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

I completely guessed 7a) F=2.5i and forgot to write j component. Showed no working. How many marks could i get? please someone?

Maybe maximum half marks of the part I think. If no method then no Method marks. Out of curiosity how did you guess 2.5? If it was a whole number I could understand but it seems a bit random? Good guess and maybe if you had a diagram or something you could get a couple of marks perhaps but just the answer isn't worth much

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Reply 1441

igot100ums

Original post by Don Pedro K.

Guys, for the magnitude of the force exerted on pan by brick, I got the right answer but I did it in a way which gave a negative answer for R. how many marks do you think I would lose?

depends, can be all of them if the examiner is peak
most likely to get some method marks

Reply 1442

txnilxnur

2

Original post by Tb3636

For the impulse queation I found the value of u using suvat. But didn't read the queation properly and didn't attempt the impulse. How many marks do you think I will lose? Guessing three. Cheers

Depends if you got u right, it was 3.5ms^1? It was out of 7 so yeah I would probably guess about max 3 marks

Reply 1443

aacargo

1

Original post by TSRPAV

how are people getting 3Ns for impulse? i got 2.48 or something and it seems to work using kinematics,not sure how people are getting 3.5m/s for the velocity off the wall?

I think I did that at first but then corrected myself, you used the force as the acceleration but actually you had to do f=ma first.
Using the force as the acceleration would give you like 2.478.. or something like that

Reply 1444

angrybirdzzz

1

Original post by Questioner1234

Yes it did ask for force on pulley due to string. I think what people mean is that the force is 45 to horizontal which is a bearing of 225.

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Original post by Hasib98

that was the question yes but i dont think the answer is given in bearing form, just an angle respective of the direction

i just wrote diagonal cos i was confused LOOOL

Thanks.

Reply 1445

dodgewc25

7

Worked answer to the moments question anyone where you had to find d?

Don't know why but people at my school are saying d is 3. How did they get to that do you think and are they wrong?

Reply 1446

Hasib98

2

Original post by E1Ephan7

I completely guessed 7a) F=2.5i and forgot to write j component. Showed no working. How many marks could i get? please someone?

wow what a badass guess LOOL so accurate but im not sure, perhaps none :frown:

there was no evidence of working and you forgot to write the j component so sorry bro

Reply 1447

JLegion

2

Original post by dodgewc25

Worked answer to the moments question anyone where you had to find d?

Don't know why but people at my school are saying d is 3. How did they get to that do you think and are they wrong?

Definitely wrong. The plank was non-uniform and of length 6m, so d cannot be 3 otherwise it is uniform.

Generally people are getting 1.2 or 1.6.
1.2 is the favourite.

Reply 1448

Hasib98

2

Original post by dodgewc25

Worked answer to the moments question anyone where you had to find d?

Don't know why but people at my school are saying d is 3. How did they get to that do you think and are they wrong?

Yeah they are wrong LOOOOL
its 1.2 bby

Reply 1449

txnilxnur

2

Original post by Questioner1234

Maybe maximum half marks of the part I think. If no method then no Method marks. Out of curiosity how did you guess 2.5? If it was a whole number I could understand but it seems a bit random? Good guess and maybe if you had a diagram or something you could get a couple of marks perhaps but just the answer isn't worth much

Posted from TSR Mobile

Same thing kind of happened to me... not really sure how I worked it out but I got an answer of 5/2 = p^2 where p was the value of i and j, so then I square rooted 5/2 which gave me root 10 /2.. so no idea what I did but I somehow got the answer 2.5 somewhere so do you think I will get any marks?

Reply 1450

Marxist

10

Original post by matt1234512

what were the units for 42 i think wrote it as in newtons?

You'll be fine.

Reply 1451

Hasib98

2

Original post by txnilxnur

Same thing kind of happened to me... not really sure how I worked it out but I got an answer of 5/2 = p^2 where p was the value of i and j, so then I square rooted 5/2 which gave me root 10 /2.. so no idea what I did but I somehow got the answer 2.5 somewhere so do you think I will get any marks?

sometimes the mark scheme says if so and so number is seen, award this mark so hopefully you pick some up somehwere

Reply 1452

E1Ephan7

1

Original post by Questioner1234

Maybe maximum half marks of the part I think. If no method then no Method marks. Out of curiosity how did you guess 2.5? If it was a whole number I could understand but it seems a bit random? Good guess and maybe if you had a diagram or something you could get a couple of marks perhaps but just the answer isn't worth much

Posted from TSR Mobile

I just fiddled around with numbers on my calculator and got 2.5 for both but thought it wasn't right and only ended up writing it for the i component. I drew a diagram and wrote a couple of scribbly notes but no clear method.

Reply 1453

ODES_PDES

18

Original post by Don Pedro K.

that'd be alright hahaha

Hope so

Reply 1454

txnilxnur

2

Original post by Hasib98

sometimes the mark scheme says if so and so number is seen, award this mark so hopefully you pick some up somehwere

Hopefully! Also.. how many marks do you think i will lose for drawing the graph without a point of intersection?

Reply 1455

TSRPAV

7

Original post by LukeB98

This is how I did it. A bit of resolving for the deceleration after the rebound, then using kinematics equations to find the speed immediately after the collision. Then shove into impulse equation.

R(-> :wink:

F = 0.4a => R/8 = 0.4a, where R = 0.4g.

So, a = g/8 ms^-2

Then we must find the speed immediately after impact:
s=5 , u=?, v=0, a=-g/8 (<- +)
So you get: 0=u^2 - 12.25 => u=7/2 ms^-1

I = m(v-u) => I = 0.4(3.5-(-4) = 3 Ns.

Nah i did it like this:
Mu= 1/8, initial velcoity=4m/s ,mass=0.4kg
-----------------------------------------------------------------------
Off the wall: R(<--): deceleration: a=- muR= 1/8*0.4*g=-0.49 m/s

displacement s: 5m It comes to rest so v=0

so we want to find U as that will be the final velocity off the wall,

v^2=u^2+2as

0^2=u^2+2(-0.49)(5) -------> U= sqrt(2*0.49*5)= 2.21 (2.d.p)

So R(-->) m=0.4kg u=4m/s v=-2.21 m/s

So I=m(v-u) = 0.4(-2.21-4)= 2.484 Ns and its impulse its a magnitude as both the wall and ball have the exact same impulse (i figured out for the other one/negative version)

so i swear thats right??? still dont get how you guys got 3Ns

Reply 1456

Don Pedro K.

9

Original post by student bang

7 marks

That's physically impossible hahaha

Reply 1457

Marxist

10

Original post by txnilxnur

Hopefully! Also.. how many marks do you think i will lose for drawing the graph without a point of intersection?

1 mark which is B1

Reply 1458

Hasib98

2

Original post by txnilxnur

Hopefully! Also.. how many marks do you think i will lose for drawing the graph without a point of intersection?

it was a 4 mark question so i think maybe 2 lost because we needed to use understanding and apply it but dont worry bro i didnt do it either :frown:

Reply 1459

FlakeFace

for impulse 7 marker, i resolved some forces found R found some sort of acceleration did uR for friction but didnt really put it all together and did the wrong thing to work out the impules. How many marks would i lose?

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

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