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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…

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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…

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(ii) 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 = .................................................... Pa [1]

[Total: 5]




© OCR 2010…

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2 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…

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(iii) 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 ×…

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3 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…

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(b) (i) 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…

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4 (a) 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.…

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(c) 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…

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5 (a) 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…

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