it's likely you lose quite a few three accuracy marks. I presume the allocation for this question will be B1 for working out the impulse in vector form, then M1A1 for the impulse equation, A1 for finding the final velocity in vector form, A1 for stating the speed and A1 for stating the direction.

I've just skipped through mark schemes and rarely see error carried forward.
If the marks are allocated like that I'll definitely get B1 and M1A1, but I'm not sure about the others. I'd like to think I put the right answer anyway, or even if I didn't the expected low grade boundaries should be low enough to cover that mistake.

(Original post by Wilko94)
I didn't think it was that bad a paper, but there were a lot of things that could trip you up if you didn't notice them.

For the impulse question, is the speed 20ms^-1 or 40ms^-1? Because I put the impulse into vector format straight away and got v= (0i + 40j) and then stated the speed was 40ms^-1 vertically upwards. Is that all you has to do?

This was posted from The Student Room's iPhone/iPad App
Yes, that was pretty much it. 40ms^-1 vertically upwards/0 degrees to the vertical/90 degrees to the horizontal. I put all three!
17. Re: M2 May 2012 Edexcel - Post Exam Thread - Paper and Solutions in the FIRST POST
(Original post by iAre Teh Lejend)
im laughing so much at this comment, hahahahaha so true and sad, yet funny.
atleast whilst my A* slips away i provide entertainment for others
i'll try reverse the rolls for FP2 and 3 i suppose
18. Re: M2 May 2012 Edexcel - Post Exam Thread - Paper and Solutions in the FIRST POST
this paper was haaard, i probably got 56- 57, only time can reveal, i need 90% FOR A in AS f. maths,
so we 'll wait.
19. Re: M2 May 2012 Edexcel - Post Exam Thread - Paper and Solutions in the FIRST POST
I thought this paper wasn't too bad at first. But looking back through this I've realized I've made mistakes in the worst places. I got the wrong answer for 6a) which means I've got it wrong for part b), and ditto for 7b) and c). So I reckon I got about 65 marks out of 75 because everything else was fine.
20. Re: M2 May 2012 Edexcel - Post Exam Thread - Paper and Solutions in the FIRST POST
Shameful as it may be, this paper actually made me cry. I was the only person taking it in my school, only person doing further maths, and i had a clash. I sat my D2 exam afterwards still crying. But now i feel silly! Haha