**Applied Maths Before/After**

mulciber

Just thought I may as well start this thread. :P

How do you think you're going to do?

What do you think will come up?

Prodigious

Bit early, no? :P
Sure it's the same questions every year!

Aiming for A1, realistically looking at B1/A2.

MarieCurie22

I am so screwed....We had one class a week for two years and I did the bare minimum. It was an 8th subject so I didnt take it seriously...now Ii wish I had last minute tips ideally Id love any sort of B but i want at least a C1??

mulciber

MarieCurie22 wrote: »

I am so screwed....We had one class a week for two years and I did the bare minimum. It was an 8th subject so I didnt take it seriously...now Ii wish I had last minute tips ideally Id love any sort of B but i want at least a C1??

I'm the exact same. 1 class a week for 2 years and didn't take it seriously. =/

I'm hoping for a pass. :P

Undeadfred

Anyone feeling overly cocky?

Raeral

Undeadfred wrote: »

Anyone feeling overly cocky?

Not overly cocky, just very confident :P

Undeadfred

For those 'prove that mew is greater than or equal to x' questions in statics, is it ok to show that mew = x and then just go, 'therefore, mew is greater than or equal to x'

lostatsea

Undeadfred wrote: »

For those 'prove that mew is greater than or equal to x' questions in statics, is it ok to show that mew = x and then just go, 'therefore, mew is greater than or equal to x'

Yes. Prove the equality first - this is the point at which it is about to slip. For all values of mew greater than this it is stable.

Undeadfred

lostatsea wrote: »

Yes. Prove the equality first - this is the point at which it is about to slip. For all values of mew greater than this it is stable.

Do you have to say any of that though? can you do it without writing anything?

lostatsea

Undeadfred wrote: »

Do you have to say any of that though? can you do it without writing anything?

Yes

xJEx

Does anyone know what definitions we need to know? I know one only pops up VERY rarely, but i'd hate to lose marks for something like that or for it to cause me to avoid a question I like

Undeadfred

xJEx wrote: »

Does anyone know what definitions we need to know? I know one only pops up VERY rarely, but i'd hate to lose marks for something like that or for it to cause me to avoid a question I like

You could prob use your physics definitions

Prodigious

Could someone please explain what is happening for 5(b) 2008 on the mariking scheme, where he's doing Tan(alpha+45)?
Normally for the angle it's deflected through I would just use the tan(theta) formula in the logs, but when i did that I got the same answer with the wrong signs..
Thanks

lostatsea

Prodigious wrote: »

Could someone please explain what is happening for 5(b) 2008 on the mariking scheme, where he's doing Tan(alpha+45)?
Normally for the angle it's deflected through I would just use the tan(theta) formula in the logs, but when i did that I got the same answer with the wrong signs..
Thanks

The tan of the angle that A makes after collision is found by putting the coefficient of the j part over the i part (slope). This angle is equal to 45 degrees plus alpha, where alpha is the angle of deflection.
Therefore, tan(alpha + 45) = slope
Expand tan(alpha + 45) using the tan(A + formula in table book.

Monsieur Folie

When you look at the stats for this in August and see that one eejit failed, it'll be me.

I love this subject, I wish my school offered it! I foolheartedly took it on after the mocks and dove in getting a good 2-3 questions done but then as the teachers piled on the work my other subjects took priority and now I'm back to square one. Literally just looking to try and scrape myself over the 40% mark now.

xJEx

Monsieur Folie wrote: »

When you look at the stats for this in August and see that one eejit failed, it'll be me.

I love this subject, I wish my school offered it! I foolheartedly took it on after the mocks and dove in getting a good 2-3 questions done but then as the teachers piled on the work my other subjects took priority and now I'm back to square one. Literally just looking to try and scrape myself over the 40% mark now.

Why bother if youre not gonna count it?

Monsieur Folie

xJEx wrote: »

Why bother if youre not gonna count it?

I didn't know I wasn't going to count it when I started!

Also, I really enjoy it, I just haven't done much with it the last few weeks because I had said when I took it up that if time got tight I'd prioritise my other subjects, and that's what happened.. I'll do my damndest to pass it though!

Undeadfred

Monsieur Folie wrote: »

I didn't know I wasn't going to count it when I started!

Also, I really enjoy it, I just haven't done much with it the last few weeks because I had said when I took it up that if time got tight I'd prioritise my other subjects, and that's what happened.. I'll do my damndest to pass it though!

You prob will on attempt marks

Monsieur Folie

Undeadfred wrote: »

You prob will on attempt marks

That's the hope, I'm just going to go over the basics of a few questions and then tackle them the best I can, and hopefully going on the stuff I did back when I was putting in more effort I'll be able to get a few of the part (a) and hopefully attempt marks on some (b)'s which will be enough to pass. :P

Is Q8 the only one with a theorem yeah? I'm going to learn those since it'll guarantee me 25 marks if nothing else.

xJEx

http://thephysicsteacher.ie/Exam%20Material/AppliedMaths/pdf/Higher%20Level/Marking%20Schemes/2000.pdf

for the end of question 5 why is it tan (theta) = tan (beta - alpha)?

I have tan (theta) = tan (180 - (beta + alpha)) but I dont get how it gets to the above

Nl90

xJEx wrote: »

http://thephysicsteacher.ie/Exam%20Material/AppliedMaths/pdf/Higher%20Level/Marking%20Schemes/2000.pdf

for the end of question 5 why is it tan (theta) = tan (beta - alpha)?

I have tan (theta) = tan (180 - (beta + alpha)) but I dont get how it gets to the above

I'll tell what I know and hope it's correct
They are asking for the angle of deflection which is theta

It always equals (beta-alpha)
You get beta by letting Vy/vx
Alpha is the original angle
And then you just apply the trig
Tan (A-B)= bla bla bla "math table"

Hope that helped

xJEx

Nl90 wrote: »

I'll tell what I know and hope it's correct
They are asking for the angle of deflection which is theta

It always equals (beta-alpha)
You get beta by letting Vy/vx
Alpha is the original angle
And then you just apply the trig
Tan (A-B)= bla bla bla "math table"

Hope that helped

yeah thanks, I knew that though I just don;t get WHY its always beta - alpha

Nl90

xJEx wrote: »

yeah thanks, I knew that though I just don;t get WHY its always beta - alpha

I think if you draw it you'll understand it
It's very confusing for me too
You can say alpha was 30 and then the angle became 90 so what made the angle change from 30 to 90!? It's 60

I don't know if this is how the concept was explained because I studied it bymyself but it works

xJEx

Nl90 wrote: »

I think if you draw it you'll understand it
It's very confusing for me too
You can say alpha was 30 and then the angle became 90 so what made the angle change from 30 to 90!? It's 60

I don't know if this is how the concept was explained because I studied it bymyself but it works

But say alpha = 30 and theta = 70
that means beta must equal 80

so apparently tan(70) = tan(80-30)
according to formula but that isnt true

Prodigious

180 - alpha +theta = Beta

Nl90

xJEx wrote: »

But say alpha = 30 and theta = 70
that means beta must equal 80

so apparently tan(70) = tan(80-30)
according to formula but that isnt true

If alpha = 30
And theta is =70
Then beta must be 100

Alpha is the original direction
Beta is the new direction after deflecting
Theta is the difference
So Beta = alpha+theta
You need to know in the Q whether they're asking for B or theta

D_s

Nl90 wrote: »

I think if you draw it you'll understand it
It's very confusing for me too
You can say alpha was 30 and then the angle became 90 so what made the angle change from 30 to 90!? It's 60

I don't know if this is how the concept was explained because I studied it bymyself but it works

That works well!

To help visualise this, you can hold a ruler along the original line of velocity. Now turn it anti-clockwise until your ruler is in line with the new direction. Theta is just the angle that you just turned your ruler through

Helped for me visualising anyway, may seem retarded to everyone else :P

xJEx

Nl90 wrote: »

If alpha = 30
And theta is =70
Then beta must be 100

Alpha is the original direction
Beta is the new direction after deflecting
Theta is the difference
So Beta = alpha+theta
You need to know in the Q whether they're asking for B or theta

They all add up to 180..

JoeOBrien1

Does anyone know where I can find past mock papers for applied maths? I've done the past papers back to about 1999 and 1994&1995. I'd rather get some new questions than go over some of them again. Also I don't really want to do questions past 1999 they're not to similar to the newer papers.

decisions

JoeOBrien1 wrote: »

Does anyone know where I can find past mock papers for applied maths? I've done the past papers back to about 1999 and 1994&1995. I'd rather get some new questions than go over some of them again. Also I don't really want to do questions past 1999 they're not to similar to the newer papers.

There are some on the CBS Kilkenny moodle.

Cdawg95

What's formula for power for differential equations? Keeps slipping my mind

no scope codgod

Cdawg95 wrote: »

What's formula for power for differential equations? Keeps slipping my mind

P=Fv is a cheeky one they sometimes throw in

Prodigious

Would it be a good idea to leave the first page for your answers, and just list the answers there? Or would it come off as really arrogant?

D_s

Prodigious wrote: »

Would it be a good idea to leave the first page for your answers, and just list the answers there? Or would it come off as really arrogant?

I just clearly mark all my answers with a big box around each one. Same time-saving concept, less "arrogant" seeming. Although it's not really arrogant, per se, just, I dunno, might give a weird impression and why take the risk that it does come across as such? They're still gonna be looking at each page anyway.

decisions

I'm going to be leaving the 1st page blank so I have the full q over the 2 pages infront of me. I don't want to be ficking the page back and forth, it's such an easy way to make mistakes.

D_s

decisions wrote: »

I'm going to be leaving the 1st page blank so I have the full q over the 2 pages infront of me. I don't want to be ficking the page back and forth, it's such an easy way to make mistakes.

That's smart, I'm gonna be using this. Thank you.

no scope codgod

decisions wrote: »

I'm going to be leaving the 1st page blank so I have the full q over the 2 pages infront of me. I don't want to be ficking the page back and forth, it's such an easy way to make mistakes.

Ye they actually mentioned that in the Chief Examiner's Report when they last did it for Applied Maths, that lots of students were making mistakes transcribing answers from one page to the next.

xJEx

decisions wrote: »

I'm going to be leaving the 1st page blank so I have the full q over the 2 pages infront of me. I don't want to be ficking the page back and forth, it's such an easy way to make mistakes.

Oh my god that is actually so simple yet I probably never would have thought of doing that.. Thank you!!

JoeOBrien1

decisions wrote: »

There are some on the CBS Kilkenny moodle.

Thanks alot but did you notice there is a good few mistakes in his solutions?

decisions

JoeOBrien1 wrote: »

Thanks alot but did you notice there is a good few mistakes in his solutions?

Personally I tend not to need solutions, therefore don't care.

It's still a fantastic resource.

xJEx

What approach are y'all taking for this exam tomorrow? Just doing past papers? Or going through a book by topic? I don't know how to study for this subject and its been weeks since i've looked at it

OH, and how many questions is everyone considering doing? Like do you just have six or seven, or are you open to doing any of the ten?

decisions

I'm just doing a few questions.

Tomorrow I'm probably going to do 3,4,5,8,9 and either 1 or 10.

xJEx

decisions wrote: »

I'm just doing a few questions.

Tomorrow I'm probably going to do 3,4,5,8,9 and either 1 or 10.

Do you know how to do them all though? I was gonna prepare for 10 of them but I always seem to get Q6 and 7 wrong so i'm leaving them out. I'm practicing all of the other 8, a few each, but if theres the slightest chance loads of them are horrible and 6 or 7 are really easy i still know how to do them!
I'll probably do 3, 4, 8,10, and then two more out of 5, 2, 1 and possibly 9 if its a nice one

decisions

Yeh, I can do them all but I don't like 2, 1 is a little Bipolar, I tend to make stupid mistakes on 6, 7 is grand and 10 has been changed to something project mathsey.

decisions

In case people haven't seen it, the changes to 10 are outlined here.

Prodigious

decisions wrote: »

In case people haven't seen it, the changes to 10 are outlined here.

Fair play!

xJEx

decisions wrote: »

In case people haven't seen it, the changes to 10 are outlined here.

substitution isnt on it anymore but i still use it all the time

decisions

xJEx wrote: »

substitution isnt on it anymore but i still use it all the time

Prodigious

xJEx wrote: »

substitution isnt on it anymore but i still use it all the time

They're also making it more like project maths. If you read the link decisions posted, it gives examples of questions.

xJEx

decisions wrote: »

I mean you can still use substitution even though there are other methods to tackle certain questions

decisions

xJEx wrote: »

I mean you can still use substitution even though there are other methods to tackle certain questions

But that's not what I was talking about? Yes that is mentioned in the link but what I was actually pointing out was the examples of the Project Maths style questions.