OCR mechanics M1 22/05 Watch

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Mustard-man
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#1
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How did you find it?

I had trouble with question 6 - the last 2 parts.
Question 7 was a bit strange. You could find the coefficient when it was resting, or you could of done -0.1gsin15 - F = 0.1(-3) when it was moving, I think
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Ying_Yang
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#2
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Definitely the hardest M1 paper of all the past papers. Even the first question was horrible. The cartesian equation one, was impossible. What did you think of the integration one?
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Eclipse
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Did you get a negative mass for the first question? I think I must have done it wrong because I got -400kg and I doubt that is possible.

I didn't have enough time to finish it; I'm ill, and didn't have the right frame of mind, so I'm hoping they will lower the grade boundary, but I doubt that too.
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Mustard-man
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(Original post by Eclipse)
Did you get a negative mass for the first question? I think I must have done it wrong because I got -400kg and I doubt that is possible.

I didn't have enough time to finish it; I'm ill, and didn't have the right frame of mind, so I'm hoping they will lower the grade boundary, but I doubt that too.


Mine wasn't negative - you can't get a negative weight. Mine was some large like 3000kg, I'm pretty sure this is right
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Eclipse
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(Original post by Mustard-man)


Mine wasn't negative - you can't get a negative weight. Mine was some large like 3000kg, I'm pretty sure this is right
Yeah, I knew you couldn't get a negative mass, but I didn't know how else to do it. I used the conservation of momentum. Perhaps my calculation was wrong. Stupid give-away marks that I lost. :mad:
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Kicky
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It was awful! I couldn't do question 5 and ended up with sines and cosines everywhere!
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Mustard-man
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(Original post by Eclipse)
Yeah, I knew you couldn't get a negative mass, but I didn't know how else to do it. I used the conservation of momentum. Perhaps my calculation was wrong. Stupid give-away marks that I lost. :mad:
Ok, pretend unloaded was 1000kg. One is unloaded and one has Xkg.
They both approach at 2m/s and loaded one goes to rest and unloaded goes 6m/s

So it'll be

2(1000) - 2(1000 + x) = -6(1000) + 0 because it's at rest
Then solve to find x, quite simple.
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Mustard-man
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So as a rough guess, how many marks did you guys think you lost?
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Mustard-man
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One other thing, I am so pissed off that none of the invidulators told me that graph paper was provided. The bloody question didn't even say 'use graph paper' or did it?

I'm not happy :mad:
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Eclipse
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You didn't need to use graph paper, as it just said sketch.

But we were provided with graph paper.
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ironically
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Anyone bored/enthusiastic enough to write a short overview of the answers (if they can remember) so we can see how we did?
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Mustard-man
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go on then
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Minthumbug
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ehh, who wants to go through one question at a time??

i think question 1 the mass was 3000kg like someone said earlier.

i can't remember question two though...
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Minthumbug
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i had trouble with Q5, i think it was. where you had to find the coefficient.

did anyone alse get a= -4ms^2?

then 0.98sin15 + friction = 0.1 x -4

or something like that o_O

I got final mu=0.1.. something
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ironically
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(Original post by Minthumbug)
ehh, who wants to go through one question at a time??

i think question 1 the mass was 3000kg like someone said earlier.

i can't remember question two though...
I think I got 2000kg...

Question 2 was the two forces and the resultant (the right angles triangle)...
You know if you got the first bit correct because you have to prove it...
I think the second part was 6 (by pythagoris)
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Minthumbug
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(Original post by ironically)
I think I got 2000kg...

Question 2 was the two forces and the resultant (the right angles triangle)...
You know if you got the first bit correct because you have to prove it...
I think the second part was 6 (by pythagoris)
oh wait yeah i think you're right, 1) was 2000kg

i got the same for 2) aswell so that's good.

what was Q3?
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ironically
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(Original post by Mustard-man)
go on then
Well I'm neither bored nor enthusiastic enough.
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ironically
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#18
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(Original post by Minthumbug)
oh wait yeah i think you're right, 1) was 2000kg

i got the same for 2) aswell so that's good.

what was Q3?
I'm not sure.
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graveyarddreams
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#19
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that went badly. i had problems with the graph question for some reason... and missed out the second part. Also question 6, the one with the train, i couldn't pove the last bit... i've got mass of engine, 64000kg, anyone got that? The rest was ok i think, though i probably made a lot of mistakes.
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Mustard-man
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#20
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Can you guys tell me how bad you did so we can sort of see how bad everyone did!!

Just hope that the grade boundaries will be low
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