MEI M1 exam discussion - Friday 1st June

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Reply 220

pip94

In 5 part iv how are you meant to find the magnitude of the reaction force from the floor?

Reply 221

firebolt

Original post by xiyangliu

v should be 35 and t should be 15 ....

how did you work that out then? i did think my answer was a bit high but then i was like well its a car its going to go fast

Reply 222

shewhomustnotbnamd

didnt you find they made the answer 0 a lot in the first 2-3 questions?! (i hope other people found this too :P )

Reply 223

xiyangliu

Original post by firebolt

how did you work that out then? i did think my answer was a bit high but then i was like well its a car its going to go fast

Well AB is 300. So
V^2 = U^2 + 2aS
a is 2 s is 300 u is 5. Find v

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Reply 224

pip94

Original post by shewhomustnotbnamd

didnt you find they made the answer 0 a lot in the first 2-3 questions?! (i hope other people found this too :P )

Yeah I kept thinking that too

Reply 225

xiyangliu

Original post by shewhomustnotbnamd

didnt you find they made the answer 0 a lot in the first 2-3 questions?! (i hope other people found this too :P )

They did indeed

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hehehe cool :smile:

Original post by xiyangliu

Well AB is 300. So
V^2 = U^2 + 2aS
a is 2 s is 300 u is 5. Find v

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thats what i did but for some reason in the exam it didnt work out so i should get method marks

Reply 228

xiyangliu

Original post by firebolt

thats what i did but for some reason in the exam it didnt work out so i should get method marks

and error carried on so you probably lose just 1

Reply 229

cloudhang

Original post by Gilsenan

I got the same answers. You had to consider the tension, acceleration (1.1 or whatever was given) and the mass of individual parts of the train and apply newton's second law.
Oh and the value of R.

for the first bit
was it T - Friction = M x A
i cant remember

then driving force - T - Friction = M x A ?

Reply 230

chris_gloyne

Can someone post the questions in full up please?

Reply 231

cloudhang

Original post by Gilsenan

No problem, was gonna say I'm pty sure there was an 800,000 in there somewhere :P

how many marks would i lose if i didnt include G in my calculation :/

Reply 232

Jam'

Original post by TimetoSucceed

im fukin worried about that projectile question, i mean i did prove it [was more complex than needed to be, quadratic formula with sin etc] but it was proved that the ball goes over the bar. Hopefully the mark scheme will have two ways of showing it, or my examiner will like the fact i used a different method and be happy

or just give me 0/6

As long as your working is clear and comprehensible, you'll get the marks. Key things here were:

Working out the time it took the ball to vertically return to 2.44m above ground

Using this time, check whether it reached the necessary horizontal distance of 50m.

Reply 233

Jam'

Original post by cloudhang

how many marks would i lose if i didnt include G in my calculation :/

1 or 2 max, if this is the only mistake made in the question.

Reply 234

hackashaq

Original post by xiyangliu

truck is 5900N
locomotive is 100300N

i got taht

YES SAME! Because the locomotive has a driving force and also resistance!

Reply 235

P_united098

Original post by xiyangliu

1)
(A) FALSE
(B)True
(C)True
(D)False
2)
(i)
v=3t^2-12t+9
(ii)s=t^3-6t^2+9t-2
3)
(i)
(0,0)
(ii) (A): equilibrium (B): zero Displacement
4)
(i) using s=ut+o.5at^2
500=5x20 + 0.5a400
a = 2
(ii)v = 35
5)
(i) hope you got that right, tension, Reaction, friction and weight
(ii)25
(3)50cos30+R=10g solve for R
(IV) NOT SURE
6)
(i) 3.57 some thing like this therefore over
(ii) air resistance

SECTION A

Nice one!
Could you perhaps post up the questions or show the number or marks for each question.
Cheers

Reply 236

Sora

Thought this was a pretty fair exam in comparison to others I have taken. Someone in the exam forgot his calculator and got offered a standard one O.o

Reply 237

Minotauro

Original post by Sora

Thought this was a pretty fair exam in comparison to others I have taken. Someone in the exam forgot his calculator and got offered a standard one O.o

that was meeeeeeeeeeeeeeee :frown:

Reply 238

nasira372

Original post by chris_gloyne

for distance travelled the original position was (3,2) wasnt it? so wasnt it (15,18) - (3,2) to give (12,16).. could be wrong but thats what i put

yes true point, I did that too in the exam.

Did you leave it as (12, 16) or did you then find the magnitude. I did the latter

Reply 239

xiyangliu

Hm....

(1) 6 marks
(2) (I) 4 (ii) 3
(3) (I) 1 (ii) (A) 1 (B) 1
(4) (I) 2 (ii) 3
(5) (I)2 (ii) 2 (III) 2 (Iv) 2
(6) (I) 6 (ii) 1
SB
(7) (I) 4 (ii) (A) 4 (B) 3 (III) 4 (iv) 3
(8) (I) 3 (ii) 1 (III) 3 (iv) 1 (v) 6 and (vi) 4

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