# Edexcel M4 Exam Discussion Thread [June 5th]Watch

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4 years ago
#101
(Original post by cogito.)
Self studied M1-5, didn't encountered that problem before in M2. Anyway i'll have a check on textbooks.
well it is the same in M4

there is momentum exchange ONLY in the direction of the lines joining the centres of the spheres on impact.
Therefore
the restitution law is to be applied in the components of the velocities in that direction only.
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4 years ago
#102
(Original post by cogito.)
Self studied M1-5, didn't encountered that problem before in M2. Anyway i'll have a check on textbooks.
Lol it is a whole chaper in M2. Ia ssume you did edexcel M2 ofcourse.
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4 years ago
#103
I figured it out, painfully. Of course i understand the content or otherwise i won't do M5. I just don't understand why sometimes w-v not v-w if we don't know which one is bigger.
Now i understand it because of common sense that later one must be bigger or balls will become stick together.

(Original post by physicsmaths)
Lol it is a whole chaper in M2. Ia ssume you did edexcel M2 ofcourse.
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4 years ago
#104
I understood Relative Motion when I first learnt it months ago. I didn't practise it enough so I pretty much forgot it, and now I'm in relative motion hell . I hope the relative motion question this year is easy.
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4 years ago
#105
(Original post by ThatPerson)
I understood Relative Motion when I first learnt it months ago. I didn't practise it enough so I pretty much forgot it, and now I'm in relative motion hell . I hope the relative motion question this year is easy.
Well ,the relative motion questions are usually the difficult questions in the paper.Luckily M4 has lower grade boundaries than any other unit (except of M5)
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4 years ago
#106
the last two are for C3,C4 not for M4.
I 'll try them later. Thank you
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4 years ago
#107
(Original post by Vesniep)
Well ,the relative motion questions are usually the difficult questions in the paper.Luckily M4 has lower grade boundaries than any other unit (except of M5)
The problem is that I'm aiming for 90+ UMS so I can secure the A* in FM before next week, which while reduce the pressure for my later exams significantly. Relative motion is the only obstacle to that.
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4 years ago
#108
(Original post by ThatPerson)
The problem is that I'm aiming for 90+ UMS so I can secure the A* in FM before next week, which while reduce the pressure for my later exams significantly. Relative motion is the only obstacle to that.
If you are having problems with diagrams this close to the exam then possibly focussing on a vector approach is your best bet. If you prefer geometrical methods maybe try going over the past papers/questions you've already done and just draw the diagrams and check them against the mark scheme. Won't take long and honestly is 80% of the work but takes a minute per question.

Luckily with relative motion almost all questions are incredibly similar (interception, closest approach, 'two hikers' or crossing a river).
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4 years ago
#109
Will someone post the unofficial MS after exam?
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4 years ago
#110
(Original post by ThatPerson)
The problem is that I'm aiming for 90+ UMS so I can secure the A* in FM before next week, which while reduce the pressure for my later exams significantly. Relative motion is the only obstacle to that.
Yeah, the only thing I struggle with in m4 is relative motion (and making stupid errors on the collision questions). Sometimes I get RM questions straight away but other times I'm just like da***
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#111
(Original post by Gome44)
Yeah, the only thing I struggle with in m4 is relative motion (and making stupid errors on the collision questions). Sometimes I get RM questions straight away but other times I'm just like da***
Try the one in June 2012, it's the hardest I've seen yet.
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4 years ago
#112
(Original post by Gome44)
Yeah, the only thing I struggle with in m4 is relative motion (and making stupid errors on the collision questions). Sometimes I get RM questions straight away but other times I'm just like da***
I find the problems that involve vectors and or very basic diagrams fine, but I've looked at a few exam questions and then the corresponding diagrams in the mark schemes and I'm just like fml.
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4 years ago
#113
(Original post by simonli2575)
Try the one in June 2012, it's the hardest I've seen yet.
Oh yes ,it is.But you could solve it with algebra,though it was not obvious.I tried to solve it with geometry and it was horrible (such time consuming process)
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4 years ago
#114
(Original post by ThatPerson)
I find the problems that involve vectors and or very basic diagrams fine, but I've looked at a few exam questions and then the corresponding diagrams in the mark schemes and I'm just like fml.
Two things :
Mark schemes in M4 are awful, because they rarely put alt.methods and are vague.
What is fml ? I only know shm,nel and suvat,but think it is kind of wtf.
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#115
(Original post by Vesniep)
Two things :
Mark schemes in M4 are awful, because they rarely put alt.methods and are vague.
What is fml ? I only know shm,nel and suvat,but think it is kind of wtf.
F*** my life.
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4 years ago
#116
(Original post by ThatPerson)
The problem is that I'm aiming for 90+ UMS so I can secure the A* in FM before next week, which while reduce the pressure for my later exams significantly. Relative motion is the only obstacle to that.
Me too(M3 90,Fp2 100). How did you do in FP2, M3? M4 is not the best unit to rely on (you can aim for A* but not be sure)
If you have M2 and/or FP3 it is better to think of getting a good mark in these units,in my opinion( they are safer)
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4 years ago
#117
(Original post by simonli2575)
F*** my life.
Hmmm,nice....really nice
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4 years ago
#118
(Original post by simonli2575)
Try the one in June 2012, it's the hardest I've seen yet.
Which one. I did both yesterday. I like the first one because you could use I and j vectors, as the angles were nice

Posted from TSR Mobile
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#119
(Original post by Gome44)
Which one. I did both yesterday. I like the first one because you could use I and j vectors, as the angles were nice

Posted from TSR Mobile
The one where you are required to find the speed of B.
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4 years ago
#120
(Original post by simonli2575)
The one where you are required to find the speed of B.
This one?
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