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OCR MEI M1 June 12th

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Reply 20

username1160544

Thoughts? Personally thought that exam was fairly difficult, certainly more so than previous years.

I liked it???

I have mixed feelings. Talking to people after the exam, I think I tackled the questions in the right way but made silly mistakes in the last question of section B and so have incorrect answers in some places.
For example, I got the tension in the coupling to be 1300N both at the beginning AND end, but everyone else got 2300N, so I must have added the 500N resistive force on the wrong side both times

Train wreck.

Original post by lauratheexplorer94

Train wreck.

Section A or B? Or both? :frown:

Reply 25

abdcefghi

Some of the answers I stored are:

1i) @ t=4 s=20
@ t=18 s=150
ii) Draw graph, curved ends and straight mid section

2i)Show that parallel ends up factorising to like 3.5(8i-j) so parallel
ii) j components cancel giving 196i therefore horizontal
iii) show k=-4 and m=2.5

3i) Triangle of forces
ii) R=Wcosa
S=Wsina or the other way round
iii) show cosa and sina on same graph, a>45

5i) show 5 secs, then ball lands 3.4m away

5i)show t=4
ii) 400000
iii) 150000

6i)speed=11.2
angle 26.6
rest of question showing stuff

7) various answers including a=0.06
T=2300
distance=1000
New T=1000 in compression
angle 0.35

Not everything but yeah most of the stuff (not necessarily correct) :biggrin:

(edited 9 years ago)

Reply 26

lauratheexplorer94

Question 3 and the fiddly bits of 6 and 7.

Reply 27

username1066741

Original post by lauratheexplorer94

Train wreck.

Nice pun considering the last question, but I'm guessing you weren't going for a joke...

Q3 really boned me, I hated it!

Reply 28

_Caz_

I think it was a pretty bad paper as a few people came out of the exam in tears at my college. I was just lucky I think because there was f=ma all over the last question and I love love love vectors.

Reply 29

DJR_12

Original post by abdcefghi

Some of the answers I stored are:

1i) @ t=4 s=20
@ t=18 s=150
ii) Draw graph, curved ends and straight mid section

2i)Show that parallel ends up factorising to like 3.5(8i-j) so parallel
ii) j components cancel giving 196i therefore horizontal
iii) show k=-4 and m=2.5

3i) Triangle of forces
ii) R=Wcosa
S=Wsina
iii) show cosa and sina on same graph, a>45

5i) show 5 secs, then ball lands 3.4m away

5i)show t=4
ii) 400000
iii) 150000

6i)speed=11.2
angle 26.6
rest of question showing stuff

7) various answers including a=0.06
T=2300
distance=1000
New T=1000 in compression
angle 0.35

Not everything but yeah most of the stuff (not necessarily correct) :biggrin:

I think I may have got my angle on the wrong side for Q3 and consequently get the opposite equations to you (R = Wsina, S = Wcosa).
Also, I messed up on the train question. That was the LAST kind of question I wanted/needed in section B.
Why couldn't they have given us an equations of motion?!

Reply 30

BoigaDendrophila

Really enjoyed that, not too bad at all, but I did the m2 and m3 exams , so this was bound to be easier.

Reply 31

Bisland

What was the answer for that 7 marker in section B????

Reply 32

DJR_12

Original post by Bisland

What was the answer for that 7 marker in section B????

The one about finding the distance the train takes to come to a rest? And then find the new tension in the coupling??

Reply 33

username1066741

Original post by abdcefghi

Some of the answers I stored are:

1i) @ t=4 s=20
@ t=18 s=150
ii) Draw graph, curved ends and straight mid section

2i)Show that parallel ends up factorising to like 3.5(8i-j) so parallel
ii) j components cancel giving 196i therefore horizontal
iii) show k=-4 and m=2.5

3i) Triangle of forces
ii) R=Wcosa
S=Wsina
iii) show cosa and sina on same graph, a>45

5i) show 5 secs, then ball lands 3.4m away

5i)show t=4
ii) 400000
iii) 150000

6i)speed=11.2
angle 26.6
rest of question showing stuff

7) various answers including a=0.06
T=2300
distance=1000
New T=1000 in compression
angle 0.35

Not everything but yeah most of the stuff (not necessarily correct) :biggrin:

I drew curved ends on the graph in question 1, but have been told since its wrong and they should have been straight?

Reply 34

Bisland

Original post by DJR_12

The one about finding the distance the train takes to come to a rest? And then find the new tension in the coupling??

Yeah

Reply 35

_Caz_

55 for an A? That's my stab at what the grade boundary is it is probably way off I'm so bad at predicting these things.

Reply 36

DJR_12

Original post by Bisland

Yeah

Well everyone seems to be saying it was 1000m distance,
not sure about the tension.
But I did it wrong. Not sure where I went wrong, but I managed to get 2500m? Must've made a mistake in my equations :mad:

Reply 37

Genty Boy

That was a cruel, cruel test, especially question 6 with the 3d vectors. Loads of people found it hard, expecting the grade boundaries to be low. I've done every M1 past paper and got 60-72, but this test was something else... I don't think I have even got 50 today. Disappointed and frustrated :mad: