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Edexcel M2 - 28/01/11

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Reply 80

AndersonsBentFoot

will we get penalised if we dont give answers to a certain no. of significant figures?

Reply 81

ViralRiver

Hmm, I found the June '02 paper, but the edexcel website says that the mathematics thing was introduced in 2004... does this mean these '02 papers are legacy and I should stay clear of them?

Reply 82

anradu

Original post by Arsey

I haven't taught it for 6/7 years or so. I am thinking of giving myself an A2 FM group next year as I am getting rusty.

If your M1 knowledge is sound, M2 really isn't that much more difficult.

On the CoM questions, check carefully it isn't a shape made from rods rather than a solid. Also practise the toppling/hanging parts, they always seem to cause the most problems (is toppling on M2?)

Toppling is still in M2 - but it is lightly covered.
There's a Solomon paper with a toppling question - that's the nearest I've seen

Reply 83

ViralRiver

According to the spec we need to be able to do centres of mass questions where the lamina may be free to rotate about a horizontal axis.... any past paper questions or help with this?

Reply 84

Arsey

Original post by AndersonsBentFoot

will we get penalised if we dont give answers to a certain no. of significant figures?

never go beyond 3sf if the answer involves g

Reply 85

CapsLocke

omg jan 04 7 d !!

can someone explain this to me

how are they taking moments like this??

isn't it force x perpendicular distance, argh

is there an easier method

centre of mass question btw

M2 2004-01.pdf155.3KB

M2 2004-01 MS.pdf97.3KB

Reply 86

MC8

They have taken moments about O and it is force x perpendicular distance.

The weight of the lamina (10mg) acts at point G (centre of mass) which is at a distance 2.25a from AD. As O is at a distance 2.5a from AD, the perpendicular distance is a/4

So 10mg(a/4) = P(2a)
(force P acts horizontally, in line with CD, so the perpendicular distance is 2a)

therefore P= 10mga/8a
= 5/4(mg) as required

as for an easier way, drawing new diagrams helps, and read the questions for which direction the force acts etc. GL everyone for tomorrow!

Reply 87

snowflakesblues

Good Luck Everyone!!!! :biggrin:

Only 3 and a half hours left!!!!

Reply 88

6761

are there anybody doimg M2 today?

Reply 89

Ajka

Original post by 6761

are there anybody doimg M2 today?

Done and dusted! :biggrin:

Reply 90

6761

Are there anybody have the mark scheme for this paper?

Reply 91

sete

Original post by Ajka

...

I would delete your post, your not supposed to discuss the exam till 12pm.

Reply 92

Ultimate1

People no discussion before 12 am.

Reply 93

Shortduct

Good luck on the result - and remember, no discussion for a while (message at the top of the thread...)

when can we discuss?

Original post by 6761

when can we discuss?

According to this, you have to wait until "12:00 AM - Midnight (GMT)" for a morning exam.

Reply 96

The Lolly Pop Guy

Does anyone have the solutions?

Reply 97

CapsLocke

Okay here are my answers to M2, I'm not entirely sure on these answers so don't take my word for it.

1. a) v = 12
b) a = 4/45 = 0.0889

2. a) 29 J

3. a) t^4 - 6t^2 + 8
b)1/5 t^5 - 2t3 + 8t
c) t = 2, t = 1.41 = root 2

4 a) couldn't do it
b) 10.24

5 a) 11, 11
b) 24

Not sure about question 6, could someone confirm if this is right?
6 a) .. prove
b) 2.03
c) v = 3i + (5-9.8)t
d) 0.204
e) 3root2

7. mew = 0.514

8 a) prove m = 4
b) v = 2/9 therefore moving towards the wall.

(edited 13 years ago)

Reply 98

Ultimate1

OK here's from what I can remember:

Centre of mass Q : 12.3 and 12.9 and the angle was 28
Last Q: the velocity you got was 2/9 which was in the positive direction and hence it hit the wall again.
For the vlocity question where the particle was 10 m above the cliff I was 2.03s and 0.2 seconds for the time Q's and got 3root2 as the value of v (Obviously wrote that as decimals which was 4. something)
For the other projectile Q I got t as root4 and root2 (Again wrote these as decimal)
For the Q where the box was dragged from A to B I remember putting down 8400 or something like that and the speed as 10 ms-1 (Rounded to 2 sf) when it passed b.
I think I got the KE energy one wrong though as I got 3 J but I worked out KE lost which you weren't meant to :facepalm: