MEI OCR Mechanics 3 - 25/05/2016 A.M. Watch

chemari1
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I hadn't seen a thread abut this exam so there's that. In question 2, what was the amplitude?
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bellacutie
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I got 0.2 i think. What dod you get for the last 2 parts of the paper i couldnt get them at all
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chemari1
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(Original post by bellacutie)
I got 0.2 i think. What dod you get for the last 2 parts of the paper i couldnt get them at all
I did the first of them, I equated the energy before the coalesce, vertically below the centre, (to equate it then to that at A) to the one (before the coalesce; we got given the speed) at A .
Equated the energy before the coalesce to the new one at A
and I got a expression with a In it so I left it cause it asked for a value of K, I don't remember if it left the motion at A if so we were meant to use N2L and find 2 expressions for the velocity which would then be replaced in the energy equation giving us an answer, but I only did till the expression, I know I got full marks for Q. 1, Q.4 all marks except for those mentioned (13 however I might get some for the energy stuff) Q2 I started the integration but I don't understand how we were meant to integrate x/2 which apparently gave k as 2 still though I will pick up some marks
Q 3 I got the first 7, then the one, didn't get the amplitude so I made it up, same as the angular frequency and found a fake speed which I hope gets me 2 marks,

I revised so much for this and we get questions with vertical elastic shm, that of the circle was mad, I didn't manage to get through to all the questions about the COM, I got an A in a mock and I've lost like 37 marks, hopefully less and hopefully
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charliemaths1207
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Did anyone else find this paper to be extremely hard? I've never seen a paper like this normally I have a good idea of what to do but for the last 2 questions I was really stuck. Here's hoping the grade boundaries are REALLY low
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chemari1
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(Original post by charliemaths1207)
Did anyone else find this paper to be extremely hard? I've never seen a paper like this normally I have a good idea of what to do but for the last 2 questions I was really stuck. Here's hoping the grade boundaries are REALLY low
same man
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Aph
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(Original post by charliemaths1207)
Did anyone else find this paper to be extremely hard? I've never seen a paper like this normally I have a good idea of what to do but for the last 2 questions I was really stuck. Here's hoping the grade boundaries are REALLY low
Hated it.
I loved question 1 and 3 was okay-ish... But 2ii & III and 4i and the last part was a nightmare.
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chemari1
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(Original post by Aph)
Hated it.
I loved question 1 and 3 was okay-ish... But 2ii & III and 4i and the last part was a nightmare.
what do you reckon about the boundaries?
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Aph
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(Original post by chemari1)
what do you reckon about the boundaries?
I'm hoping similar to 2014 although I recon that paper was harder than 14's
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chemari1
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(Original post by Aph)
I'm hoping similar to 2014 although I recon that paper was harder than 14's
In question 3 what did you put for the amplitude and angular frequency-period?
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Aph
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(Original post by chemari1)
In question 3 what did you put for the amplitude and angular frequency-period?
Amplitude was 0.2
I can't remember anything else
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chemari1
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(Original post by Aph)
Amplitude was 0.2
I can't remember anything else
I was absolutely baffled by that of the amplitude, how did you find it? I don't even know how I did get to get the right answer for the equation of motion
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¡Muy bien!
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(Original post by chemari1)
I was absolutely baffled by that of the amplitude, how did you find it? I don't even know how I did get to get the right answer for the equation of motion
The equalibrium position was x=4 because the equation of motion was a=-10 (4-x) and a=0 at the centre of oscillation (when x=4).
When x=4.2 the particle is at rest, meaning it's at the extremity of the oscillation.
So A=0.2
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chemari1
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(Original post by ¡Muy bien!)
The equalibrium position was x=4 because the equation of motion was a=-10 (4-x) and a=0 at the centre of oscillation (when x=4).
When x=4.2 the particle is at rest, meaning it's at the extremity of the oscillation.
So A=0.2
did it say when the particle was at rest?
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Aph
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(Original post by chemari1)
did it say when the particle was at rest?
You calculated that using the forces I belive.
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chemari1
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(Original post by Aph)
You calculated that using the forces I belive.
ok ta, I put the angular frequency as sqrt of 10, and from that found the period wll I get any marks for that?
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Aph
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(Original post by chemari1)
ok ta, I put the angular frequency as sqrt of 10, and from that found the period wll I get any marks for that?
Root 10 doesn't sound right but you should get follow through marks.
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chemari1
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(Original post by Aph)
Root 10 doesn't sound right but you should get follow through marks.
ta lad, how were you meant to calculate the amplitude though?
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Aph
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(Original post by chemari1)
ta lad, how were you meant to calculate the amplitude though?
Look above
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chemari1
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(Original post by Aph)
Look above
ok, I lost like 30 marks (probs less) what grade do you reckon that is?
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Aph
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(Original post by chemari1)
ok, I lost like 30 marks (probs less) what grade do you reckon that is?
D at best.
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