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Mechanics M1 OCR 16 June 2017 unofficial markcheme

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Reply 40

Ihowa

How did you guys do question 3?

Reply 41

joshgreensmith

Unofficial mark scheme for OCR M1 2017 (NOT MEI), @Fox Corner
Q1 - Distance from A to B = 4.18m, Velocity at B = 8.94ms-1
Q2 - Magnitude of resultant = 17.3N, Bearing = 093.3 degrees
Q3 - Velocity of A = 4.44ms-1, velocity of B = 5.24ms-1, momentum change of A = -0.312kgms-1
Q4 - Verify the distances are the same, velocity of ball = 3.3ms-1 upwards, velocity of object is 14.7ms-1 downwards, time to reach the ground after they coalesce is 1.32s
Q5 - maximum velocity is 2.4ms-1 at 1 second, minimum velocity is 1.45ms-1 at 7/3 seconds, distance while decelerating = 2.57m
Q6 - A = 1.75, angle of slope is 11.8 degrees, normal contact force = 1.92N, verify that the friction is 0.5N, V = 17.2ms-1
Q7 - mu = 0.1875, contact force = 3.19N, acceleration = 5.88ms-2, tension = 1.568N, length = 0.55m (some people are saying 0.64m however)

(edited 6 years ago)

Reply 42

LichForTheWin

Original post by Jodievaughan

I did. I went into the exam expecting it to be my best exam of them all... nope. Didn't even get a final answer for a couple of questions.

Same here, I thought C1 was hard enough last year that they would make this year easy but I guess I was wrong.

Reply 43

KLP44

Original post by Brolicduck

Q1, 8.94
Q2 = root 304 and 087
Intergration Q, t=1 t =7/3

it's 93 not 87, you got 3 degrees as the inclination below the x axis, the question wants the bearing. So 90 plus 3.

Reply 44

Theskengone

Wasn't too bad, not the greatest exam but I'd like to think I got all apart from the total length (last q) and V, attempted both though so should get some marks

Reply 45

KLP44

Original post by Theskengone

Wasn't too bad, not the greatest exam but I'd like to think I got all apart from the total length (last q) and V, attempted both though so should get some marks

Exactly the same as me mate

Reply 46

Ladkus

Someone start an unofficial mark scheme

Reply 47

Onesexysenpai

Original post by LichForTheWin

Who else did worst in their retake :angry:

*worse thank goodness you are clearly not doing english

Reply 48

Theskengone

Original post by Ihowa

How did you guys do question 3?

I treated B as having moved x m, A x-1.6 and did some long ass calculations, however you know that as B moves 1.6m further in two seconds it has a velocity of (1.6/2) m/s greater, so make velocity of A B-0.8 and solve for B then get A :smile:

Reply 49

Brolicduck

how many marks were each of the Qs? and what do you think the grade boundarie will be? i think around 50ish for an A

Reply 50

LichForTheWin

Original post by Onesexysenpai

*worse thank goodness you are clearly not doing english

Sorry for my english but I guess that's why i'm doing those subject isn't it?

Reply 51

KLP44

Original post by joshgreensmith

Can you put the marks given next to these mate?

Reply 52

LichForTheWin

Original post by Ladkus

Someone start an unofficial mark scheme

Jack_Childs27

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9 minutes ago

Report post
(Original post by Brolicduck)
Q1, 8.94
Q2 = root 304 and 087
Intergration Q, t=1 t =7/3see lessit's 93 not 87, you got 3 degrees as the inclination below the x axis, the question wants the bearing. So 90 plus 3.