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# Edexcel M4 15th June 2016 Official Thread

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1. With it so close to the exam and me unable to find an M4 thread for this year I decided to create one.

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Resources:
Past Papers (and mark schemes!)
Specification
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Well they aren't many resource are there...

Well how's it going everyone?
2. physicsmaths

anyone else?

Good luck, crazy M4 people
3. Thank you very much SeanFM. I am doing my AS's this year and I am not doing FP2 or FP3 this year so extra challenge but it is fun (well that's just because I'm crazy!).

(Original post by SeanFM)
physicsmaths

anyone else?

Good luck, crazy M4 people
4. (Original post by Cryptokyo)
Thank you very much SeanFM. I am doing my AS's this year and I am not doing FP2 or FP3 this year so extra challenge but it is fun (well that's just because I'm crazy!).
Wow, I don't know what M4 needs (maybe it's M5 that needs FP2/FP3 or whatever ) but good effort

Here are some madasmaths resources that might be useful.
5. (Original post by SeanFM)
Wow, I don't know what M4 needs (maybe it's M5 that needs FP2/FP3 or whatever ) but good effort

Here are some madasmaths resources that might be useful.
Thanks very much. You do need to know some FP2 but I have covered that and thanks for the resources.
6. For anyone who might be struggling with relative motion (chapter 1), this girl helped me a lot:
7. I will have a look at that a bit later.
(Original post by gagafacea1)
For anyone who might be struggling with relative motion (chapter 1), this girl helped me a lot:
9. Anyone? What did you get for k? K=1 anyone?
10. (Original post by oShahpo)
Anyone? What did you get for k? K=1 anyone?
yeah i got k=1 thank goodness i noticed the lines were parallel at the very end
11. (Original post by Synn)
yeah i got k=1 thank goodness i noticed the lines were parallel at the very end
Do you remember anything else? Did you get distance = 6 at question 4 or 3?
12. (Original post by oShahpo)
Do you remember anything else? Did you get distance = 6 at question 4 or 3?
i remember for 6 c) i ended up with somethng like

(cos(x) = 0)

(sin(x) = 5/6)

i got some large number for 3b and i cant remember question 4 and 5. I wish they swapped one of them for a resisted motion question.
13. (Original post by Synn)
i remember for 6 c) you ended up with somethng like

(cos(x) = 0)

(sin(x) = 5/6)

i got some large number for 3b and i cant remember question 4 and 5. I wish they swapped one of them for a resisted motion question.
Did you get tan theta = 1/root 5? That's question 2 I think or maybe 1
14. Unofficial Markscheme - Let me know if you spot any errors!
1)1/root5
2)k=1
3)5root17 256 degrees 48.5m
4)shown then 6
5)shown then when t=pi/12 speed=U and distance travelled when they meet is (U/6)pi+3
6)shown then sin(theta)=5/6 and it is stable as the second derivative equals 48lmg here
15. (Original post by oShahpo)
Did you get tan theta = 1/root 5? That's question 2 I think or maybe 1
Its question 1 and nope i am 99% sure i messed that question up. The part where sphere A turned an angle of 90 degrees got me, i think ill be happy if i got half the method marks for that question
16. (Original post by Synn)
Its question 1 and nope i am 99% sure i messed that question up. The part where sphere A turned an angle of 90 degrees got me, i think ill be happy if i got half the method marks for that question
Okay, how about the minimum distance between the girl and the car, did you get 48, or some similar number?
I remember the small angle was 3.something.
17. (Original post by oShahpo)
Okay, how about the minimum distance between the girl and the car, did you get 48, or some similar number?
I remember the small angle was 3.something.
i cant remember the answer to that question i remember the method i did though expressing them as position vectors and differentiating to get a minimum value of t. Somewhere along the lines of this anyway
18. (Original post by Ewanclementson)
Unofficial Markscheme - Let me know if you spot any errors!
1)1/root5
2)k=1
3)5root17 256 degrees 48.5m
4)shown then 6
5)shown then when t=pi/12 speed=U and distance travelled when they meet is (U/6)pi+3
6)shown then sin(theta)=5/6 and it is stable as the second derivative equals 48lmg here
I agree with all of it except number 6). The second derivative I got was 44lmg/3

I would also like to add number 4) b) d=12e^-1
19. (Original post by borgunblue)
I agree with all of it except number 6). The second derivative I got was 44lmg/3

I would also like to add number 4) b) d=12e^-1
I agree. I remember the coefficient of lmg was a fraction.
20. Unofficial Markscheme - Updated
1)1/root5
2)k=1
3)5root17 256 degrees 48.5m
4)shown then 6 d=12e^-1
5)shown then when t=pi/12 speed=U and distance travelled when they meet is (U/6)pi+3
6)shown then sin(theta)=5/6 and it is stable as the second derivative equals 44/3lmg here

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Updated: June 15, 2016
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