GCE MARKING SCHEME - MathsDIY

GCE MARKING SCHEME

SUMMER 2018

MATHEMATICS ¨C M1 (LEGACY)

0980-01

? WJEC CBAC Ltd.

INTRODUCTION

This marking scheme was used by WJEC for the 2018 examination. It was finalised

after detailed discussion at examiners' conferences by all the examiners involved in

the assessment. The conference was held shortly after the paper was taken so that

reference could be made to the full range of candidates' responses, with photocopied

scripts forming the basis of discussion. The aim of the conference was to ensure

that the marking scheme was interpreted and applied in the same way by all

examiners.

It is hoped that this information will be of assistance to centres but it is recognised at

the same time that, without the benefit of participation in the examiners' conference,

teachers may have different views on certain matters of detail or interpretation.

WJEC regrets that it cannot enter into any discussion or correspondence about this

marking scheme.

? WJEC CBAC Ltd.

GCE MATHEMATICS ¨C M1

SUMMER 2018 MARK SCHEME

Q

Solution

Mark

Notes

1(a)(i) N2L on lift, upwards +ve

M1

dim correct, all forces

T and 1200g opposing

T ¨C 1200g = 1200a

T = 1200(9.8 +0 2)

T = 14160 (N)

A1

A1

any correct form

cao

1(a)(ii) T = 1200g (= 11760) (N)

1(b)

B1

Mg ¨C R = Ma

M1

M(9.8 ¨C 3) = 442

M = 65

A1

A1

? WJEC CBAC Ltd.

1

dim correct, all forces

No extra

any correct form

cao

Q

Solution

Mark

2

Resolve in one direction

M1

X = 16 - 9cos75?- 21sin60?

X = -4.5159

A1

Resolve in perpendicular direction

M1

Y = 8 + 21cos60? ¨C 9sin75?

Y = 9.8067

A1

Resultant2 = 4.51592 + 9.80672

Resultant = 10.8 (N)

m1

A1

? 4.5159 ?

? = tan ? 9.8067 ??

m1

? = 24.7?

A1

-1 ?

Note

-1 if answers not 1 d.p.

? WJEC CBAC Ltd.

2

Notes

obtain comp of resultant

All forces, no extra

obtain comp of resultant

All forces, no extra.

dep on both M¡¯s

cao

cao

Q

Solution

Mark

Notes

3.

RP

RQ

1.2

P

A

0.3

Q

C

0.4

0.7

B

0.6

24g

36g

Moments about P

M1

36g¡Á0.3 + RQ¡Á1.1 = 24g¡Á0.7

RQ = 53.45 (N)

B1

A1

A1

Resolve vertically

M1

RQ + RP = 36g + 24g

RP = 534.55 (N)

A1

A1

Moments about any point

Correct moment

Correct equation

M1

B1

A1

Attempt at second equation

Correct equation

M1

A1

Correct answers

A1A1

dim correct equation

All forces, no extra

any correct moment

correct equation

cao

dim correct equation

All forces, no extra

cao

Notes

? WJEC CBAC Ltd.

3

same conditions as above

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