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OCR (Oxford Cambridge and RSA) is a leading UK awarding body, providing a wide range of
qualifications to meet the needs of pupils of all ages and abilities. OCR qualifications include
AS/A Levels, Diplomas, GCSEs, OCR Nationals, Functional Skills, Key Skills, Entry
Level qualifications, NVQs and vocational qualifications in areas such as IT, business,
languages, teaching/training, administration and secretarial skills.
It is also responsible for developing new specifications to meet national requirements and the
needs of students and teachers.…read more

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CONTENTS
Advanced GCE Physics A (H558)
Advanced Subsidiary GCE Physics (H158)
MARK SCHEMES FOR THE UNITS
Unit/Content Page
G481 Mechanics 1
G482 Electrons, Waves and Photons 8
G484 The Newtonian World 14
Grade Thresholds 19…read more

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G481 Mark Scheme January 2010
G481 Mechanics
Question Expected Answers Marks Additional Guidance
1 (a) Correct lines from: B2 Note: 2 marks for all correct
joule (J) to N m 1 mark for two correct
watt (W) to J s-1 0 marks for none or one correct
newton (N) to kg m s-2
(b) (i) weight in the range 200 to 1200 (N) B1
(ii) area in the range 0.01 to 0.…read more

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G481 Mark Scheme January 2010
Question Expected Answers Marks Additional Guidance
-2
2 (a) W mg Allow: Use of 9.8 (m s )
weight 1.50 9.81 14.72 (N) or 14. 7 (N) or 15 (N) B1 Allow: Bald 15 (N); but not `1.…read more

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G481 Mark Scheme January 2010
Question Expected Answers Marks Additional Guidance
3 (a) mass = 140 3.0 (= 420 kg) B1 420
Allow: 140 (reverse argument)
3.0
(b) (i) total mass = 500 + 560 + 420 (= 1480 kg) C1 Note:
Omitting one of the masses ­ can score maximum of 3
total weight = 1480 9.8(1) / total weight = 14520 (N) C1 Omitting two masses ­ can score maximum of 2
net force = 1480 1.…read more

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G481 Mark Scheme January 2010
Question Expected Answers Marks Additional Guidance
4 (a) The mass (of the electron) increases M1 Not: mass `changes' / `electron becomes heavier'
as its speed approaches c / speed of light / 3 108 A1
m s-1
(b) (i) A line with correct arrow in the y direction has length B1
of 14 to 16 `small squares'
A line with correct arrow in the x direction has length B1 Note: If correct arrows are not shown, then maximum mark is…read more

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G481 Mark Scheme January 2010
Question Expected Answers Marks Additional Guidance
5 (a) Energy cannot be created or destroyed; it can only Allow: `Energy cannot be created / destroyed / lost'
be transferred/transformed into other forms B1
or
The (total) energy of a system remains constant
or
(total) initial energy = (total) final energy (AW)
(b) Any suitable example of something strained (eg: B1
stretched elastic band)
(c) (i) 1 2 B1 Not: Ek = mgh
Ep= mgh and Ek = mv (Allow h for…read more

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G481 Mark Scheme January 2010
Question Expected Answers Marks Additional Guidance
6 (a) The graph shows length and not extension of the B1 Allow: `length cannot be zero'
spring / spring has original length (of 2.0 cm) (AW)
(b) Straight line (graph) / linear graph / force extension / B1 Not `force length'
constant gradient (graph)
(c) 2.0 C1 Note: The mark is for any correct substitution
force constant =
0.04
A1 Allow: 1 mark for 0.…read more

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G481 Mark Scheme January 2010
Question Expected Answers Marks Additional Guidance
7 (a) (i) It has maximum / large / increased stress at this B1 Allow: it has `same force but thinner/smaller area'
point Not: Thin / small area
(ii) The tape has (permanent) extension / deformation B1 Note: Need reference to force or stress removed
when the force / stress is removed (AW) Allow: `..…read more

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