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# Edexcel AS/A2 Mathematics M2 - 17th June 2016 - Official Thread watch

1. Good luck everyone. Just to double check - is it an afternoon exam?
2. (Original post by Datta10)
Is the work energy principle final energy = initial energy +or- wprk done againt friction? And if so then do you plus when energy increases amd minus when decreases?

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Yeah that's exactly it x
3. (Original post by boredom07)
Good luck everyone. Just to double check - is it an afternoon exam?
Yes x good luck to you too!
4. (Original post by khaleesi98)
Yeah that's exactly it x
Thank you :-)
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5. (Original post by Datta10)
Is the work energy principle final energy = initial energy +or- wprk done againt friction? And if so then do you plus when energy increases amd minus when decreases?

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Think about it like this: you have a final energy and an initial energy, but in these questions the total energy remains constant (obviously unless there's an impulse). So picture the particle at the start with its energy, and what it does to get into the final position.

So if a particle is down a rough slope and is going up the slope, it has an initial kinetic energy, and at the end it has done work against friction and against gravity, and if it's still moving will also have a KE. So it would look like this:

initial ke = final ke + work done against gravity (gpe) + work done against friction
6. (Original post by Themathgeek)
Hardest m2 paper?

Last one before the exam? Anyone?
The IAL papers

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7. In this formula/equation "Initial KE + Initial PE + Energy Created - Energy lost = final KE + Final PE" what is PE? Is it mgh? What would Initial and Final PE be then?
8. (Original post by Nirm)
In this formula/equation "Initial KE + Initial PE + Energy Created - Energy lost = final KE + Final PE" what is PE? Is it mgh? What would Initial and Final PE be then?
Yes PE would be GPE (gravitational potential energy) which is equal to mgh
9. Could anyone show me how to do this rhombus question from Jan 2015 IAL?
The model answers on Physics and maths tutor are very brief so any help would be appreciated.

EDIT: I have managed to answer it now, so disregard
10. (Original post by Music With Rocks)
Could anyone show me how to do this rhombus question from Jan 2015 IAL?
The model answers on Physics and maths tutor are very brief so any help would be appreciated.

How do you do it please?

EDIT: I have managed to answer it now, so disregard
How do you do it please?
11. (Original post by Sainsbizz)
How do you do it please?

Here you go, hopefully it is clear enough
12. (Original post by Themathgeek)
Hardest m2 paper?

Last one before the exam? Anyone?
Gold 3 and 4; 4 is the harder one

http://www.physicsandmathstutor.com/...e-silver-gold/
13. I'm having trouble with b and c. I'm not sure if I've done the right thing for b

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14. (Original post by pineneedles)
I'm having trouble with b and c. I'm not sure if I've done the right thing for b

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I got the same
15. Guys, just a quick question. In the image attached can you just please tell me in which way the reaction force R is acting on the rod?
16. (Original post by Reda2)
Guys, just a quick question. In the image attached can you just please tell me in which way the reaction force R is acting on the rod?
To my understanding, I thought you wouldn't know which direction (you would have to split into horizontal and vertical components).
17. (Original post by Reda2)
Guys, just a quick question. In the image attached can you just please tell me in which way the reaction force R is acting on the rod?
you can normally split the reaction in 2 perpendicular components
18. (Original post by CaiusMartius)
To my understanding, I thought you wouldn't know which direction (you would have to split into horizontal and vertical components).
Can you please give me a visual example?
Im referring to this question, which way is Y? (attached)
19. (Original post by Reda2)
Can you please give me a visual example?
Im referring to this question, which way is Y? (attached)
Y is vertical at the wall.
To solve.
Take moments at the wall and resolve vertical forces.
Sub one answer into the other to get their solution
20. Just a quick question, not very significant and not much time for people to reply anyway but;
When you have an impulse expressed in vector form i.e. I = m/2(8i+5j) and you want to find the magnitude, is it correct to mod the bracket then halve, or halve the bracket then mod as I have seen it done both ways - mod then half in M2 Solomon F q1 and half then mod in a Madas Maths booklet on impulse - depending on which way you do it, you get a different answer so I was hoping someone might have an idea thanks

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