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OCR (non mei) M1 Friday 17th June 2016

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1. (Original post by daniellon)
Cosine rule in the formula booklet?
i got 97.2, you guys sure your not mistaking it for a different answer?
2. (Original post by Snicherz)
forgot to work on time on question 1 , 2 marks off?

(also what was the question on the contact force asking?)
It was just asking you to isolate P as a single component and then calculate the contact force exerted on it by the plane. So you just had to use R and F (which I think you establish in the part of the q before this) and then use pythagorus.
3. (Original post by Furthermaths100)
You are wrong, put one of the forces due north, and the other with 97.18 and resolve to get the resultant and it won't be 6N.
4. (Original post by Mattyreds999)
Would you mind explaining how you got this answer?
5. (Original post by Mattyreds999)
please can you explain to me how I'm wrong in my solution>>>??
6. (Original post by G_8)
Would you mind explaining how you got this answer?
you have two forces acting on a particle, top to tail them, work out angle in-between them using cosine rule seeing as you know a 3 sides
7. (Original post by duncanjgraham)
please can you explain to me how I'm wrong in my solution>>>??
To be honest man, it was like a 2 mark question for that part, from the amount of working you needed to do, thats a slight hint that you may have over complicated it. who knows, maybe its right, my gut tells me that 97.2 was right though. we'll just have to see
8. (Original post by Mattyreds999)
To be honest man, it was like a 2 mark question for that part, from the amount of working you needed to do, thats a slight hint that you may have over complicated it. who knows, maybe its right, my gut tells me that 97.2 was right though. we'll just have to see
it was more than 2, i think 3. I've done it in a slightly unconventional way that's all.
9. (Original post by Mattyreds999)
if you put one due north and the angle between this 4n force and the other as 97.18 degrees and then use cosine rule. you will find the reultant to be six my friend
10. (Original post by Mattyreds999)
The answer cannot be 97.18 as it does not work if you resolve the forces to get the resultant force. Put one of the 4N forces vertical and the other at 97.18, resolve and you will get a vertical as 4-4sin7.18= about 3.5, and horizontal (which is correct either way) as 4cos7.18 which is about 3.96N. Are you therefore saying 3.5^2 + 3.96^2 equals 36? (6^2)
Do the maths, it doesn't work! The answer is 100% 82.8.
11. (Original post by Furthermaths100)
The answer cannot be 97.18 as it does not work if you resolve the forces to get the resultant force. Put one of the 4N forces vertical and the other at 97.18, resolve and you will get a vertical as 4-4sin7.18= about 3.5, and horizontal (which is correct either way) as 4cos7.18 which is about 3.96N. Are you therefore saying 3.5^2 + 3.96^2 equals 36? (6^2)
Do the maths, it doesn't work! The answer is 100% 82.8.
12. How did people generally find that exam? easy, hard or average?
13. (Original post by gmanijn592)
How did people generally find that exam? easy, hard or average?
Tricky in places, probably slightly harder than normal.
14. Okay good, I want to know what the grade boundaries would be like, i think I dropped like 7-8 marks
15. (Original post by gmanijn592)
Okay good, I want to know what the grade boundaries would be like, i think I dropped like 7-8 marks
I think 57 for an A
16. (Original post by gmanijn592)
How did people generally find that exam? easy, hard or average?
It was harder than the average M1 exam. Haven't seen any marks I've dropped yet though
17. How many marks overall do you guys think I will need to get for an A in maths?
18. Was alright, harder than usual. I'm guessing about 54-55 for an A?
19. (Original post by Flytrap1190)
Was alright, harder than usual. I'm guessing about 54-55 for an A?
I'm gonna guess 56
20. (Original post by klosovic)
I'm gonna guess 56
Hm i found it harder than the 2014 one, and that was 55 for an A

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