CCEA M1 13th May 2013

Yeah, these are my own answers.

I was really surprised that they took the question paper off us, did that happen to anyone else?

Happens in every exam I sit? I don't find this odd at all

can this paperrr get any worseeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee????????????


arghhhhhhhhhhhhhh !!1

the moment Qn! wth was that???

omgggg

Q2 (i) u = 14.7 m/s
Q2 (ii) s = 11.0 m (3sf)

Q3 (i) 7120 N
Q3 (ii) Maximum number of people = 7
Q3 (iv) Cable is inelastic. Treat lift and people as particles

Q4 (i) t = 3/2, 6 seconds
Q4 (ii) s = (2/3)t^3 - (15/2)t^2 + 18t metres
Q4 (iii) 379/12 metres

Q5 (i) v = -5 m/s
Q5 (ii) m = 4 or 12 kg

Q6 (ii) a = (-8y - 6) (y = coefficient of friction)
Q6 (iii) To get answer, use v = u + at, rearrange to get u = -(a)t = -(-8y - 6)T = (8y + 6)T

Q7 (ii) P = 48.3 N (3sf)
Q7 (iii) Q = 59.2 degrees to the pole (answer could also be 120.8 if you took the angle to the other side)

Let me know what you think! (I might have forgotten about some questions, like Q1 :L)

So many different answers, aaah.
For anyone that's interested:
1. P =5.32N (3sf), Q = 11.2N (3sf)
2(i) u=29.4ms^-1
(ii) 44.1m
3. (i) 7120N
(ii) 7.52 so 7 people
(iii)constant acceleration, model people etc as particles
4. (i) at rest when t = 3/2 and 6
(ii) 2/3 t^3 - 15/2 t^2 +18t
(iii) 379/12 = 31.6m
5. (i) 13 ms^-1
(ii) m= 4 or 12
6(i) diagram
(ii) and (iii) I think they're wrong...
7(i) diagram
(ii) P = 67 ???
(iii) Yeah this was bad as well, I had about 10 mins left and my brain just froze

In C1, we were allowed to keep the question paper, and as far as I know, people who sat exams in our school were always allowed to keep A-Level Maths papers

Same in my school as well, we were allowed to take the paper home
Wasn't a bad paper bar the pole and impulse question which for some reason I got totally confused at (m= -12kg) couldn't find the stupid minus error

The paper was so WEIRD!! Its not that the questions were particularly hard or not doable, they were just weird - like the lift question, the momentum question and the inclined plane question. The exception of course being the last question which was absolutely deadly! I couldn't even attempt the last part of the last question! I originally got 4 people for the lift question but knew that was obviously wrong and done my working again and got 7.52 i think so i said that 7 people could get safely in the lift?? The first few questions on the paper were fine!

yay I got 7.52 too, and then said 7

yay I got 7.52 too, and then said 7

These are my answers:

1. P = 5.32N, Q = 10.5N
2. i) u = 29.4
ii) s = 1.5m
3. i) T=7120N
ii) 11 people
iii) particle - air resistance etc.
4. i) 1.5secs, 6secs
ii) s = 2/3t^3 - 15/2t^2 + 18t
iii) 31.6m
5. i) v = 13m/s
ii) m = 4kg or 12kg
6. i) diagram
ii) a= -8u(co-eff of friction) -6
iii) proof - which i was able to derive correctly, which would lead me to believe 6ii) to be correct also
7. i) diagram
ii) P=48.2N
iii) 88.4N, 81.3 degrees - completely made this answer up in the last 10 minutes, I know it's not correct but I hate leaving blanks, so I did it as a normal resolving force Q with the hope of some method marks at least!

I made the exact same mistake!!! I found my error though, i think I had -3 on one side of an equation, brought it over and kept it as -3 instead of changing it to +3! Luckily I found it and i got 4 and 12kg! Was such a weird question... had never done anything like it before! I was basically just going with my instinct on the question and appeared to have got it right (by chance) ahah

I don't see how people are getting u = 29.4 m/s for question 2.

s = 0
u = ?
a = -9.8
t = 3

s = ut + 1/2 at^2
3u + 1/2(-9.8)(3)^2 = 0
u = 14.7 m/s

Solution 2:
u = ?
v = 0
a = -9.8
t = 1.5 (to reach max height, i.e., half the total time)

v = u + at
u = v - at
u = 0 - (-9.8)(1.5)
u = 14.7 m/s