AS Physics : Mechanics - January 2010 Past Paper

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THIS IS A NEW SPECIFICATION
ADVANCED SUBSIDIARY GCE
PHYSICS A G481
Mechanics
Wednesday 13 January 2010
* O C E / 1 9 0 7 3 *
Candidates answer on the Question Paper
OCR Supplied Materials:
Morning
Data, Formulae and Relationships Booklet
Duration: 1 hour
Other Materials Required:
· Electronic calculator
· Ruler (cm/mm)
· Protractor
* G 4 8 1 *
INSTRUCTIONS TO CANDIDATES
· Write your name clearly in capital letters, your Centre Number and Candidate Number in the boxes above.
· Use black ink. Pencil may be used for graphs and diagrams only.
· Read each question carefully and make sure that you know what you have to do before starting your answer.
· Answer all the questions.
· Do not write in the bar codes.
· Write your answer to each question in the space provided, however additional paper may be used if
necessary.
INFORMATION FOR CANDIDATES
· The number of marks is given in brackets [ ] at the end of each question or part question.
· The total number of marks for this paper is 60.
Where you see this icon you will be awarded marks for the quality of written communication in your
answer.
This means for example you should:
· ensure that text is legible and that spelling, punctuation and grammar are accurate so that the meaning
is clear;
· organise information clearly and coherently, using specialist vocabulary when appropriate.
· You may use an electronic calculator.
· You are advised to show all the steps in any calculations.
· This document consists of 16 pages. Any blank pages are indicated.
© OCR 2010 [J/500/8054] OCR is an exempt Charity
DC (CW/CGW) 19073/4 Turn over

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Page 2

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Answer all the questions.
1 (a) Draw a line from each unit on the left-hand side to the correct equivalent unit on the right-
hand side.
joule (J) kg m s­2
watt (W) Nm
newton (N) J s­1
[2]
(b) This question is about estimating the pressure exerted by a person wearing shoes standing
on a floor, see Fig. 1.1.
Fig. 1.1
(i) Estimate the weight in newtons of a person.
weight = ......................................................…read more

Page 3

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Estimate the total area of contact in square metres between the shoes of this person and
the floor.
area = .................................................... m2 [1]
(iii) Hence estimate the pressure in pascals exerted by this person standing on the floor.
pressure = ....................................................…read more

Page 4

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Fig. 2.1 shows two masses A and B tied to the ends of a length of string. The string passes over a
pulley. The mass A is held at rest on the floor.
pulley
B
1.50 kg
2.80 m
A
floor 1.20 kg
Fig. 2.1
The mass A is 1.20 kg and the mass B is 1.50 kg.
(a) Calculate the weight of mass B.
weight = ...................................................... N [1]
(b) Mass B is initially at rest at a height of 2.…read more

Page 5

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Calculate the velocity of mass B after falling 1.40 m.
velocity = ................................................ m s­1 [2]
(iv) Mass B hits the floor at a speed of 2.47 m s­1. It rebounds with a speed of 1.50 m s­1.
The time of contact with the floor is 3.0 × 10­2 s. Calculate the magnitude of the average
acceleration of mass B during its impact with the floor.
acceleration = ................................................…read more

Page 6

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A lift has a mass of 500 kg. It is designed to carry a maximum of 8 people of total mass 560 kg. The
lift is supported by a steel cable of cross-sectional area 3.8 × 10­4 m2. When the lift is at ground
floor level the cable is at its maximum length of 140 m, as shown in Fig. 3.1. The mass per unit
length of the cable is 3.0 kg m­1.
P
steel cable
140 m
lift shaft
ground floor
Fig. 3.…read more

Page 7

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The lift with its 8 passengers is stationary at the ground floor level. The initial upward
acceleration of the lift and the cable is 1.8 m s­2. Show that the maximum tension in the
cable at point P is 1.7 × 104 N.
[4]
(ii) Calculate the maximum stress in the cable.
stress = ....................................................…read more

Page 8

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An electron in a particle accelerator experiences a constant force. According to one student,
the acceleration of the electron should remain constant because the ratio of force to mass
does not change. In reality, experiments show that the acceleration of the electron decreases
as its velocity increases. Describe what can be deduced from such experiments about the
nature of accelerated electrons.
...................................................................................................................................................
...................................................................................................................................................
...................................................................................................................................................
.............................................................................................................................................. [2]
(b) Fig. 4.1 shows the velocity vector for a particle moving at an angle of 31° to the horizontal.…read more

Page 9

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Fig. 4.2 shows a ship S being pulled by two tug-boats.
Not to scale
1.50 kN
cable
S
55°
direction of
35° travel of
ship S
2.14 kN
tug-boat
Fig. 4.2
The ship is travelling at a constant velocity. The tensions in the cables and the angles made
by these cables to the direction in which the ship travels are shown in Fig. 4.2.
(i) Draw a vector triangle and determine the resultant force provided by the two cables.
resultant force = ....................................................…read more

Page 10

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State the principle of conservation of energy.
...................................................................................................................................................
.............................................................................................................................................. [1]
(b) Describe one example where elastic potential energy is stored.
.............................................................................................................................................. [1]
(c) Fig. 5.1 shows a simple pendulum with a metal ball attached to the end of a string.
string
m
P
h
v
Fig. 5.1
When the ball is released from P, it describes a circular path. The ball has a maximum speed
v at the bottom of its swing. The vertical distance between P and bottom of the swing is h.…read more

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