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# Official M4 Edexcel Thread – Wednesday 15th June 2016 Watch

1. (Original post by ChuckNorriss)
guys, chapter 3 example 2b, that's fp3 right? what else do i need from fp3 for m4? I aint doing fp3...
Look in the formula booklet under FP3!

The only other thing I can think of is resolving vectors (2D collisions with lines at angles).
2. (Original post by ombtom)
Look in the formula booklet under FP3!

The only other thing I can think of is resolving vectors (2D collisions with lines at angles).
Just checked the spec, we only gotta know that the from the example shown.
https://qualifications.pearson.com/c...hs_Issue_3.pdf pg 73.

btw would anyone know if there is a solution bank for the old m4 book? and where can i find it?
thanks
3. (Original post by ChuckNorriss)
Just checked the spec, we only gotta know that the from the example shown.
https://qualifications.pearson.com/c...hs_Issue_3.pdf pg 73.

btw would anyone know if there is a solution bank for the old m4 book? and where can i find it?
thanks
There isnt one and the old book is riddled with mistakes so good luck!

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4. Has anyone done Q3 on the M4 Mock Paper? I keep getting the negative of what I'm supposed to get in the show that...

Attachment 541671541673
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5. So pumped for exam. First proper maths exam I have this year!!!
6. (Original post by Cryptokyo)
So pumped for exam. First proper maths exam I have this year!!!
I still don't understand Relative Velocity diagrams
7. (Original post by Euclidean)
Has anyone done Q3 on the M4 Mock Paper? I keep getting the negative of what I'm supposed to get in the show that...

Attachment 541671541673
Your diagram is incorrect as you have assumed that it rebounds backwards but in fact it does not. I believe the equations should look like

Due to this assumption the tan function yields the negative version of the answer. The angle theta is 90 degress round from where you have it and measured from the horizontal.
8. (Original post by Cryptokyo)
Your diagram is incorrect as you have assumed that it rebounds backwards but in fact it does not. I believe the equations should look like

Due to this assumption the tan function yields the negative version of the answer.
Couldn't the converse be argued though, that if you assume it doesn't rebound backwards it could?

How do you know for sure it doesn't rebound backwards?

edit: Also if the angle is greater than 120 degrees which would be the condition for the ball to not rebound backwards, the tangent function would need to be negative as tangent of an angle greater than 120 and less than 180 would be negative which isn't possible with the show that unless e>5/3?
9. (Original post by Euclidean)
Couldn't the converse be argued though, that if you assume it doesn't rebound backwards it could?

How do you know for sure it doesn't rebound backwards?
The issue is you have measured the wrong angle primarily. The assumption that it travels backwards is not the most important bit. You have measured theta from the negative direction of the velocity and not the positive end. I will post a diagram.

10. Note how theta has been measured. The angle is measured as of the velocity carried on past the collision. So it is easier to assume that it does not rebound.
11. I admit to an appalling diagram XD but it gives a representation right? Please just ask if I have not been clear.
12. Is everyone doing it this year in Year 13? Am I the only Year 12?
13. (Original post by Cryptokyo)

Note how theta has been measured. The angle is measured as of the velocity carried on past the collision. So it is easier to assume that it does not rebound.
(Original post by Cryptokyo)
I admit to an appalling diagram XD but it gives a representation right? Please just ask if I have not been clear.
Ah thank you very much! I understand now

(Original post by Cryptokyo)
Is everyone doing it this year in Year 13? Am I the only Year 12?
I'm in Year 13, I think the majority sitting M4 are
14. (Original post by ombtom)

Has anyone got S1 on the same day too?
I got S1 too! But S1 is very boring!
15. Starting da M4 papers.

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16. (Original post by physicsmaths)
Starting da M4 papers.

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I'm on 2004 atm. Relative motion is still sometimes but getting there

Good luck
17. (Original post by Cryptokyo)
Is everyone doing it this year in Year 13? Am I the only Year 12?
I was going to but college fcuked it up.
18. (Original post by Marxist)
I was going to but college fcuked it up.
Minor, do it next year you doin AFM?

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19. (Original post by physicsmaths)
Minor, do it next year you doin AFM?

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Yeah fam that's what I'm thinking But still would have preferred this year.
20. (Original post by Marxist)
I was going to but college fcuked it up.
So you did M3 on 18th of May?

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