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# AQA Mechanics 2 Unofficial Mark Scheme

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1. (Original post by Hjyu1)
On 6b is there suppose to be a constant by e^-t
How come?
2. (Original post by bartbarrow)
2ii was 1.26 (cube root of 2), the question was "At what time does F act towards south?" so i component = 0, 2 = t^3, t = (2)^1/3
Think that was part iii, so I think you're right and he's forgotten that part, but 8.2 is the magnitude of the force at t=3 which was definitely one of the questions
3. (Original post by jtebbbs)
Think that was part iii, so I think you're right and he's forgotten that part, but 8.2 is the magnitude of the force at t=3 which was definitely one of the questions
Ah, yep, he's just forgotten a part
4. (Original post by benjammy)
I included work against friction in my solution and got 7.5m as my answer
7.50 and 4? (reject 4 obvs) I got that but didn't use cos30 to find the frictional force so maybe we made the same mistake?
5. (Original post by jtebbbs)
How come?
I didn't have one and on the mark scheme there is one
6. (Original post by Hjyu1)
I didn't have one and on the mark scheme there is one
Yeah think there is, cause you have ln(g - lambda*v) so when you get rid of the logs you still have a lambda so you have to divide through by it
7. (Original post by jtebbbs)
Yeah think there is, cause you have ln(g - lambda*v) so when you get rid of the logs you still have a lambda so you have to divide through by it
Yeah I'm saying by the power
8. (Original post by bartbarrow)
Ah, yep, he's just forgotten a part
Corrected, knew I was missing something!

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9. (Original post by jtebbbs)
7.50 and 4? (reject 4 obvs) I got that but didn't use cos30 to find the frictional force so maybe we made the same mistake?
We have the exact same solution. I didn't use cos30 either I don't think, I'd expect us to to get around ⅝ marks on that question then - dropping two marks for not using cos30 (though they may be kind and we may only lose one) and then the final answer mark
10. (Original post by Hjyu1)
Yeah I'm saying by the power
Yeah because when you integrate the left hand side, you have to divide through by -lambda cause of the chain rule, so when you multiply your expression by lambda, t becomes lambda*t
11. (Original post by Hjyu1)
Yeah I'm saying by the power
Yes there was. It's a common mistake but you had to multiply both sides by -lambda before integrating as the g-lambda*v differentiates to -lambda.

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12. (Original post by benjammy)
We have the exact same solution. I didn't use cos30 either I don't think, I'd expect us to to get around ⅝ marks on that question then - dropping two marks for not using cos30 (though they may be kind and we may only lose one) and then the final answer mark
I'd say we'd get one for considering all the transfers of energy, maybe two for getting all but one term correct and getting all the distances correct, then hopefully one more method mark somewhere else so maybe 4ish out of 8, don't think it'll be a complete write off
13. Obligatory Mechanics post

14. (Original post by jjsnyder)
Yes there was. It's a common mistake but you had to multiply both sides by -lambda before integrating as the g-lambda*v differentiates to -lambda.

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How many marks would I loose for that
15. (Original post by Hjyu1)
How many marks would I loose for that
Probably 2/3 out of 6.

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16. (Original post by jtebbbs)
Yeah because when you integrate the left hand side, you have to divide through by -lambda cause of the chain rule, so when you multiply your expression by lambda, t becomes lambda*t
I see yeah stupid error when rushing it
17. (Original post by jjsnyder)
Probably 2/3 out of 6.

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Mate you're the one pushing all the grade boundaries up, swear you come out of all these exams with a 100% correct mark scheme in 5 minutes XD
18. I got 7.58
I got x=0 and x=3.58
For last q obv
19. (Original post by C0balt)
I got 7.58
I got x=0 and x=3.58
For last q obv
Most people have that
20. (Original post by jtebbbs)
Mate you're the one pushing all the grade boundaries up, swear you come out of all these exams with a 100% correct mark scheme in 5 minutes XD
Haha had a few incorrect this time, FP2 was 75/75 though Hope they help anyway!

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