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# OCR Mechanics 1 25th Jan watch

1. so not roll on march 11th- thats the results day, right?
God, ive done badly again! So annoyed....ahhh!!
Are you sure 1.7 for coeff of the friction, cos it normally cannot exceed one?? I got 0.5 something ah!
2. (Original post by MCYan)
so not roll on march 11th- thats the results day, right?
God, ive done badly again! So annoyed....ahhh!!
Are you sure 1.7 for coeff of the friction, cos it normally cannot exceed one?? I got 0.5 something ah!
Yep, that's when they come out.
And the coeff one I also thought that about 1.7, but apparently that's the right answer.
3. im so upset !!
did so many past papers and i thought...there's like a PART of each question i find tricky...and in today's case, it was PARTS of questionS!!
arrrg
march 11th here we come, and june M1 4728 here i come
4. damn, i put 0.5 something at first! But im sure the coef cannot exceed 1, therefore ours cannot be wrong?! because exceeds one is not realistic! for god sake!
the thing which annoys me was i've done all the questions,(well most), after comparing with MrM's answers, Im pretty sure i've got a U
5. (Original post by Heroesorghosts)
Mr. M for the coefficient of friction question, I worked it out as 1.73. Thinking this was wrong I put a line through it and did it a different way, getting a different answer. Will I get any marks for my original correct attempt or will I get zero now?!
You won't get marks for your original answer if you replaced it with something else. What you will get will depend upon whether any of the steps you took in your second calculation were valid.
6. (Original post by MCYan)
damn, i put 0.5 something at first! But im sure the coef cannot exceed 1, therefore ours cannot be wrong?! because exceeds one is not realistic! for god sake!
the thing which annoys me was i've done all the questions,(well most), after comparing with MrM's answers, Im pretty sure i've got a U
One of the things I tell my students is that drag racers have a coefficient of friction between road and tyres of 4 (it is a dubious point though as the rubber deforms and melts into the road to achieve this). I might equally as well say the coefficient of friction between two pieces of welded metal is infinite!
7. (Original post by Mr M)
One of the things I tell my students is that drag racers have a coefficient of friction between road and tyres of 4 (it is a dubious point though as the rubber deforms and melts into the road to achieve this). I might equally as well say the coefficient of friction between two pieces of welded metal is infinite!
Oh dear, I think i had lack of physics practical experiments....yet they did state on the textbook, or somewhere else definite said it
8. (Original post by MCYan)
yet they did state on the textbook
I doubt it. I think your memory is letting you down.

Imagine putting an object on a surface and then tilting it until it forms an angle of 60 degrees with the floor. That object and surface would both have to be mighty rough to prevent the object from sliding don't you think?
9. (Original post by Mr M)
I doubt it. I think your memory is letting you down.

Imagine putting an object on a surface and then tilting it until it forms an angle of 60 degrees with the floor. That object and surface would both have to be mighty rough to prevent the object from sliding don't you think?
Oh yeah, but definitely somewhere said coef of cannot exceed 1, which I imagine for the level we currently studying... And most of questions we've done were all under between 1 and 0, ah damn! I nearly put 1.7 something down :///ahhhhhhh!
10. (Original post by purplestarfish)
I know you dont like speculating about grade boundaries, but im seriously worried and upset, would 38/72, roughly, be a U? ='(
Definitely not.

The worst that could be is a D and it might be a borderline C.
11. Might retake!
Mr M do you give online tuition, cos I seriously think my teacher is rubbish
12. Mr M, for 6) iii) I used t=15 (because its the one I used to prove K=2 which I proved) but when you slot it into the X equation I got 16.5... where did I go wrong?
13. (Original post by MCYan)
Might retake!
Mr M do you give online tuition, cos I seriously think my teacher is rubbish
Too busy i'm afraid. The Further Maths Support Group provide online sessions for free to schools that register with them. Their sessions include OCR Mechanics 1 but very few students bother to revise this way. A handful of my lot joined the OCR Statistics 2 session and they made up about 10% of the people attending nationally!
14. (Original post by Haruhi)
Mr M, for 6) iii) I used t=15 (because its the one I used to prove K=2 which I proved) but when you slot it into the X equation I got 16.5... where did I go wrong?
The question said "C swims from one end of the pool to the other in 28.4 seconds".
15. (Original post by Mr M)
Too busy i'm afraid. The Further Maths Support Group provide online sessions for free to schools that register with them. Their sessions include OCR Mechanics 1 but very few students bother to revise this way. A handful of my lot joined the OCR Statistics 2 session and they made up about 10% of the people attending nationally!
16. (Original post by Mr M)
The question said "C swims from one end of the pool to the other in 28.4 seconds".
O_O NO WAYYYYYYYYYY *Slaps self over 9000 slaps for not reading the question again*

How many marks do you think I'll get for that question? I integrated right but substituted t wrong...
17. (Original post by MCYan)
Your school has to join. It is not for individuals but it is free.

http://www.furthermaths.org.uk/register.php
18. (Original post by Haruhi)
O_O NO WAYYYYYYYYYY *Slaps self over 9000 slaps for not reading the question again*

How many marks do you think I'll get for that question? I integrated right but substituted t wrong...
I expect you will get 3 out of 5.
19. Mr. M would it be possible for you to post solutions to all the questions with the working because I would really like to know the steps for each question?
20. (Original post by Mr M)
I expect you will get 3 out of 5.

And also, for the last question I found v when a=0.11 and used that value of v as u when the log was sliding down, I used -3.15 as acceleration. Somehow I ended up with t= 0.48

Do I get any marks for that?

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