2821 Friday 9 JUNE 2006 Morning 1 hour

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OXFORD CAMBRIDGE AND RSA EXAMINATIONS Advanced Subsidiary GCE PHYSICS A Forces and Motion 2821 Friday 9 JUNE 2006 Morning 1 hour Candidates answer on the question paper. Additional materials: Electronic calculator Ruler (cm/mm) Protractor TIME 45 minutes INSTRUCTIONS TO CANDIDATES Write your name, Centre Number and Candidate number in the boxes above. Answer all the questions. Read each question carefully and make sure you know what you have to do before starting your answer. Write your answers, in blue or black ink, in the spaces provided on the question paper. Pencil may be used for graphs and diagrams only. Do not write in the bar code. Do not write in the grey area between the FOR EXAMINER S USE pages. Qu. Max Mark DO NOT WRITE IN THE AREA OUTSIDE THE BOX BORDERING EACH PAGE. ANY WRITING IN THIS AREA WILL NOT BE MARKED. 1 7 2 8 INFORMATION FOR CANDIDATES 3 15 The number of marks is given in brackets [ ] at the end of each question or part question. 4 7 You will be awarded marks for the quality of written communication where this is indicated in the question. 5 11 You may use an electronic calculator. 6 12 You are advised to show all the steps in any calculations. TOTAL 60 This question paper consists of 14 printed pages and 2 blank pages. SP (SLM/CGW) S94228/3 OCR 2006 [M/100/3700] Registered Charity Number: 1066969 [Turn over

Data 2 speed of light in free space, c = 3.00 10 8 ms 1 permeability of free space, 0 = 4 10 7 Hm 1 permittivity of free space, 0 = 8.85 10 12 Fm 1 elementary charge, the Planck constant, unified atomic mass constant, rest mass of electron, rest mass of proton, e = 1.60 10 19 C h = 6.63 10 34 Js u = 1.66 10 27 kg m e = 9.11 10 31 kg m p = 1.67 10 27 kg molar gas constant, R = 8.31 J K 1 mol 1 the Avogadro constant, N A = 6.02 10 23 mol 1 gravitational constant, G = 6.67 10 11 Nm 2 kg 2 acceleration of free fall, g = 9.81 m s 2

Formulae 3 uniformly accelerated motion, s = ut + 1 2 at 2 refractive index, n = v 2 = u 2 + 2as 1 sinc capacitors in series, 1 C = 1 C 1 + 1 C 2 +... capacitors in parallel, C = C 1 + C 2 +... capacitor discharge, x = x 0 e t/cr pressure of an ideal gas, p = 1 Nm 3 V <c 2 > radioactive decay, x = x 0 e λt t = 0.693 λ critical density of matter in the Universe, ρ 0 = 3H 0 2 8 G relativity factor, = (1 v 2 c 2 ) current, I = nave nuclear radius, r = r 0 A 1/3 sound intensity level, = 10 lg ( I I 0 ) [Turn over

4 BLANK PAGE PLEASE DO NOT WRITE ON THIS PAGE

5 Answer all the questions. 1 (a) (i) Below is a list of five quantities. Underline those that are scalar quantities. acceleration energy force power speed [1] (ii) What is a vector quantity?......[2] (b) Fig. 1.1 shows the direction of two forces of 16 N and 12 N acting at an angle of 50 to each other. 16N 50 12N Fig. 1.1 Using Fig. 1.1, draw a vector diagram to determine the magnitude of the resultant of the two forces. magnitude of resultant force... N [4] [Total: 7] [Turn over

6 2 Fig. 2.1 shows a gannet hovering above a water surface. gannet 30m 6.0m fish water Fig. 2.1 The gannet is 30 m above the water. It folds in its wings and falls vertically in order to catch a fish that is 6.0 m below the surface. Ignore air resistance. (a) Calculate (i) the speed that the bird enters the water speed =... m s 1 [2] (ii) the time taken for the bird to fall to the water surface. time =...s [2]

7 (b) The bird does not continue to travel at the acceleration of free fall when it enters the water. State and explain the effect of the forces acting on the bird as it falls (i) through the air............[2] (ii) through the water.............[2] [Total: 8] [Turn over

8 3 Fig. 3.1 shows the path of a ball that has been thrown by a girl towards a vertical wall. wall path of ball 10 m s -1 3.3 m 53 4.9 m Fig. 3.1 The girl throws the ball, of mass 5.0 10 2 kg, with a velocity of 10 m s 1 at 53 to the horizontal. In this question, ignore air resistance. (a) (i) Show that the horizontal component of the velocity is 6.0 m s 1. [1] (ii) In moving to the wall, the ball travels 4.9 m horizontally and 3.3 m vertically. Calculate the time taken for the ball to travel from the girl s hand to the wall. time =...s [2] (iii) Calculate the gain in potential energy of the ball from leaving the girl s hand to when it hits the wall. gain in potential energy =...J [3]

9 (b) The ball is moving horizontally at 6.0 m s 1 when it hits the wall. The ball is in contact with the wall for 0.16 s and rebounds horizontally at 4.0 m s 1. Calculate, for the time that the ball is in contact with the wall (i) the change in velocity of the ball change in velocity =...m s 1 [1] (ii) the horizontal acceleration of the ball (assumed to be constant) acceleration =... unit... [2] (iii) the horizontal force acting on the ball magnitude of the force =...N direction of the force...[3] (iv) the loss in kinetic energy of the ball when rebounding from the wall. loss in kinetic energy =...J [3] [Total: 15] [Turn over

10 4 Fig. 4.1 shows two forces, each of magnitude 1200 N, acting on the edge of a disc of radius 0.20 m. 1200 N 0.20 m 1200 N rotating disc Fig. 4.1 (a) (i) Define the torque of a couple.......[1] (ii) Calculate the torque produced by these forces. torque =...N m [2] (b) This torque is needed to overcome friction and keep the disc rotating at a constant rate. (i) Show that the work done by the two forces when the disc rotates one complete revolution is about 3000 J. [2] (ii) Calculate the power required to keep the disc rotating at 40 revolutions per second. power =... W [2] [Total: 7]

11 BLANK PAGE PLEASE DO NOT WRITE ON THIS PAGE [Turn over

12 5 Fig. 5.1 shows part of the force-extension graph for a spring. The spring obeys Hooke s law for forces up to 5.0 N. 3.0 force / N 2.0 1.0 0 0 5 10 15 20 extension / mm Fig. 5.1 (a) Calculate the extension produced by a force of 5.0 N. extension =...mm [2] (b) Fig. 5.2 shows a second identical spring that has been put in parallel with the first spring A force of 5.0 N is applied to this combination of springs. fixed support 5.0 N Fig. 5.2

13 For the arrangement shown in Fig. 5.2, calculate (i) the extension of each spring extension =...mm [2] (ii) the total strain energy stored in the springs. strain energy =...J [2] (c) The Young modulus of the wire used in the springs is 2.0 10 11 Pa. Each spring is made from a straight wire of length 0.40 m and cross-sectional area 2.0 10 7 m 2. Calculate the extension produced when a force of 5.0 N is applied to this straight wire. extension =...m [3] (d) Describe and explain, without further calculations, the difference in the strain energies stored in the straight wire and in the spring when a 5.0 N force is applied to each....[2] [Total: 11] [Turn over

14 6 In this question, two marks are available for the quality of written communication. (a) Explain the terms motive force and braking force when applied to motion of a vehicle. Discuss the forces acting on the tyre and the road at the point of contact with the road. Explain how changes in the magnitude and direction of the forces alter the acceleration of the vehicle....[5]

15 (b) State the factors that control the braking distance of a car. For each factor, explain the effect on the braking distance....[5] Quality of Written Communication [2] [Total: 12] END OF QUESTION PAPER

16 PLEASE DO NOT WRITE ON THIS PAGE OCR has made every effort to trace the copyright holders of items used in this Question paper, but if we have inadvertently overlooked any, we apologise.