AQA MM1B Mechanics 1 - 12th June 2015 - Unofficial Mark Scheme

AQA MM1B Mechanics 1 - 12th June 2015 - Exam Paper PDF
Exam Paper: http://docdro.id/14xou

AQA MM1B Mechanics 1 - 12th June 2015 - Grade Boundaries
Full List: http://filestore.aqa.org.uk/over/stat_pdf/AQA-A-LEVEL-GDE-BDY-JUNE-2015.PDF (Maths = Page 17 of PDF).
Summary:
100% = around 70
90% = around 63
A = 56
B = 49
C = 42
D = 35
E = 29
100% AND 90% = A GUESS! - THEY ARE JUST THE DIFFERENCE BETWEEN 'A' AND 'B' GRADE ADDED TO THE A GRADE (I.E. 90% = 7 more than 'A' grade = 56 + 7 = 63).

AQA MM1B Mechanics 1 - 12th June 2015 - Unofficial Mark Scheme

1) Mass of Skateboard = 3.6 kg [3]

2)
a) Resultant Velocity = 6.32 ms^-1 [2]
b) Bearing = 198° [3]

3)
a) Force T = 123565 N [3]
b) Acceleration of Ship 0.374 ms^-2 [4]

4)
a) Acceleration of Particle = (0.3i + 0.4j) ms^-2 [3]
b) Distance Travelled between A and B = 68 m [5]
c) Average Velocity of Particle from A to B = (5.5i + 4j) ms^-1 [2]

5)
a) Acceleration of Block between A and B = 3.92 ms^-2 [4]
b) Speed of Block at B = 3.07 ms^-1 [3]
c) Acceleration of Block between B and B = -0.784 ms^-2 [5]
d) Speed of Block at C = 2.83 ms^-1 [3]
e) A Written Question. [1]

6)
a) Tim for Ball to Travel = 0.9644 s [5]
b) Horizontal Distance travelled by Ball = 6.68 m [2]
c) Maximum Height of Ball = 0.5 m [1]
d) Maximum Speed of Ball = 8.82 ms^-1 [4]

7)
a) Forces Diagram [2]
b) Reaction Force on Crate = 436.3 N [3]
c) No Movement - Work out Resultant Forces, and show that Friction is Larger than the Resultant force from the 2 Pulling Forces. [5]
d) A Written Question. [1]

8)
a) B is ahead of A by 16 m [3]
b) Time When A is 9m Ahead of B = 18 s [8]

UPDATE: I have now added a copy of the paper, ALL mark allocations and some info on each question.

(edited 8 years ago)

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Reply 1

Daveee996

Can you remember how many marks were questions 3 and 7 out of as these are the ones that I did wrong most likely ? The rest look fine : )

Reply 2

will_iredale

Those all look good from my own answers and other peoples question 7, so annoyed I'll have dropped ~6 marks on that question. You're missing the c) on question 5 though :smile:

Reply 3

will_iredale

Original post by Daveee996

Can you remember how many marks were questions 3 and 7 out of as these are the ones that I did wrong most likely ? The rest look fine : )

Not sure about 3 but 7 was 3 marks for part A and 5 marks for part B i believe

Reply 4

hamza3256

please add the marks, and if u have the paper, upload that as well

Reply 5

Jankie

On question 5, I accidentally worked out the tension the wrong way round. So I had the block pulling the tension and the tension pulling the particle for stupid reason. Anyway, if I worked out a value for the acceleration as 1.96 and then used that throughout, with the same method for the rest of the questions, how many marks would I pick up? If any at all

Reply 6

zordman

Original post by will_iredale

Those all look good from my own answers and other peoples question 7, so annoyed I'll have dropped ~6 marks on that question. You're missing the c) on question 5 though :smile:

What was that question?

Reply 7

Aidencp123

Original post by zordman

AQA MM1B Mechanics 1 - 12th June 2015 - Unofficial Mark Scheme

1) Mass of Skateboard = 3.6kg

2)
a) Resultant Velocity = 6.32ms^-1
b) Bearing = 198°

3)
a) 123565
b) 0.374

4)
a) Acceleration = (0.3i + 0.4j) ms^-2
b) Distance Travelled = 68m
c) Average Velocity (5.5i + 4j) ms^-1

5)
a) 3.92 ms^-2
b) 3.07 ms^-1
c) -0.784 ms^-2
d) 2.83 ms^-1

6)
a) 0.9644
b) 6.68
c) 0.5
d) 8.82

7)
a) Reaction Force = 436.3 N
b) No Movement - Work out Resultant Forces, and show that Friction is Larger than the Resultant force from the 2 Pulling Forces.

8)
a) B is ahead of A by 16 m.
b) Time When A is 9m Ahead of B = 18 s

How much was each Q worth?

Reply 8

zordman

Original post by hamza3256

please add the marks, and if u have the paper, upload that as well

Sorry, I don't know what the mark allocations were - I just saved the answers on my calculator. And I also don't have a copy of the Paper.

Reply 9

Chung224

What is 70/75 in terms of ums?

Reply 10

hamza3256

Original post by zordman

Sorry, I don't know what the mark allocations were - I just saved the answers on my calculator. And I also don't have a copy of the Paper.

ok, thanks anyway

Reply 11

Daveee996

Original post by Chung224

What is 70/75 in terms of ums?

It should be between 95-100 UMS, depending on the grade boundaries obviously.

Reply 12

will_iredale

Original post by zordman

What was that question?

Sorry i meant the actual "c)" next to the answer which has been fixed since i posted haha

Reply 13

-jordan-

Original post by Chung224

What is 70/75 in terms of ums?

100UMS more than likely, certainly was on last year's paper, 67 got you full UMS!

Reply 14

zordman

Original post by Chung224

What is 70/75 in terms of ums?

Here is hte UMS from previous Papers: http://www.aqa.org.uk/exams-administration/about-results/uniform-mark-scale/convert-marks-to-ums

I'd say it was an average paper. 70/75 could be 100% UMS, i depends what the cap is. But at least High 90s.

Reply 15

Alexandrite

Original post by Chung224

What is 70/75 in terms of ums?

Probably 100 unless people are right about UMS skyrocketing, which I disagree with.

Reply 16

will_iredale

Rough Mark Allocations

1) 3

2)
A) 2
B) 3

3)
A) 4
B) 3

4) ?

5)
A) 5
B) 3
C) 5
D) 3

6)
A) 4 or 5
B) 3
C) 1
D) 3

7)
A) 3
B) 5

8)
A) 3
B) 8

(edited 8 years ago)

Reply 17

hamza3256

I need 70 ums to get an A, but I made too many stupid mistakes.

Reply 18

whysocereal

what was the answer to the question about an aspect of motion being neglible through modelling as a particle? was it that there was no moments? if so i got 100% :wink: