Edexcel A2 Mathematics: Mechanics M3 6679 01 - 16 May 2018 [Exam Discussion]

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niamhdoesmaths
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Edexcel A Level Maths Discussion Thread - 2018 Edition

Hey guys, I thought I'd make this niiiiiice and early so we can all share how we're preparing for our Maths exams this year?

Mechanics 3
Date: Wednesday 16th May 2018
Time: Morning
Duration: 1 hour 30 minutes
Days to go?: It's done! :woohoo:

Probably the most important way to prepare for maths is to do plenty of past papers! You can find all Edexcel Maths past papers here.

Also, Physics & Maths Tutor has some good resources for revision - everything from revision notes to questions on specific topics. Materials for M3 can be found here.

Good luck with the preparations everyone, let the countdown commence! Image

Other Edexcel Exam Threads:
Edexcel AS Core Maths C1
Edexcel AS Core Maths C2
Edexcel A2 Core Maths C3
Edexcel A2 Core Maths C4
Edexcel AS Mechanics M1
Edexcel A2 Mechanics M2
Edexcel AS Statistics S1
Edexcel A2 Statistics S2
Edexcel AS Decision Maths D1
Edexcel A2 Decision Maths D2
Edexcel AS Further Pure FP1
Edexcel A2 Further Pure FP2
Edexcel A2 Further Pure FP3
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Kocytean
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Ugh, I keep making silly mistakes and running out of time in M3 past papers, C grades all the way. I can get away with a C in this paper actually but it's not ideal. Could anyone suggest the hardest past papers to try, or any little tricks it might be handy to know?
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Shaanv
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(Original post by Kocytean)
Ugh, I keep making silly mistakes and running out of time in M3 past papers, C grades all the way. I can get away with a C in this paper actually but it's not ideal. Could anyone suggest the hardest past papers to try, or any little tricks it might be handy to know?
Definitely one of my harder exams, its a toss up between this and FP3.

If i think of any tips ill let u know
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Shaanv
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(Original post by Kocytean)
Ugh, I keep making silly mistakes and running out of time in M3 past papers, C grades all the way. I can get away with a C in this paper actually but it's not ideal. Could anyone suggest the hardest past papers to try, or any little tricks it might be handy to know?
You probably already do this but make sure u have a SEXY diagram!

It can clarify the problem nicely.
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username3555092
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(Original post by Shaanv)
Definitely one of my harder exams, its a toss up between this and FP3.

If i think of any tips ill let u know
My hardest A Level exam is definitely going to be D1.

(Original post by Kocytean)
Ugh, I keep making silly mistakes and running out of time in M3 past papers, C grades all the way. I can get away with a C in this paper actually but it's not ideal. Could anyone suggest the hardest past papers to try, or any little tricks it might be handy to know?
If going by how low the A* boundary is as an indication of paper difficulty, the "hardest" paper I've found is June 2013 reserve, which required 62/75 for A*.
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tiny hobbit
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(Original post by I hate maths)
My hardest A Level exam is definitely going to be D1.



If going by how low the A* boundary is as an indication of paper difficulty, the "hardest" paper I've found is June 2013 reserve, which required 62/75 for A*.
If by reserve, you mean (R), this was the paper for those at least 5 hours East of the UK.

There was also a Withdrawn paper that summer, when a packet of various Edexcel papers went missing in the Netherlands and all had to be replaced swiftly.
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username3555092
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(Original post by tiny hobbit)
If by reserve, you mean (R), this was the paper for those at least 5 hours East of the UK.

There was also a Withdrawn paper that summer, when a packet of various Edexcel papers went missing in the Netherlands and all had to be replaced swiftly.
Oops I do mean that one, sorry I think I just made up what the R stands for. Do you know why these papers are so much harder? Or are the boundaries lower for a different reason?
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tiny hobbit
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(Original post by I hate maths)
Oops I do mean that one, sorry I think I just made up what the R stands for. Do you know why these papers are so much harder? Or are the boundaries lower for a different reason?
The papers are written by the same team of examiners.

I think there is a much bigger spread of ability at M3 amongst those taking the R papers.

For June 2013:
Ordinary: A 62, 39.6 % of candidates. E 35, 87.5 % of candidates got E or better.
R: A 55, 29.7% of candidates. E 29, 71.6% of candidates got E or better.
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k92e67
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The IAL papers are very good to try. Have a go at Jan 2017 and June 2017 IAL papers. you can find them on PMT, if you can do those well you should have a good shot on wednesday
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tiny hobbit
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(Original post by k92e67)
The IAL papers are very good to try. Have a go at Jan 2017 and June 2017 IAL papers. you can find them on PMT, if you can do those well you should have a good shot on wednesday
They are also available on the Edexcel website, with June 2017 and older accessible without a password. There they come with the Examiners' Report, which can give useful hints.

https://qualifications.pearson.com/e...Exam-materials
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ndk123
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http://pmt.physicsandmathstutor.com/...%20Edexcel.pdf

can someone help me with question 2 b) please... i tried doing it the moments method but got a bit lost half way through...

i do understand the mark scheme method but was wondering if we could do it by moments too?

thank you and good luck!!
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k92e67
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(Original post by ndk123)
http://pmt.physicsandmathstutor.com/...%20Edexcel.pdf

can someone help me with question 2 b) please... i tried doing it the moments method but got a bit lost half way through...

i do understand the mark scheme method but was wondering if we could do it by moments too?

thank you and good luck!!
Just tried it, and I did it by taking moments. I thought that would've been the method they would have used but i guess not. My advice would be to just draw a huge diagram, label everything clearly and find the perpendicular distances from each of the 'masses' to the vertical. It works out pretty easily. have another go at it, i can give you my working if u still want it
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ndk123
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(Original post by k92e67)
Just tried it, and I did it by taking moments. I thought that would've been the method they would have used but i guess not. My advice would be to just draw a huge diagram, label everything clearly and find the perpendicular distances from each of the 'masses' to the vertical. It works out pretty easily. have another go at it, i can give you my working if u still want it
yes please, could you send me a picture of your working thank you!!
also would you mind helping me out in qu 2b) please! I really struggle with these type of questions

http://pmt.physicsandmathstutor.com/...%20Edexcel.pdf
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k92e67
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(Original post by ndk123)
yes please, could you send me a picture of your working thank you!!
also would you mind helping me out in qu 2b) please! I really struggle with these type of questions

http://pmt.physicsandmathstutor.com/...%20Edexcel.pdf
pm'd you
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boodledoodle123
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(Original post by k92e67)
The IAL papers are very good to try. Have a go at Jan 2017 and June 2017 IAL papers. you can find them on PMT, if you can do those well you should have a good shot on wednesday
I've just had a go at the June 2017 IAL - do you know how to do 7a? I get it up until the last three marks on the MS.
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k92e67
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(Original post by boodledoodle123)
I've just had a go at the June 2017 IAL - do you know how to do 7a? I get it up until the last three marks on the MS.
They tell you P passes through A. This means P completes a vertical circle so T is greater than or equal to 0 at the top. (1)

Setting T >= 0, you can get an inequality for V (speed at A) (using your equation with T and v) (2)

Now use conservation of energy to find the speed of P at A (V). Now that you have V, use the inequality you got from step (2) to get an inequality with e in it. Here your answer should simplify to the given result.
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username3555092
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Good luck everyone!!
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MathQS
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(Original post by I hate maths)
Good luck everyone!!
Have you got any tips for circular motion? Especially vertical circular motion.

Also, do you mind missing out a mark or two to lower the grade boundaries for people like me who started learning the module last week
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(Original post by k92e67)
They tell you P passes through A. This means P completes a vertical circle so T is greater than or equal to 0 at the top. (1)

Setting T >= 0, you can get an inequality for V (speed at A) (using your equation with T and v) (2)

Now use conservation of energy to find the speed of P at A (V). Now that you have V, use the inequality you got from step (2) to get an inequality with e in it. Here your answer should simplify to the given result.
OMG I just did it!! Thank you so much
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username3555092
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(Original post by MathQS)
Have you got any tips for circular motion? Especially vertical circular motion.
Energy conservation, looking at the forces at the top of the circle and sometimes the bottom (these are the two important points usually), T>0 or R>0 should get you places.

And don't forget if the particle is attached to a rod you can't use T>0 condition for circular motion since rods don't go slack, the tension doesn't have much to say, look at using v>0 at the top of the circle instead.

That's about what I remember off the top of my head, good luck.

Edit to your edit: I'm self teaching M3 and basically started properly doing papers last week as well, we're in the same boat.
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