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# Official OCR A G481 mechanics 20th May 2013 Watch

1. (Original post by Liberty.)
Was you allowed to do the arrow for the force on trolley in pencil?!
Yes I'm sure that will be acceptable! It states on the front of the paper that drawings should be done in pencil anyway doesn't it?
2. For the terminal velocity one is it ok if i said weight = upthrust therefore the resultant force = 0 and the acceleration = 0 so it falls at a constant velocity ? because loads of people put weight = drag
3. (Original post by mathphysics)
i see no mark scheme anywhere?!?! am i just being stupid
No its a false alarm everyone chilllax
4. (Original post by Joe899)
Oh..I can't remember either to be honest, but I also got 3.5 for the acceleration
Yay, I got this, too! Phew! That's at least one correct answer

Thought it wasn't too bad a paper to be honest. My friends came out saying it was awful but I honestly thought it went better than my January attempt. Understood the concepts an awful lot more this time and think it really made a difference. I hope to have done well enough for an A, but there's always that voice of doubt, isn't there... :/
5. where is the unofficial mark scheme ？ :O
6. (Original post by OllieGCSEs)
I remember using this for A and B, then finding the resultant (2.8N i think?), then using F=ma, 2.8 =0.8xa so a=3.5ms^-2, but again, i don't know if it's right
I got the same ))
7. (Original post by NiamhySmyth)
Where have you posted your mark scheme? :/
http://www.thestudentroom.co.uk/show....php?t=2357551
8. I found it so much harder than Jan 13 eugh
9. (Original post by laurence231)
Did anyone else complain about the spring question? The way it said spring a was extended aswell as spring b, instead of compressed for spring A? probably lost a few people marks! did it wrong at first til i used common sense and got 3.5! not too awful of a paper, easy to make silly mistakes, annoyingly i did 100000 cm3 in 1m3 but its 1000000 instead! ah!
is that x10^-6 cos that's what i did i just imagined 3 length in cm multiplied together and that would give you -6 and the spring one isn't the extension/ compression of the springs acting on one object dependant on which one has a larger force ??
is that x10^-6 cos that's what i did i just imagined 3 length in cm multiplied together and that would give you -6 and the spring one isn't the extension/ compression of the springs acting on one object dependant on which one has a larger force ??
i think i see what you are saying yeah, seems about right for both things! im crap at reading questions and it seems replys on here as i had to edit what i wrote before which was completely wrong!
11. fhfh
12. For Young's modulus the stress was in G pa and the strain was a % so you had to times the stress by 10^6 and divide the strain by 100.

think I got something to the 10^11 which is to the same amount of zeros as I've calculated Young's modulus to in other past papers so think its right.
13. from the unofficial mark scheme,i think i got like 46/60/. what grade would that be?
14. (Original post by MrAtjw)
For Young's modulus the stress was in G pa and the strain was a % so you had to times the stress by 10^6 and divide the strain by 100.

think I got something to the 10^11 which is to the same amount of zeros as I've calculated Young's modulus to in other past papers so think its right.
*10^9
15. (Original post by MrAtjw)
For Young's modulus the stress was in G pa and the strain was a % so you had to times the stress by 10^6 and divide the strain by 100.

think I got something to the 10^11 which is to the same amount of zeros as I've calculated Young's modulus to in other past papers so think its right.
giga is x10^9 isnt it? but your x10^11 matches what other people got, i forgot to divide the percentage by 100!! ah!
16. (Original post by laurence231)
i think i see what you are saying yeah, seems about right for both things! im crap at reading questions and it seems replys on here as i had to edit what i wrote before which was completely wrong!
meh me too I resolved the forces wrong and got the magnitude of F wrong on question 2 because I didn't read the question carefully enough fml even the brightest of students are saying this was a tricky paper
17. Everyone who took this exam, please complete the Poll

http://www.thestudentroom.co.uk/show....php?t=2357507

In order to let OCR know it was too hard!!
18. (Original post by laurence231)
Did anyone else complain about the spring question? The way it said spring a was extended aswell as spring b, instead of compressed for spring A? probably lost a few people marks! did it wrong at first til i used common sense and got 3.5! not too awful of a paper, easy to make silly mistakes, annoyingly i did 100000 cm3 in 1m3 but its 1000000 instead! ah!
Agree with you here i just sort of ignored this but yeah this is very misleading.
19. (Original post by laurence231)
giga is x10^9 isnt it? but your x10^11 matches what other people got, i forgot to divide the percentage by 100!! ah!
I made the same mistake I even saw it was a percentage and my brain apparently decided to be a muppet and completely ignore it. Silly brain.

Kicking myself about the cm^3/m^3 conversion as I made that mistake way back during unit one lessons! What a clown. Ehh dear. Ah well, mistakes are there to learn from! .. If you remember you made the mistake in the first place

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