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

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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

Reply 181

khaleesi98

Original post by boredom07

Good luck everyone. Just to double check - is it an afternoon exam?

Yes x good luck to you too!

Reply 182

Datta10

Original post by khaleesi98

Yeah that's exactly it x

Thank you :-)
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Reply 183

OldMathsAccount

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

Reply 184

icecreamcake

Original post by Themathgeek

Hardest m2 paper?

Last one before the exam? Anyone?

The IAL papers

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Reply 185

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?

Reply 186

Music With Rocks

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

Reply 187

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.

EDIT: I have managed to answer it now, so disregard :smile:

(edited 7 years ago)

Reply 188

Sainsbizz

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 :smile:

How do you do it please?
Thanks in advance !! :wink:

Reply 189

Music With Rocks

Original post by Sainsbizz

How do you do it please?
Thanks in advance !! :wink:

Here you go, hopefully it is clear enough

Reply 190

veldt127

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/a-level-maths-papers/m2-edexcel-bronze-silver-gold/

Reply 191

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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Reply 192

candol

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

Reply 193

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?

Reply 194

CaiusMartius

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).

Reply 195

candol

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

Reply 196

Reda2

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)

Reply 197

candol

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

Reply 198

k.russell

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

Reply 199

saitama kun

guys fuk yah my exams r over
da paper somewat easy except fr da last question which made da whole paper *****y somehw i gt d=0.3
saitama over n out
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always wanted to do dis😂