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# OCR Mechanics 1 25th Jan watch

1. One end to the other means the length of one side. It didn't say he swam back. For the pulley question, I really don't know where I went wrong so I think it's either a mistake in the paper or the answer is 1.7. The coeef of tyres is usually 1.7 according to wikipedia. It also stated that mu is usually known to be less than 1 but it can be over 1.
2. (Original post by rustman)
Well that was OK, although I felt some of the questions were really poorly written. For example two horizontal forces with angle 60° between them - they can't both be horizontal in that case - it should have said in the same horizontal plain or something.

Yeah same, 26.7s is what I got too.

As for the coefficient of friction, I got sqrt(3) = 1.71. I took tension into account, but either we all made mistakes or the question was wrong. In what situations could μ be greater than 1?

Yeah the first bit is right. Did it say the time to go to the other end and back?? If so I didn't read it properly so I put 30m.

I got 9.50s for the last question, took a bit of working out though!
I agree that the wording was awful on that second question. I missed it out and came back to it. Had a blank moment though and couldnt remember how to work out the angle between 12N and the resultant.

I took tension into account just based on the fact that it was worth 4 marks and just equalling friction and R to the weight perp and parallel to slope was too simple. But then I am still confused as to whether there would be tension if the other mass was lighter.
3. waiting for Mr. M answers.
i got 25s in 5ii) why is it 26.7s as many said?
8t=3t+0.5*0.4*t^2
t=25s someone tell me which is right?
4. Okay so basically an awfully written exam that forced everyone to drop marks purely because we didn't know what on earth they were talking about..?
5. (Original post by mcp2)
One end to the other means the length of one side. It didn't say he swam back. For the pulley question, I really don't know where I went wrong so I think it's either a mistake in the paper or the answer is 1.7. The coeef of tyres is usually 1.7 according to wikipedia. It also stated that mu is usually known to be less than 1 but it can be over 1.
I divided the 30m by 2 on the next page as ran out of space. Hopefully the marker doesnt spot it then!
6. (Original post by kogaht)
i got 25s in 5ii) why is it 26.7s as many said?
8t=3t+0.5*0.4*t^2
t=25s someone tell me which is right?
B overtakes A after B has a constant speed of 11ms.

I sort of found the distance travelled by both up to the point that B also had a constant velocity. So A had travelled 160m and B had travelled 140m.

The I got 2 simulataneous equations for the part where they both had constant velocity and somehow got 6.333333 seconds which i added to 20 seconds. It still hurts my mind thinking about it and I can't fully remember what i did haha
7. (Original post by Harry-AA)
Okay so basically an awfully written exam that forced everyone to drop marks purely because we didn't know what on earth they were talking about..?
No.
8. (Original post by owen4567)
I divided the 30m by 2 on the next page as ran out of space. Hopefully the marker doesnt spot it then!
Are you sure it didnt say that he swam back because its odd that im not the only one to divide by 2?
9. Can someone please confirm the coefficient of friction stuff, it was a very messed up question, also i completely agree with the wording of the two horizontal forces, that was just awfully written!
10. That was EVERY hard question from past papers in one messed up paper

Fml.
11. Did anyone do C3 as well? You must be loving OCR right now lol
12. (Original post by owen4567)
Are you sure it didnt say that he swam back because its odd that im not the only one to divide by 2?
I've got the exam in front of me, I quote "C swims from one end of the pool to the other in 28.4s"

(Original post by owen4567)
B overtakes A after B has a constant speed of 11ms.

I sort of found the distance travelled by both up to the point that B also had a constant velocity. So A had travelled 160m and B had travelled 140m.

The I got 2 simulataneous equations for the part where they both had constant velocity and somehow got 6.333333 seconds which i added to 20 seconds. It still hurts my mind thinking about it and I can't fully remember what i did haha

That's exactly what I did.
13. (Original post by Will1692)
Did anyone do C3 as well? You must be loving OCR right now lol
When friends ask me which exam board I am sitting my Maths A level with and I say OCR, it always gets a bad reaction. It seems OCR has a reputation for being much harder than AQA etc. Is this the case?

Also, its been 5 years since I last sat my exams and having sat C1, C2 and M1 this month, I am yet to finish the 90 minutes comfortably. Is this the same for every1 or do you finish with time to spare to check over answers?

As for the media frenzy of A levels getting easier, I don't think this is the case at all!
14. I did FP1 the other day, it was certainly harder than most papers, did it with half an hour to spare though. Much better than FP1.
15. I got 0.57 something for that coe question. Obv I thought I was wrong as the equation is f=mu * R. But I when I put the numbers in, the answer exceeds one, therefore I thought it can't be right. But otherwise, it is not right either as it would be R=mu f.. That question is not completely clear...
16. Will scan in the papers in a bit! PM me if you want them! I think it was not too bad except for question 4, 5 and the last part of 7. But nevertheless, this exam series has been the most difficult from all of the past papers.
17. (Original post by JChoudhry)
Will scan in the papers in a bit! PM me if you want them! I think it was not too bad except for question 4, 5 and the last part of 7. But nevertheless, this exam series has been the most difficult from all of the past papers.
+1
18. Well... i guess im saying hello to M1 in June again.
19. ok question paper is up, pm me for the links
20. (Original post by JChoudhry)
ok question paper is up, pm me for the links
Have you got the solutions?

Or has anyone have the answers?

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