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# OCR (non mei) M2 Wednesday 18th May 2016

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• View Poll Results: Raw marks for 90 UMS
60
63.75%
61
6.25%
62
16.25%
63
6.25%
64
3.75%
65
1.25%
66
5.00%

1. For the last part to the last question, did P have no horizontal velocity and after the collision? Because the question said it just fell vertically or something, allowing us to use e to find the speed of Q (horizontally), right?
2. (Original post by Abscissa)
For the last part to the last question, did P have no horizontal velocity and after the collision? Because the question said it just fell vertically or something, allowing us to use e to find the speed of Q (horizontally), right?
Yeah, that's what I thought as well. it said "Immediately after the collision P falls vertically." So yeah, I think it is a correct assumption.
3. (Original post by Miningstew)
Yeah, that's what I thought as well. it said "Immediately after the collision P falls vertically." So yeah, I think it is a correct assumption.
There is a god, THERE IS A GOD, I REPEAT, THERE IS A ****ING GOD.
What did you get for the horizontal speed of Q at the start, 19 something? I forget
4. (Original post by Abscissa)
There is a god, THERE IS A GOD, I REPEAT, THERE IS A ****ING GOD.
What did you get for the horizontal speed of Q at the start, 19 something? I forget
I got 5.6m/s before collision, then 15.6 m/s afterwards.
5. I need the Hitler reacts video to heal my pain. Anyone know if it's up somewhere yet?
6. (Original post by Muzzles)
Xsanda’s solutions:

1) Car on a plane:
i) v = 22.5 m/s
ii) P = 35.9 kW

2) Particle up a plane:
i) Wd = 8.43 J
ii) v = 10.8 m/s

3 Arch shape:
i) show that: 13a/3π
ii) T = 8.82 N
iii) θ = 10.9º left of upwards vertical

4 Particle around a cone:
i) show that m/6 (2 sqrt3 g - 3 a ω²)
ii) T = 39.6N, V =1.19 m/s

i) show that 5W/24 (1+6x/a)
ii) max x = 1.7a
iii) tan = 39/14

6 collisions horizontally:
i) a: 5.5 m/s, b: 8 m/s, both in opposite direction to their original motion
ii) e=3/4

7 projectiles:
i) 18.8m high, 61.1 m AB
ii) 87.3 Ns
iii) 11.9 m

I agree with most of this accept Q5 iii) which I think should be tan(a)=12/5 and Q6 ii) is not exactly e=3/4 as this is calculated from the rounded values in the previous part, however I doubt anyone can remember the actual value. Good work overall though, props to you for remembering all of this.
Does anyone know what the mark breakdown was ?
7. (Original post by Fp3)
Does anyone know what the mark breakdown was ?
Check the previous page
8. I was talking to Muzzles and what I mean is that xsandas solution for tan(a) = 39/14 is correct. for 5 (iii)

F = uR = 1/3 * 7W = 7/3 W

M(A) 6W * 2 cos(a) + W * 1 cos(a) = 2 * Fsin(a) = 2 * 7/3W sin(a) = 14/3W sin(a)

13W cos (a) = 14/3 W sin(a)

tan(a) = 13W / (7/3) W = 39/14
9. Hey folks, a few questions and thoughts. This was by far the trickiest M2 paper I have done, despite me knowing how to do most questions. I ****ed up the tension in 3 part 2, but I am pretty sure I got the method right in part 3, would I still get marks for that? Also how many of you finished? I got to the last part of question 7, fully knowing what to do, and my time ran out! Really pissed me off because I lost 9 marks for nothing ;( For some reason I spent more than normal time on some 3 markers.
10. Would somebody mind explaining for me what the UMS requirements are for A* in Maths and A* in Further Maths? In maths, do I simply need to get an A overall, then 90 UMS average in C3 C4, and for further maths, do I simply need an A overall, and 90 UMS average over 3 of my A2 modules (I'm taking M2, S2, FP2, FP3). So, in the case that I did not get 90 UMS in M2 (but got an A), then it would be wise to make M2 my normal maths module, so I have C3 C4 M2, then, I simply need 90 UMS average over c3 c4. And then for further maths I will have FP2 FP3 S2, for which I need 90 UMS average across, correct?
11. Has anyone got the details for question 2(ii)? Like the speef at B, the distance AB and the angle
12. (Original post by TheBride)
I need the Hitler reacts video to heal my pain. Anyone know if it's up somewhere yet?
I don't have a channel, but if anyone wants to do us all a favour.

http://downfall.jfedor.org/

First exam and already rip FM A*, why OCR why?!, unless I'm godlike in FP2, 3 and S2.
13. (Original post by Abscissa)
Would somebody mind explaining for me what the UMS requirements are for A* in Maths and A* in Further Maths? In maths, do I simply need to get an A overall, then 90 UMS average in C3 C4, and for further maths, do I simply need an A overall, and 90 UMS average over 3 of my A2 modules (I'm taking M2, S2, FP2, FP3). So, in the case that I did not get 90 UMS in M2 (but got an A), then it would be wise to make M2 my normal maths module, so I have C3 C4 M2, then, I simply need 90 UMS average over c3 c4. And then for further maths I will have FP2 FP3 S2, for which I need 90 UMS average across, correct?
Correct, that's what I am doing. I got 98 in S2 and well...less in M2 so I am pretty sure you can switch em around.
14. (Original post by Abscissa)
Would somebody mind explaining for me what the UMS requirements are for A* in Maths and A* in Further Maths? In maths, do I simply need to get an A overall, then 90 UMS average in C3 C4, and for further maths, do I simply need an A overall, and 90 UMS average over 3 of my A2 modules (I'm taking M2, S2, FP2, FP3). So, in the case that I did not get 90 UMS in M2 (but got an A), then it would be wise to make M2 my normal maths module, so I have C3 C4 M2, then, I simply need 90 UMS average over c3 c4. And then for further maths I will have FP2 FP3 S2, for which I need 90 UMS average across, correct?
Wait, you can switch em around right?
15. (Original post by 16characterlimit)
I don't have a channel, but if anyone wants to do us all a favour.

http://downfall.jfedor.org/

First exam and already rip FM A*, why OCR why?!, unless I'm godlike in FP2, 3 and S2.
Will give it a go later XD
16. (Original post by TheBride)
Will give it a go later XD
Lool let me know when its up
17. (Original post by John Snow2)
This was mad hard! A violation of the geneva convention imo.
I've been get 68-72 in all past papers but this... I didnt finish last question.
I got e = 1/72 but i think thats wrong.
The semicircular C.O.M. Question anyone: Were they wired arcs or a full on lamina? I never got the final answer :/

Posted from TSR Mobile
yep, it was a lamina.

I read it as arcs too and went through it twice before I noticed it said lamina.
18. outstanding
19. Paper wasn't particularly difficult, no fundamentally new questions, just old questions with new numbers and a different perspective. Just the timing was very tight, the ladder and KE-lost-collision questions required way more time than the marks they were worth would suggest. Got 69 or 70/72, depends how many marks I lost on 5(iii) for writing arctan(39/14)=70.3' rather than tan(alpha)=39/14. Surprised so many people reckon 60/72 for 90UMS, thought it'd be 65 or so, hopefully I'm wrong and everyelse is right though. Just depends on how many struggled with the timing!

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