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# Edexcel - M3 - 18th May 2016 watch

1. (Original post by ombtom)
(Original post by Euclidean)
What makes you think it went badly? I'm sure it's not as bad as you think

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Screwed up Q2 by doing the triangle the wrong way around so my answer was 6; couldn't do 6(b) at all probably no marks there and I've probably drobbed at least 5-7 marks in other places.. Definitely a C, if not scraped B.
2. So in the first question I made a stupid mistake, found dv and multiplied by v but then wrote squared on the denominator instead of cubed and used that as acceleration to find force. How many marks does anyone reckon that will lose?
3. (Original post by Khed Aydi)
If you write down two answers, one which is correct and the other incorrect. Do examiners ignore the incorrect answer and still give the marks?
At the start of every mark scheme it says something like "if they provide two solutions, mark both and award the highest mark. If one is crossed out, ignore it. If both are crossed out, mark both".

(Original post by Foutre en L'air)
Screwed up Q2 by doing the triangle the wrong way around so my answer was 6; couldn't do 6(b) at all probably no marks there and I've probably drobbed at least 5-7 marks in other places.. Definitely a C, if not scraped B.
I turned it around too (it made y a bit simpler). My answer was also 6cm. All you had to do from there was 9-6 = 3cm, so you probably only dropped 1 or 2 marks!
4. Hey guys, in question 6b they said that the particle completed a semicircle, all we need to do is solve for T at top >=0 and prove that the radius of oscillating with peg is =< 1/2l, then AB is >= 1/2l right?
Just to be sure I didn't misread it
5. Im praying to get as many method marks as possible for this paper
6. does anybody have model answers or the questions?
7. (Original post by ombtom)
At the start of every mark scheme it says something like "if they provide two solutions, mark both and award the highest mark. If one is crossed out, ignore it. If both are crossed out, mark both".

I turned it around too (it made y a bit simpler). My answer was also 6cm. All you had to do from there was 9-6 = 3cm, so you probably only dropped 1 or 2 marks!
Yep! I flipped it too to get a nicer equation and just did 9-6

Since this question was very geometrically based (distance from AB), there's no way they wouldn't accept our method
8. (Original post by DesignPredator)

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
Ah I got 10.5 for 1b?!?!
9. (Original post by Maths2002)
Hey guys, in question 6b they said that the particle completed a semicircle, all we need to do is solve for T at top >=0 and prove that the radius of oscillating with peg is =< 1/2l, then AB is >= 1/2l right?
Just to be sure I didn't misread it
Yea
10. (Original post by Student403)
Yep! I flipped it too to get a nicer equation and just did 9-6

Since this question was very geometrically based (distance from AB), there's no way they wouldn't accept our method
Hey I thought you were hours ahead of UK time; who does the IAL paper?
11. someone please tell me how many marks i may drop in that 9 mark tension question... i considered the radius as l/2 sin30 instead of l/2 tan30 and it messed up my horizontal equation however i got my vertical equation correct and submitted the show that answer into it to find the tension in B and then this worked out for the part b question show that. However, I did continue with my horizontal equation but did not get the show that and i am just wondering how many marks i may get out of the 9 marks. Considering i got the tension in B correct using the show that. I did the method all correct, just the radius messed up everything... Many thanks.
12. (Original post by Maths2002)
Hey guys, in question 6b they said that the particle completed a semicircle, all we need to do is solve for T at top >=0 and prove that the radius of oscillating with peg is =< 1/2l, then AB is >= 1/2l right?
Just to be sure I didn't misread it
(Original post by oShahpo)
Yea

Almost.

T must be > 0, not >= 0. This shows that the radius of the peg < 1/2l, which shows that AB >= 1/2 l
13. Have voted and looked at last year's voting and UMS
http://www.thestudentroom.co.uk/show....php?t=4094789
14. (Original post by ombtom)
Hey I thought you were hours ahead of UK time; who does the IAL paper?
I'm 2 hours ahead (daylight savings shiz) so I started my exam at 10:45am, which is 8:45am for you guys. Ayman did IAL
15. (Original post by Student403)
..
out of interest how do the markers deal with small algebraic slips? I mean last year I got 70/75 , the lost marks i assume to a small slip or two but idk. If say it you miswrote down a number at the beginning of a 10 marker but the rest correct from the number you started with, how many could you lose? I imagine itd be about 2 or so but who knows
16. (Original post by DesignPredator)

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
I got 0.484 for 7c?
Apart from that I got the same answers as you
17. (Original post by EnglishMuon)
out of interest how do the markers deal with small algebraic slips? I mean last year I got 70/75 , the lost marks i assume to a small slip or two but idk. If say it you miswrote down a number at the beginning of a 10 marker but the rest correct from the number you started with, how many could you lose? I imagine itd be about 2 or so but who knows
I think that depends on the number of A1 marks (AFAIK A1ft means you can still pick up the method mark)

Ayman! is an expert on this
18. (Original post by Insight314)
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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Haha yeh same

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19. So, two mistakes for me:/ firstly, Q2b, found the radius instead of AB, and secondly, in 7b, I managed to forget to squareroot the v^2 I got from an energy equations, so got the wrong v value, then I used that in part d for the amplitude and got that bit wrong too :/ all of my methods were correct (I think)

Can anyone remember how many marks Q7 was in each part? Or have any idea how many marks I'll lose?

Thank guys!
20. (Original post by 1asdfghjkl1)
I got 0.484 for 7c?
Apart from that I got the same answers as you
Yeah same

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