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# Edexcel AS/A2 Mathematics M1 - 8th June 2016 - Official Thread watch

1. (Original post by bcmh)
Anyone agree or disagree with these answers?
Vectors
1a) 104 degrees
C) 640i+640j

Pan on cable
2a) 20.6N
B) 15.5N

Particle into a wall
3) 1.4Ns

Speed-time graph
8.75s

Moments
M=42
D=1.2

Slope question
Coefficient = 0.73

Vectors (again)
F2= 2.5i+2.5j
Speed=13

Connected Particles
T=11.76
Resultant force = 16.6 bearing 45 degrees

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1.a) I got 284... anyone else?
c) same

2. same

3. same
Slope question - sameI didn't get the other vectors question and I don't remember what i got for the last one but it might have been the same as you.
2. Anyone mind giving their opinion on a quick question...

For 7b.) With the vector of velocity (3i - 22j) and acceleration of (3i + 9j) i think it was.

I done it right and got 13, but then i stupidly crossed it out and found the magnitude of the velocity (√493) and magnitude of the acceleration (3√10). And so after 3 seconds of acceleration, i got √493 + 9√10 = 50.7 ms-1.

Do you think i will get 0 marks? I'm thinking yes...
Also, does anyone know how many marks 7b was worth?

Any replies are appreciated
3. (Original post by marshmellow:))
I can confirm that the coefficient of friction was 0.7271966072
can you leave g answers to 3sf?

that paper was easier than past papers
4. (Original post by gunners98)
No worries. Yeah I agree - although I didn't find it too bad I think a few of the questions were tougher than other years. I reckon
73 - 100ums
66 - 90ums
60 - 80ums
I disagree. A lot of the questions have been seen before but with different numbers. The moments question was probably the only unique one there.

I agree with your UMS predictions though.
5. (Original post by Reda2)
Yes you will.
cheers
6. (Original post by stephencurtis)
cheers
How many marks will I lose if I forgot to mutiple by the mass for the impulse question. I got v--u = 7.5 and wrote the formula flr impukse, just stupidly forgot to multiply by 0.4?

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7. What's 9+10
8. (Original post by DW4)
1.a) I got 284... anyone else?
c) same

2. same

3. same
Slope question - sameI didn't get the other vectors question and I don't remember what i got for the last one but it might have been the same as you.
Sorry to burst your bubble on the first one.
The vector was 20i - 5j, if you draw it you'll see the bearing would be 90° + arctan(5/20) = 104°.
9. so is the general gist for T 8.7 ish seconds?

also, how many marks will I lose for drawing the graph without one point of intersection?
10. This paper was harder than last year's and last year paper was 59 for an A so i'm thinking it will be 58 for an A this year
11. (Original post by JLegion)
I disagree. A lot of the questions have been seen before but with different numbers. The moments question was probably the only unique one there.

I agree with your UMS predictions though.
I haven't even nearly done all the papers so I'll take your word for it, but I thought the impulse question was harder than just a standard collision question, the second vectors seemed harder than usual, and like you say the moments question too. But I agree there was nothing ridiculous in this paper.
12. Did we need a bearing for 8b? I only put down the resultant force.
13. (Original post by TercioOfParma)
Forgot to do the bearing, but got the force.

2/4 sound like correct number of marks?

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Same here :/ I'm hoping that it's 3 because the 45 degree angle has been clearly recognised, but unfortunately I think it's most likely going to be 2.
14. (Original post by LukeB98)
June exams only:
2010: 75
2011: 75
2012: 75
2013: 68
2014: 70
2015: 71

Thanks. It was a bit similar to June 2013, I'd say this year it'll be around 70
15. For 8b, didn't the question ask for the Force,so why does it have the bearings and how many marks will i lose for working out only the Force
16. I got all the working out for questions as I did the paper again in the allocated time, anyone need to see it? I made the corrections for the ones I realised I did wrong after the exam
17. Does anyone have the answer for the final part of question 1?
For 8b, didn't the question ask for the Force,so why does it have the bearings and how many marks will i lose for working out only the Force
The question asked for magnitude and direction.
Since it was 4 marks you'll probably lose 2 marks for not listing the direction.
19. Guys for the moments question, I basically got it all right up to the simultaneous equations, where after that I solved them incorrectly...Lol. Would I still get 5/7 you reckon? So like lose the final two A1 marks?
20. Could someone explain to me why the force exerted by the brick is 15.45N and not just its weight, 14.7N. I understand it's accelerating upwards and so there must be a net upwards force greater than the weight. The difference between the force and the weight is the force required to make it accelerate at 0.5m/s^2, so net upwards =1.5g + 0.5x1.5=15.45. Surely though, this is the force that the pan exerts on the brick and not what the brick exerts on the pan? Or am I correct and have I just messed up when reading the question and it's actually asked me to find the force of the pan on the brick?

Also for 7. Is F2 = 2.5i+2.5j or -3.5i+-3.5j. The two answers are pending on which way you put the ratio to find your answer ie 3(-1+x)=2+x and -1+x=3(2+x). Which one is right? I put the 2.5 one but I now think -3.5 was right. How many marks would I lose if it's wrong?

Lastly, for the diagram, I did something stupid. I drew all of it correctly (so correct height/speed, time they decelerated and time stopped) except I didn't make their lines intersect when they were decelerating. Meaning M was above N for the entirety of the graph except for the stop point. Thus meaning they traveled different distances, which we know is wrong. Do I just lose one mark?

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