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Arsey's Edexcel M1 Summer 2013 Model Solutions BOTH PAPERS

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Reply 160
Original post by Arsey
Looking at past papers when you have access to mark schemes, model answers and not in the pressure of an actual exam is completely different.

This paper was not in the same league as Jan 09. If you had taken the Jan 09 paper yesterday and had never seen it before, the markers would be marking your tears of pain.


Q1 - easy, standard momentum

Q2 - easy, but could cause confusion

Q3 - standard, not easy but should be okay if you had hammered the past papers

Q4 - very easy kinematics

Q5 - fairly easy speed time graph, the 10 seconds later may have caused problems though

Q6 - hard

Q7 - very easy vectors

Q8 - very easy connected particles. The last bit doesn't get asked too often but it is easy.


If this paper is below 60/75 for 80ums I will be absolutely amazed!!!

I'm just wondering what you thought was so hard about question 6, it seemed like a standard moments question to me?
Reply 161
Original post by excal9
90ums is generally 69 or 70/75


72/75 on core 1 this january was 98ums, I don't know how exactly it scales tbh. If say m1 was 58/75 for an A
Reply 162
If you use +2 for a in Q2 instead of -2 will you lose all 6 marks?
and if you get the COM wrong on the moments Q and use this mass for the following Q's will you lose all the marks?
Reply 163
Original post by leafy9
The tension one I got something like 7.6N and 8.4N. Not sure which one for which.
The one with the two balls, I got about 2.8s and about 17.2 m

You remember what you got?


Posted from TSR Mobile


This is what I remember (may not be correct):
Q1) Balls colliding - 14Ns and 1.33 something
Q2) Ropes to attached to ceiling - T = 7.xx N and 8.xx N
Q3) Some pulley stuff - T = 26.1 N
Q4) Something about friction - coefficient = 0.411
Q5) Some balls being thrown - t = 2.xx s and h = 17.7 m
Q6) Vectors - time = 2h?, distance (or was this the speed?) = 8.xx km
Q7) Towbar - 1.02 ms-2, T = 517 N, R = 1750 N
Q8) Moments - x = 0.6 and m = 23.5kg

I thought the towbar question was hardest, really doubtful about that one.
(edited 10 years ago)
Reply 164
Original post by excal9
I'm just wondering what you thought was so hard about question 6, it seemed like a standard moments question to me?


It was conditional moments, some people didn't know the exact objective to get both of them, I knew it was simultaneous equations but I had to take moments 3 times to finally get something that makes sense
Reply 165
Original post by As04
If you use +2 for a in Q2 instead of -2 will you lose all 6 marks?
and if you get the COM wrong on the moments Q and use this mass for the following Q's will you lose all the marks?


ECF (error carried forward) probably get about 2-4 marks in total lose both A1's
Reply 166
If I made equations for P and Q but solved them wrong and got the wrong answer which was used throughout the whole question but got the questions right by using the correct methods for my answer to ai) how many marks will I drop. Will I get M1 marks but obviously not A1 marks?
Original post by Robbie242
It was conditional moments, some people didn't know the exact objective to get both of them, I knew it was simultaneous equations but I had to take moments 3 times to finally get something that makes sense


Same here mate. But I messed up the final answer.:frown:
Reply 168
Original post by Titus20
Arsey, for the elevator question i wrote what was needed for 3 marks but also wrote another incorrect solution. will they ignore this altogether or give credit for what i did do?


Please reply to this arsey!!!!
Original post by Titus20
Please reply to this arsey!!!!


What was wrong with the answer I gave you?
Reply 170
Original post by Titus20
Please reply to this arsey!!!!


You can't write two answers lol, you'll lose A1
Reply 171
Original post by Elbridge
This is what I remember (may not be correct):
Q1) Balls colliding - 14Ns and 1.33 something
Q2) Ropes to attached to ceiling - T = 7.xx N and 8.xx N
Q3) Some pulley stuff - T = 26.1 N
Q4) Something about friction - coefficient = 0.411
Q5) Some balls being thrown - t = 0.2xx s and h = 17.7 m
Q6) Vectors - time = 2h?, distance = 8.xx km
Q7) Towbar - 1.02 ms-2, T = 517 N, R = 1750 N
Q8) Moments - x = 0.6 and m = 23.5kg

I thought the towbar question was hardest, really doubtful about that one.


Q1) Speed A: 2ms-1
[INDENT]Speed B: 1.33ms-1
Q2) Similar answer
Q3) Don't remember. But 26.1N looks familiar
Q4) coefficient of friction :0.4
Q5) Same-ish
Q6) Couldn't solve 'n'
Q7)
a=-1.02ms-2
T, put about 516.7N
R, didn't have a clue... :frown:
Q8) Yup same!

Edit: I asked some people after the exam, they also didn't like question 7...
Original post by Robbie242
You can't write two answers lol, you'll lose A1


Nope, you actually gain full credit if one's correct. :tongue:

Last January's markscheme:

If a candidate makes more than one attempt at any question:
If all but one attempt is crossed out, mark the attempt which is
NOT crossed out.
If either all attempts are crossed out or none are crossed out, mark
all the attempts and score the highest single attempt.
Reply 173
Original post by usycool1
Nope, you actually gain full credit if one's correct. :tongue:

Last January's markscheme:

If a candidate makes more than one attempt at any question:
If all but one attempt is crossed out, mark the attempt which is
NOT crossed out.
If either all attempts are crossed out or none are crossed out, mark
all the attempts and score the highest single attempt.


Oh my god I feel so annoyed now, for the lift I should've done that -.- cheers for the clarification lol...
Reply 174
Original post by usycool1
Nope, you actually gain full credit if one's correct. :tongue:

Last January's markscheme:

If a candidate makes more than one attempt at any question:
If all but one attempt is crossed out, mark the attempt which is
NOT crossed out.
If either all attempts are crossed out or none are crossed out, mark
all the attempts and score the highest single attempt.


Thank you!!! Sorry, your answer at first was fine, but I just wanted to see if an answer from another source would match it for added comfort. Seeing as you've got that directly from a mark scheme I feel very comfortable, thank you!!!
In the last part of the last question (magnitude of force on pulley) how many marks do you reckon the direction was worth, because I got all if it but I ended up saying 45 above and not below. Do I lose 1 or 2 out of the possible 4? Thanks


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Reply 176
i missed the last question, i didn't see it1 Foolish mistake :frown:
Reply 177
Original post by leafy9
Q1) Speed A: 2ms-1Speed B: 1.33ms-1
Q2) Similar answer
Q3) Don't remember. But 26.1N looks familiar
Q4) coefficient of friction :0.4
Q5) Same-ish
Q6) Couldn't solve 'n'
Q7)
a=-1.02ms-2
T, put about 516.7N
R, didn't have a clue... :frown:
Q8) Yup same!

Edit: I asked some people after the exam, they also didn't like question 7...


I think n might have been about 3.5 (not sure). I think you just needed to equate the i and j components, of both s and t (position vectors of the ships after t hours)
Reply 178
Original post by Robbie242
ECF (error carried forward) probably get about 2-4 marks in total lose both A1's

So 2-4 for the entire moments Q? Including part B?
Original post by usycool1
Nope, you actually gain full credit if one's correct. :tongue:

Last January's markscheme:

If a candidate makes more than one attempt at any question:
If all but one attempt is crossed out, mark the attempt which is
NOT crossed out.
If either all attempts are crossed out or none are crossed out, mark
all the attempts and score the highest single attempt.


That's a little bit weird isn't it... you don't even have to be sure about the correct solution to get full marks, just write down every possible solution that comes to your mind :curious:

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