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

Would drawing it in on the diagram and quoting that this was done provide sufficient for the mark?

nah I think they wanted to play us

@KloppOClock do you agree?

My answers

Question 1:
a) $104$
b) $p=(400+15t)i+20tj$
$q=20ti+(800-5t)j$
c) $q=640i+640j$

Question 2:
a) $T=20.6$
b) $R=15.5$

Question 3:
$|I|=3$

Question 4:
a) Diagram with line at 40ms^-1 for T seconds then falls to 0 at the end of the graph.
Line at 30ms^-1 for 25s then dropping down to 0 at same point as 40ms^-1 line.
b) $T=8.75$

Question 5:
$\mu=0.727$

Question 6:
i) $d=1.2$
ii) $M=42$

Question 7:
a) $F_{2}=2.5i+2.5j$
b) Speed is $13$

Question 8:
a) $T=11.8N$
b) Force on pulley of magnitude 16.6N and it makes an angle of 45 degrees with the downwards vertical.

I might have missed it but has anyone posted thr model answer for the question where you had to find the coefficient of friction?

I might have missed it but has anyone posted thr model answer for the question where you had to find the coefficient of friction?

Model answers for all questions are here: http://www.thestudentroom.co.uk/showthread.php?t=4150149

@KloppOClock do you agree?

My answers

Question 1:
a) $104$
b) $p=(400+15t)i+20tj$
$q=20ti+(800-5t)j$
c) $q=640i+640j$

Question 2:
a) $T=20.6$
b) $R=15.5$

Question 3:
$|I|=3$

Question 4:
a) Diagram with line at 40ms^-1 for T seconds then falls to 0 at the end of the graph.
Line at 30ms^-1 for 25s then dropping down to 0 at same point as 40ms^-1 line.
b) $T=8.75$

Question 5:
$\mu=0.727$

Question 6:
i) $d=1.2$
ii) $M=42$

Question 7:
a) $F_{2}=2.5i+2.5j$
b) Speed is $13$

Question 8:
a) $T=11.8N$
b) Force on pulley of magnitude 16.6N and it makes an angle of 45 degrees with the downwards vertical.

@KloppOClock do you agree?

My answers

Question 1:
a) $104$
b) $p=(400+15t)i+20tj$
$q=20ti+(800-5t)j$
c) $q=640i+640j$

Question 2:
a) $T=20.6$
b) $R=15.5$

Question 3:
$|I|=3$

Question 4:
a) Diagram with line at 40ms^-1 for T seconds then falls to 0 at the end of the graph.
Line at 30ms^-1 for 25s then dropping down to 0 at same point as 40ms^-1 line.
b) $T=8.75$

Question 5:
$\mu=0.727$

Question 6:
i) $d=1.2$
ii) $M=42$

Question 7:
a) $F_{2}=2.5i+2.5j$
b) Speed is $13$

Question 8:
a) $T=11.8N$
b) Force on pulley of magnitude 16.6N and it makes an angle of 45 degrees with the downwards vertical.

Hi for this questions, I did a really stupid mistake, I assumed that A to the centre of the mass equals to D, which means that I used a different distance from the point T. I did rest of the questions right, with wrong values, how many marks did I drop? And is it out of 10 marks for that question? This is how I did it30g(4-x) I got 1m for distance and 90 for mass

That's a much better way than what I did, I can't believe I didn't do it that way.

Instead, I took moments about A and B, and resolved vertically for both scenarios in order to cancel out the reaction forces of S and T.

I then solved simultaneously again for d and M.
I got the same answer and did it a ridiculously long way, so it's likely correct.

Agreed on all answers however it is is worth noting that when drawing the graphs for the two trains you ensure that T is smaller than 25 and hence train N begins to decelerate before train M.

for the first question: did we have to put it as a bearing? or could it have just been 14 degrees

does anyone know where I can find how many marks you have needed at miminum to get 100 UMS over the past few papers, i cant find it anywhere!

Well, I said an anticlockwise angle of 45 from the horizontal. I thought that was specific

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