OCR MEI M2 13th Jan

paper wasn't actually that difficult, just had to use your initiative,
saying that i couldn't do the last 3 marker, prove tana = ...

First question was pretty easy ... the angle of the slope was shallow can't remember exactly

Second question - CoM ... was pretty easy aswell ... even though it was strange finding the angle wasn't too hard for both of them the last one (where it tipped)was like ... Tan-1(0.1/Z) can't remember what Z was but again it turned out to be a shallow angle ...

Third question - seemed to be one of the harder moment questions i done can only remember for the very last bit the angle of the T was at 19.1 or something 19 something and T was like 522??? something like that hense the co-eff of friction was just (522sin19.1/R). R was like ... 320?? so whatever that equals ... 0.533 or something like that ...

4th was alright but had to read 3 or 4 times to understand what the question was asking
went 0.02m into the wood, acceleration was like 20 something so the time was really short ..
The second part where they didnt stick together i can't remember it but i used simultaneous equations i remember them both going forwards still although that seemed strange ( worked out the mass to check to make sure it was correct )
the bouncing off the wall in terms of e and u was piece of cake ...
Then BAM tana=1/rte ... you had to use tana = 1/tan(90-a) but i didn't know that so probs lost the marks ... very last question was just as 1/tan(<45) = > 1 and e can't be above 1

HOPE I HELPED GUYS!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

paper wasn't actually that difficult, just had to use your initiative,
saying that i couldn't do the last 3 marker, prove tana = ...

First question was pretty easy ... the angle of the slope was shallow can't remember exactly

Second question - CoM ... was pretty easy aswell ... even though it was strange finding the angle wasn't too hard for both of them the last one (where it tipped)was like ... Tan-1(0.1/Z) can't remember what Z was but again it turned out to be a shallow angle ...

Third question - seemed to be one of the harder moment questions i done can only remember for the very last bit the angle of the T was at 19.1 or something 19 something and T was like 522??? something like that hense the co-eff of friction was just (522sin19.1/R). R was like ... 320?? so whatever that equals ... 0.533 or something like that ...

4th was alright but had to read 3 or 4 times to understand what the question was asking
went 0.02m into the wood, acceleration was like 20 something so the time was really short ..
The second part where they didnt stick together i can't remember it but i used simultaneous equations i remember them both going forwards still although that seemed strange ( worked out the mass to check to make sure it was correct )
the bouncing off the wall in terms of e and u was piece of cake ...
Then BAM tana=1/rte ... you had to use tana = 1/tan(90-a) but i didn't know that so probs lost the marks ... very last question was just as 1/tan(&lt;45) = &gt; 1 and e can't be above 1

HOPE I HELPED GUYS!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

I had a complete blank on the first question - I went from FP2 to this so while I was thinking about imaginary numbers I open the booklet and BAM... power. Went back to it after the other questions and it was pretty simple though

I agree with the angle of the slope being shallow... IIRC it was arctan or arcsin(3775/8000g)=2.76 degrees either way.

2nd question I didn't like that they didn't tell you the answer like they normally do... hopefully I didn't make any stupid mistakes! For the angle I got arctan(.1/1.2)=4.76 degrees I think...

3rd I think I got that, ~522N was the T I got for part ii) (with the coeff. friction being 0.55)... the last part I got an angle around 20 degrees (can't remember) and T was about 700N (can't believe they literally told you how to do the question!)

Managed to get the tan a bit after a bit of working backwards, the rest of the question was pretty straight forward I thought.

Looks like you did well though - well done

I had a complete blank on the first question - I went from FP2 to this so while I was thinking about imaginary numbers I open the booklet and BAM... power. Went back to it after the other questions and it was pretty simple though

I agree with the angle of the slope being shallow... IIRC it was arctan or arcsin(3775/8000g)=2.76 degrees either way.

2nd question I didn't like that they didn't tell you the answer like they normally do... hopefully I didn't make any stupid mistakes! For the angle I got arctan(.1/1.2)=4.76 degrees I think...

3rd I think I got that, ~522N was the T I got for part ii) (with the coeff. friction being 0.55)... the last part I got an angle around 20 degrees (can't remember) and T was about 700N (can't believe they literally told you how to do the question!)

Managed to get the tan a bit after a bit of working backwards, the rest of the question was pretty straight forward I thought.

Looks like you did well though - well done

You did FP2 and M2 together, how was that

Yeah i got 4.76 as well for angle just clicked as i read it. seems like we got similar answers so we probably both did pretty well ... i'm not doing FP2 until summer with M3 but i'm much better at Mechanics than Pure so i need to be getting high 90s in M2 and M3 if i want my A* cos probs will only manage low 80s in FP2

WHERE WERE FRAMEWORKS?!?!?!
Those were my guaranteed marks, i was banking on having full marks on one question.
I also needed a 90 in this - it's so not going to happen!

For the tana = 1/rte i didn't use tan(90-a) either
I got very confused though but eventually i got tana = 1/e.tana so tan^2a = 1/e
Did i go wrong on that too?

Although some of the answers people have posted are sounding familiar - hopefully grade boundaries will be low D:

Oh, and Q 2) when we were finding what IH (I think) makes to the vertical, did anyone get like 70 summet?
I thought it was strange, but I checked the maths and it seemed feasible?

I missed out the driving force on the first question otherwise I thought I did pretty well.

I feel your pain, I couldn't do the last 2 mark question of question 1, as soon as I got out the exam I realised how to do it, so frustrating!

meh, i should of only dropped 3marks or something and then another 3 marks for the penultimate question. otherwise, although it was dificult, i felt i answered most parts correctly, i reckon grade boundaries will be lowered as it was definitely one o the trickier paers i have encountered.