Applied Maths aftermath

Kremin · 19-06-2015 11:59am #1

didnt see one and wasnt sure if the general should be used...
Wtf was that projectile question?
I think that was the hardest app. Maths exam in a while? All the questions seemed really long

OMGeary · 19-06-2015 12:20pm

Somehow I missed the shortest distance q in question 2, no ****ing idea how I missed it

PotmBottom · 19-06-2015 12:23pm

I couldn't do 3(a) at all, very tough question I thought, does it matter if your angle is incorrect for the following parts of the question? Our teacher never told us how it's marked really. I thought 1,10 and 5 were lovley, 4 was good as well. For someone who was a d3 student at my pre I'm delighted how far I've come.

Kremin · 19-06-2015 12:27pm

PotmBottom wrote: »

I couldn't do 3(a) at all, very tough question I thought, does it matter if your angle is incorrect for the following parts of the question? Our teacher never told us how it's marked really. I thought 1,10 and 5 were lovley, 4 was good as well. For someone who was a d3 student at my pre I'm delighted how far I've come.

I only got q3 when i realised Sy was -3 not 0.. Had to use a lot of identities to get there.. Could not do part b, attempted it many ways but couldnt get it. I felt like every part iii of a question was a trick and it really worried me.. Like the speed of the particle when it starts moving?

AlfaJack · 19-06-2015 12:29pm

I wrote Sy was -3 but still got weird answers but hopefully i'll get the marks for the method :P

Kremin · 19-06-2015 12:30pm

AlfaJack wrote: »

I wrote Sy was -3 but still got weird answers but hopefully i'll get the marks for the method :P

same.. i had like Cos^2A, converted it to Cos2A and then to Tan^2a+1 or something, i got a negative angle so I dont eve know.

expiiplus1 · 19-06-2015 12:33pm

The way do do 3 a) was to make Sy(0) =3.
I thought it was a lovely test. Definitely much easier that year. I didn't do it, but 4b looked the hardest on the test.

dalta5billion · 19-06-2015 12:33pm

I avoided the projectiles, other than that seemed alright.

For the particles with the loose string, did P begin to move at the same speed as Q was a split second earlier?

PotmBottom · 19-06-2015 12:33pm

AlfaJack wrote: »

I wrote Sy was -3 but still got weird answers but hopefully i'll get the marks for the method :P

I did as well, like tan = 24 or 27 or something and -.17, very odd, tried it 4 or 5 times and couldn't get a different answer, perhaps there is something wrong with the q? Did they leave some information out? I used the fact that 1/cos^x = 1+tan^x and I couldn't get it.

Kremin · 19-06-2015 12:35pm

dalta5billion wrote: »

I avoided the projectiles, other than that seemed alright.

For the particles with the loose string, did P begin to move at the same speed as Q was a split second earlier?

I'm not sure, I calculated the new acceleration but it was still an acceleration not deceleration...... so the speed wouldnt have changed?

Kremin · 19-06-2015 12:35pm

PotmBottom wrote: »

I did as well, like tan = 24 or 27 or something and -.17, very odd, tried it 4 or 5 times and couldn't get a different answer, perhaps there is something wrong with the q? Did they leave some information out? I used the fact that 1/cos^x = 1+tan^x and I couldn't get it.

That's what I got too, 17 or 27 and -.175 if i remember correctly, the numbers are vague but I was definitely in and around there.

rooney1369 · 19-06-2015 12:38pm

Were angles for 3(a) tan^-1 4/3 and tan^-1 3/4 as the only 2 possible triangles that can be made with hypotenuse of 50 are with sides 40 and 30 and 30 and 40?

rooney1369 · 19-06-2015 12:41pm

rooney1369 wrote: »

Were angles for 3(a) tan^-1 4/3 and tan^-1 3/4 as the only 2 possible triangles that can be made with hypotenuse of 50 are with sides 40 and 30 and 30 and 40?

Ah **** ignore my stupidity

Doctorhopeful · 19-06-2015 12:41pm

Over the moon with that paper, besides a few little bits I think i managed everything

did Qs 2,3,4,5, 8, 10, and i was able to get the answer everytime they said "show blah = blah"
Went in hoping for a B3, i'd be disappoited now if i don't manage an A :P thought it was much easier than last year, but the projectiles Q required a lot of thinking and visualising. IM SO GLAD IM FREE

Sy = -3 NOOOOO IM SUCH A FOOL, never gonna forgive myself for putting it equal to 0!!! xD

PotmBottom · 19-06-2015 12:42pm

Kremin wrote: »

That's what I got too, 17 or 27 and -.175 if i remember correctly, the numbers are vague but I was definitely in and around there.

88 degrees ring more of a bell?

Kremin · 19-06-2015 12:43pm

Doctorhopeful wrote: »

Over the moon with that paper, besides a few little bits I think i managed everything did Qs 2,3,4,5, 8, 10, and i was able to get the answer everytime they said "show blah = blah"
Went in hoping for a B3, i'd be disappoited now if i don't manage an A :P thought it was much easier than last year, but the projectiles Q required a lot of thinking and visualising. IM SO GLAD IM FREE

I did Q1,Q3,Q4,Q5,Q8,Q10
Q10 was really handy, as was Q8 I thought.... do you remember what you got for x? I think i got 1/root12? I wasn't sure what the best method to differentiate T was and I remembered my teacher saying you can ignore the 2pi and square root as its periodic or something... hopefully I wasn't mistaken D=

PotmBottom wrote: »

88 degrees ring more of a bell?

I didn't convert to degrees at all, it said values of TanB so I just left it as that?

expiiplus1 · 19-06-2015 12:44pm

I think so tan-1(28) should be your man

Doctorhopeful · 19-06-2015 12:44pm

Kremin wrote: »

I did Q1,Q3,Q4,Q5,Q8,Q10
Q10 was really handy, as was Q8 I thought.... do you remember what you got for x? I think i got 1/root12? I wasn't sure what the best method to differentiate T was and I remembered my teacher saying you can ignore the 2pi and square root as its periodic or something... hopefully I wasn't mistaken D=

I ended up with 2root3 i think, but not entirely sure if that was right! Bollix, didn't realise now that 2root3 is bigger than 0.5 oops :P

Kremin · 19-06-2015 12:47pm

Doctorhopeful wrote: »

I ended up with 2root3 i think, but not entirely sure if that was right!

ah well, probably get a good few attempt marks whichever one of us is wrong anyway.

Doctorhopeful · 19-06-2015 12:48pm

Realising a couple of stupid mistakes I made, maybe i shouldn't be so quick to think I did better than a B3 after all :P i'm just so glad I was able to give a decent attempt at 6 of them, that's the real success story!

expiiplus1 · 19-06-2015 1:03pm

I maintain that it was the easiest exam in years.
Q1a was trivial and b wasn't much harder.
Q2 was a complete reversion to predictable format
Q3a was weirdly phrased, but the maths involved was predictable. Q3b was trivial
Q4 I didn't do, but a) looked easy. b) looked harder.
Q5 was the simplest such problem I've ever seen.
Q6,Q7,Q8 I didn't look at, so I can't comment.
Q9a has appeared on papers before. Q9b was strangely phrased again, but easy.
Q10 was easier than the problems that appeared on Maths Paper 1 this year.

YouKnowNothing · 19-06-2015 1:08pm

Somehow managed to mess up 2b, other than that it should be OK

PotmBottom · 19-06-2015 1:09pm

expiiplus1 wrote: »

I maintain that it was the easiest exam in years.
Q1a was trivial and b wasn't much harder.
Q2 was a complete reversion to predictable format
Q3a was weirdly phrased, but the maths involved was predictable. Q3b was trivial
Q4 I didn't do, but a) looked easy. b) looked harder.
Q5 was the simplest such problem I've ever seen.
Q6,Q7,Q8 I didn't look at, so I can't comment.
Q9a has appeared on papers before. Q9b was strangely phrased again, but easy.
Q10 was easier than the problems that appeared on Maths Paper 1 this year.

I couldn't believe that Q10 I saw, I was so screwed if a standard part (a) came up, I always found those tough. It was so standard mathsy it was great.

Btw, is the distance the section between the two curves on the graph?

19-06-2015 1:10pm

for Q10bii
anyone get around 3000

PotmBottom wrote: »

I couldn't believe that Q10 I saw, I was so screwed if a standard part (a) came up, I always found those tough. It was so standard mathsy it was great.

Btw, is the distance the section between the two curves on the graph?

yep got the same thing

PotmBottom · 19-06-2015 1:12pm

2345 wrote: »

yep got the same thing

2845 I think I got for it, I thought it was just the C value of the equation that you ignore because you are using limits in Part Two?

19-06-2015 1:14pm

PotmBottom wrote: »

2845 I think I got for it, I thought it was just the C value of the equation that you ignore because you are using limits in Part Two?

i done C(160)-C(120)
but i dont know if that is right

expiiplus1 · 19-06-2015 1:18pm

Yep. I do economics, so I was delighted with 10b. Anybody else think that they seem to be making applied maths more applied? More project mathsy?

PotmBottom · 19-06-2015 1:20pm

expiiplus1 wrote: »

Yep. I do economics, so I was delighted with 10b. Anybody else think that they seem to be making applied maths more applied? More project mathsy?

I think it's because of the removal of Integration by substitution they are kind of stuck for questions now. I am no expert.

MmmPancakes · 19-06-2015 1:31pm

Kremin wrote: »

same.. i had like Cos^2A, converted it to Cos2A and then to Tan^2a+1 or something, i got a negative angle so I dont eve know.

I used u^2sin2a/g = 18.5, then found Sin2A = 0.07325 or something, then just solved it like you would in maths and got like 2 degrees and 88 degrees. I think it's wrong, but I derived the formula and then got 1 angle correct at least.. hopefully they don't crucify me lol

Q2 (a), what did ye get for the shortest distance? Also in 2(b) did anyone get the direction of the rain as 19 degrees?

expiiplus1 · 19-06-2015 1:36pm

New article : www.independent.ie/irish-news/education/exams/leaving-certificate-applied-maths-nearer-the-right-balance-this-year-31314804.html

my shortest distance was 0.64km or something like that

MmmPancakes · 19-06-2015 1:37pm

expiiplus1 wrote: »

my shortest distance was 0.64km or something like that

oh my

lads I think I might have scraped the B then, I was only looking to pass :')

Kremin · 19-06-2015 1:59pm

2345 wrote: »

yep got the same thing

Yeah at first i assumed the acceleration was constant but then i copped on integration was obviously required.

DarraghF197 · 19-06-2015 2:19pm

Found that the exam was really tough. Started off with Relative velocity at the start and I thought it would have been a damage limitation exam. However, as I progressed, it was better and better! Went back to my mistakes, fixed them, and hopefully an A1.

Question 1 was hard enough. It's usually my weakest so I was happy to see I got it out.
Question 2 was difficult for me. I always delayed equations until they're either directly East or North of eachother. Having no distances meant I had to improvise.
Question 3 was actually pretty fair. I completely forgot about the three metres at the start. Then redid it and worked out then (hopefully!).
I messed up a bit with question 4 part two of B. Forgot about the tension for forces up equal down.
Question 5 and 10 were really easy.

Doctorhopeful · 19-06-2015 2:32pm

DarraghF197 wrote: »

Found that the exam was really tough. Started off with Relative velocity at the start and I thought it would have been a damage limitation exam. However, as I progressed, it was better and better! Went back to my mistakes, fixed them, and hopefully an A1.

Question 1 was hard enough. It's usually my weakest so I was happy to see I got it out.
Question 2 was difficult for me. I always delayed equations until they're either directly East or North of eachother. Having no distances meant I had to improvise.
Question 3 was actually pretty fair. I completely forgot about the three metres at the start. Then redid it and worked out then (hopefully!).
I messed up a bit with question 4 part two of B. Forgot about the tension for forces up equal down.
Question 5 and 10 were really easy.

For Q2 (rel vel) the secod part was easy enough, A was 2km east of B when B was at the intersection. What did you end up doing? Probably over complicated it

Chickennuggets · 19-06-2015 3:22pm

Doctorhopeful wrote: »

For Q2 (rel vel) the secod part was easy enough, A was 2km east of B when B was at the intersection. What did you end up doing? Probably over complicated it

Was it not 1km east of b

Doctorhopeful · 19-06-2015 3:35pm

Chickennuggets wrote: »

Was it not 1km east of b

Nope, when B got to the intersection A had been travelling east at 60kmh for 2 minutes
2 minutes is 1/30th of an hour
1/30th of 60km is 2km

Chickennuggets · 19-06-2015 3:50pm

Doctorhopeful wrote: »

Nope, when B got to the intersection A had been travelling east at 60kmh for 2 minutes
2 minutes is 1/30th of an hour
1/30th of 60km is 2km

**** I only did it for 1 min Forget to multiply by 2 .

Benm123 · 19-06-2015 3:50pm

Could not be happier with that exam. I was so anxious about how it was going to go since I had put off studying it for the last week's to focus on other exams, and when I opened the paper I was like oh hell no this is horrible, and was beginning to settle for a C overall.

Started with Q4 as it's my best, which ironically turned out to be the hardest! It went well though, then moved onto Q5 which was piss, as was Q2, bar maybe a few mistakes, Q3a probably posed the greatest challenge but I figured it out and got it all out, bar maybe some minor slips. 3b was piss. Q10 seemed strange at first but turned out to be very simple and then Q1 went perfectly.

Was so worried that it was not going to go well and that I'd be on a serious downer finishing the LC, but now I couldn't be happier. B1 minimum or maybe an A1 if my slips weren't too serious.
Delighted!

DarraghF197 · 19-06-2015 5:28pm

Doctorhopeful wrote: »

For Q2 (rel vel) the secod part was easy enough, A was 2km east of B when B was at the intersection. What did you end up doing? Probably over complicated it

Oh wow, yeah I did overcomplicated it. I notice that I'm never up to speed with things at the start of an exam, and I've missed a pretty obvious thing there! I wasted a bit of time doing unnecessary work there, hopefully I still got the right answer (0.655km?)

KevStar · 19-06-2015 6:56pm

Could a kind soul post a scan of the paper?

I hope you all did well!

Peregrine · 19-06-2015 7:01pm

KevStar wrote: »

Could a kind soul post a scan of the paper?

I hope you all did well!

They're on examinations.ie

HL
OL

Pookla · 19-06-2015 7:16pm

AlfaJack wrote: »

hopefully i'll get the marks for the method :P

You absolutely will.

Best to put it all behind yerselves now and just remember that it's graded on a curve so it'll be fine.

PotmBottom · 19-06-2015 7:18pm

Pookla wrote: »

You absolutely will.

Best to put it all behind yerselves now and just remember that it's graded on a curve so it'll be fine.

I was going to ask, is it similar to the old maths course with the blunder minus 3 and then it's marked normally, like if an incorrect acceleration causes an incorrect tension is it still marked correct?

Pookla · 19-06-2015 7:22pm

PotmBottom wrote: »

I was going to ask, is it similar to the old maths course with the blunder minus 3 and then it's marked normally, like if an incorrect acceleration causes an incorrect tension is it still marked correct?

Yes. Slips lose one mark, blunders lose 3 and a trivial misreading loses 1.

Everything after the mistake is marked as if you were correct so you only lose marks once per mistake.

It's a very fairly marked exam tbh.

qweerty · 19-06-2015 8:55pm

A nice paper. But also, I think, quite "fair" (the favourite adjective of teachers reviewing the exam in national papers). The b-parts of 1 and 10 were definitely too easy, but overall it was a standard, if not particularly challenging, paper. At present, C and D students are generally picking up their marks from setting up questions and not from actually getting near to the answers. A paper such as this one allows them to get marks for proper engagement with questions, while retaining a certain level of difficulty to differentiate between A and B, IMO.

Doctorhopeful · 20-06-2015 2:23am

DarraghF197 wrote: »

Oh wow, yeah I did overcomplicated it. I notice that I'm never up to speed with things at the start of an exam, and I've missed a pretty obvious thing there! I wasted a bit of time doing unnecessary work there, hopefully I still got the right answer (0.655km?)

Yup, would've said I got about 0.64km but really anything arouns there is a matter of rounding :P out of curiosity, how did you go about working out working out that part?

lostatsea · 20-06-2015 2:34am

Question 3 (a) sums up that whoever is setting the papers has lost direction. Awful numbers right on the limit where you have an idea if you are right or wrong means your fate is in the hand of pure amateurs.

qweerty · 20-06-2015 10:14am

lostatsea wrote: »

Question 3 (a) sums up that whoever is setting the papers has lost direction. Awful numbers right on the limit where you have an idea if you are right or wrong means your fate is in the hand of pure amateurs.

It's not clear what your problem with it is. If you take away the picture (which makes it look like Project Maths) it's similar in style to the 2009 question.

dalta5billion · 20-06-2015 10:27am

The new guy was obviously given a slap on the wrist after last year - Q's much more approachable.

DarraghF197 · 20-06-2015 11:33am

Doctorhopeful wrote: »

Yup, would've said I got about 0.64km but really anything arouns there is a matter of rounding :P out of curiosity, how did you go about working out working out that part?

I don't fully remember but it was something like this:

I used s=ut and let the distance from A to the junction equal x. Then s=ut for B and got the distance in terms of X.

I then drew a relative velocity line from B to wherever it crossed A (this was a bit confusing as I thought it would intersect ahead of A rather than behind, which made it all that bit more messy!).

I used the triangle [point intersects A, junction, and B]. Was able to use the sine rule to find the point it intersects A line in terms of X.

Then subtracted that from x to get the distance the relative velocity line was from A. This gave me another triangle and I was able to find the shortest distance with the Sine of the angle between Relative Velocity line and A line.

I wonder if that makes any sense at all lol.

Kremin · 20-06-2015 1:54pm

dalta5billion wrote: »

The new guy was obviously given a slap on the wrist after last year - Q's much more approachable.

I guess I'm one of the only people who thought last years paper was a lot easier than this years :l

Applied Maths aftermath

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