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# AQA A2 Mathematics MM2B Mechanics 2 - Monday 22nd June 2015 [Exam Discussion Thread] watch

1. (Original post by 221loki)
Oh that makes so much sense thank you!!

So what would happen if it's right in the middle of the circle?
In that case it's only the reaction which provides the centripetal force as the weight is perpendicular meaning no component of the weight acts radially.

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2. (Original post by CD223)
In that case it's only the reaction which provides the centripetal force as the weight is perpendicular meaning no component of the weight acts radially.

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Oooh okay thank you!!
3. (Original post by 221loki)
Oooh okay thank you!!
No worries! How prepared do you feel ahead of Monday? Not sure how many more past papers to do

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4. (Original post by 221loki)
Oh that makes so much sense thank you!!

So what would happen if it's right in the middle of the circle?
It should just be R = mv^2/a right at the middle because the weight acts perpendicular to the centripetal force
5. (Original post by CD223)
No worries! How prepared do you feel ahead of Monday? Not sure how many more past papers to do

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I don't feel prepared to be honest I keep forgetting the basics and I've been putting off mechanics it's my worst exam I'm hoping for a similar paper to the 2014 one which was surprisingly more straightforward than any other past paper since like 2011

I'm trying to go as far back as 2005 but I'm also trying to do the madasmaths booklets as well so hoping that'll be enough
6. (Original post by FeelsToWaltz)
It should just be R = mv^2/a right at the middle because the weight acts perpendicular to the centripetal force
Okay thank you!!
7. Do people know of any papers I could attempt once I've done all AQA ones!?

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8. (Original post by CD223)
Do people know of any papers I could attempt once I've done all AQA ones!?

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You could try ocr or edexcel Solomon papers but I don't think they're as challenging as aqa
Maybe try madasmaths.com some of the questions are good use the maths booklets
9. (Original post by 221loki)
You could try ocr or edexcel Solomon papers but I don't think they're as challenging as aqa
Maybe try madasmaths.com some of the questions are good use the maths booklets
Oh cool, thanks!

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10. (Original post by CD223)
Oh cool, thanks!

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No problem
11. Could someone explain June 14 8)b) to me. The mark scheme is confusing.

It seems to state that
ΔGPE + WD = ΔEPE

But I always thought the method was:
Initial Energy - WD = Final Energy.

These two statements seems to contradict themselves?

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12. Anybody have tips for answering EPE questions?
Could someone explain June 14 8)b) to me. The mark scheme is confusing.

It seems to state that
ΔGPE + WD = ΔEPE

But I always thought the method was:
Initial Energy - WD = Final Energy.

These two statements seems to contradict themselves?

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Does this make sense?

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Could someone explain June 14 8)b) to me. The mark scheme is confusing.

It seems to state that
ΔGPE + WD = ΔEPE

But I always thought the method was:
Initial Energy - WD = Final Energy.

These two statements seems to contradict themselves?

Posted from TSR Mobile
there is no change in GPE if you take C to be the point with no GPE and so the so conserving energy would be:

Initial EPE = GPE + Final EPE + WD

ΔEPE=GPE + WD
15. (Original post by Tiwa)
Anybody have tips for answering EPE questions?
Always write down the energy of a body before and after the movement. Also, always draw a sketch, it helps so much with determining what the extension should be represented as when forming quadratics.

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16. (Original post by smilejensmile)
Attachment 432057

Is this the right answer for this? I feel like I've done something wrong... Sorry for my extremely poor hand writing, rushed it a bit since I'm tired but wanted to give it a shot :/
17. (Original post by tripleseven)

Is this the right answer for this? I feel like I've done something wrong... Sorry for my extremely poor hand writing, rushed it a bit since I'm tired but wanted to give it a shot :/
I believe that's correct
18. (Original post by tripleseven)

Is this the right answer for this? I feel like I've done something wrong... Sorry for my extremely poor hand writing, rushed it a bit since I'm tired but wanted to give it a shot :/
Haha, we all know the feeling buddy - so tired after all these exams

Anyway, that's correct

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19. (Original post by CD223)
Always write down the energy of a body before and after the movement. Also, always draw a sketch, it helps so much with determining what the extension should be represented as when forming quadratics.

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Thanks a lot!
20. Just done Jan 2013 and the last part of question 9 took forever to do I'm worried I'm not going to have enough time for a tricky 'show that' question

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