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GCE JUN 2010 : AS 1 Forces, Energy and Electricity - Revised

16 pages, 44 questions, 5 questions with responses, 5 total responses,

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Sp N ec e ifi w ca tio n Centre Number 71 Candidate Number ADVANCED SUbSIDIARy General Certificate of Education 2010 Physics assessing Module 1: Forces, Energy and Electricity AY111 Assessment Unit AS 1 [Ay111] MONDAy 14 JUNE, MORNING TIME 1 hour 30 minutes. INSTRUCTIONS TO CANDIDATES Write your Centre Number and Candidate Number in the spaces provided at the top of this page. Answer all questions. Write your answers in the spaces provided in this question paper. INFORMATION FOR CANDIDATES The total mark for this paper is 75. Quality of written communication will be assessed in question 6. Figures in brackets printed down the right-hand side of pages indicate the marks awarded to each question. Your attention is drawn to the Data and Formulae Sheet which is inside this question paper. You may use an electronic calculator. For Examiner s use only Question Marks Number 1 2 3 4 5 6 7 8 9 110068 10 Total Marks 6254.06R If you need the values of physical constants to answer any questions in this paper, they may be found on the Data and Formulae Sheet. Examiner Only Marks Remark Answer all ten questions. 1 (a) The second is the S.I. base unit of the physical quantity time. Complete Table 1.1 to show S.I. base units of the other physical quantities listed. Table 1.1 Physical quantity S.I. base unit time second mass length temperature current amount of substance [3] 6254.06R 2 [Turn over (b) The pascal, the coulomb, the watt, and the ohm are all S.I. units, but they are not S.I. base units. Express each of these units in terms of S.I. base units. For example, the newton expressed in S.I. base units is kg m s 2. Examiner Only Marks Remark (i) the pascal the pascal expressed in S.I. base units ____________________ [1] (ii) the coulomb the coulomb expressed in S.I. base units _________________ [1] (iii) the watt the watt expressed in S.I. base units ______________________ [1] (iv) the ohm the ohm expressed in S.I. base units ______________________ [1] 6254.06R 3 [Turn over 2 A goalkeeper kicks a football into the air from the ground at a velocity of 25 m s 1, at an angle of 30 to the horizontal, as shown in Fig. 2.1. Examiner Only Marks Remark 25 ms 1 30 Fig. 2.1 (a) Calculate the maximum height the ball reaches above the pitch. Maximum height = _______________ m [2] (b) Calculate the time that the ball is in the air before it hits the ground. Time = ______________ s [3] (c) Calculate the horizontal distance between the point from which the ball was kicked and where it would land. Distance = _______________ m 6254.06R [2] 4 [Turn over 3 (a) State Newton s first and third laws of motion. Examiner Only Marks Remark Newton s first law _____________________________________________ _____________________________________________________________ _____________________________________________________________ Newton s third law _____________________________________________ _____________________________________________________________ ___________________________________________________________ [2] (b) A student considers a brick resting on the ground as shown in Fig. 3.1. Fig. 3.1 He considered the following four forces which he names forces A, B, C and D. Force A The normal contact force exerted by the ground on the brick Force B The weight of the brick Force C The downwards force exerted by the brick on the ground Force D The gravitational attraction of the brick on the Earth (i) Referring to the forces above, explain how Newton s first law applies to the brick. _________________________________________________________ _________________________________________________________ ______________________________________________________ [2] (ii) Referring to the forces above, explain how Newton s third law applies to the brick and the ground. _________________________________________________________ _________________________________________________________ ______________________________________________________ [2] 6254.06R 5 [Turn over 4 (a) Define the moment of a force about a point. Examiner Only Marks Remark _____________________________________________________________ ___________________________________________________________ [1] (b) State the principle of moments _____________________________________________________________ _____________________________________________________________ ___________________________________________________________ [2] (c) A boy uses a uniform plank of wood of mass 30 kg and length 4.0 m to cross a river. He places one end of the plank on the river bank and rests the plank on a rock in the river as shown in Fig. 4.1. 0.8 m 1.0 m Y X Z rock Fig. 4.1 (i) The rock is 1 m from the end of the plank. The boy, who has a mass of 65 kg, stands 0.8 m from the river bank at end X. Calculate the vertical support force, provided by the rock, at Y. Force at Y = ____________________ N [3] (ii) Will the boy be able to stand at end Z without the plank rising off the riverbank and the boy falling in the river? Explain your answer. _________________________________________________________ ______________________________________________________ [2] 6254.06R 6 [Turn over 5 An apple falls from a tree and hits the ground. Examiner Only Marks Remark (a) Explain how the Principle of Conservation of Energy applies to this apple as it falls. _____________________________________________________________ _____________________________________________________________ ___________________________________________________________ [2] (b) On Fig. 5.1, sketch graphs to show how the potential energy PE the kinetic energy KE and the total energy E of the apple changes with time t from the moment the apple starts falling from the tree until it reaches the ground. PE KE 0 t E t 0 0 t [3] Fig. 5.1 (c) The apple, which has a weight of 1.2 N, takes 0.8 seconds to reach the ground from the moment it starts to fall. Calculate the potential energy of the apple when it was on the tree. Potential energy = __________ J 6254.06R [3] 7 [Turn over 6 A copper wire, of length L and cross-sectional area A, is stretched by a force F causing it to increase in length by an amount e. Examiner Only Marks Remark (a) The Young modulus E of the copper is the ratio of the stress in the wire to the strain of the wire, as shown by Equation 6.1. E= stress strain Equation 6.1 Use Equation 6.1 to obtain an expression for the Young modulus E of the copper wire in terms of L, A, F and e. E = ___________________ [2] (b) Describe an experiment to determine the Young modulus of copper. In your answer: (i) draw a labelled diagram of the arrangement; (ii) give an account of the method, stating what is measured and how, and explaining how the measurements are used to determine the Young modulus. Diagram 6254.06R 8 [Turn over Method Examiner Only Marks Remark _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _______________________________________________________________ [6] Quality of written communication 6254.06R [2] 9 [Turn over 7 A steady electric current of 3 A flows through a copper wire XY which is connected in series to two identical bulbs, a switch and a cell as shown in Fig. 7.1. Examiner Only Marks Remark switch 3A X Z Y Fig. 7.1 (a) (i) Name the charge carriers responsible for the current. Charge carriers = ____________________ [1] (ii) Indicate the direction of flow of these charge carriers between the point X and Y on Fig. 7.1. with an arrow. [1] (b) Express the current of 3 A in terms of rate of flow of charge. ___________________________________________________________ [1] (c) How many charge carriers pass the point Z in the wire in 4 minutes when this current flows? Number of charge carriers = ____________________ [2] (d) When the switch in the circuit shown in Fig 7.1 is closed, both bulbs light simultaneously. Explain why there is no time delay between the lighting of the two bulbs. _____________________________________________________________ _____________________________________________________________ ___________________________________________________________ [2] 6254.06R 10 [Turn over 8 An electrician finds two coils of resistance wire in his bag. The coils of wire are made of materials of different electrical resistivity. Examiner Only Marks Remark (a) Define electrical resistivity. _____________________________________________________________ _____________________________________________________________ ___________________________________________________________ [1] (b) (i) Coil A consists of wire 15 m long, with a diameter of 0.2 mm and a resistance of 9.0 . Calculate the resistivity of the material of Coil A and state its unit. Resistivity = ______________ [3] Unit = ___________________ [1] (ii) Coil B, consists of wire of the same length and diameter as the wire in Coil A but with a resistivity 30 times that of Coil A. Calculate the resistance of Coil B. Resistance of Coil B = ___________________ [1] (c) (i) The electrician has to fix two faults, a heating element and a break in the electrical circuit. He uses wire from the coils to mend the faults. Which coil of wire should the electrician select for each job? To repair the heating element the electrician should choose Coil _______________ To repair the electrical connection the electrician should choose Coil _______________ [1] (ii) Explain your choice of wire to repair the heating element. _________________________________________________________ _______________________________________________________ [1] 6254.06R 11 [Turn over 9 A source of electromotive force has an internal resistance. Examiner Only Marks Remark (a) Describe an effect of this internal resistance. _____________________________________________________________ ___________________________________________________________ [1] (b) An experiment is performed to determine the internal resistance r of a cell using the circuit in Fig. 9.1. E r A R V Fig. 9.1 By varying the load resistance, R, results were obtained for the terminal voltage V and the current drawn from the cell. A graph of the results was plotted and is shown in Fig. 9.2. Terminal voltage V Current Fig. 9.2 (i) Explain how the internal resistance r may be obtained from the graph. ______________________________________________________ [1] (ii) Explain how the e.m.f. E of the cell may be obtained from the graph. ______________________________________________________ [1] 6254.06R 12 [Turn over (c) When no current is drawn from the cell, the potential difference between its terminals is 10.0 V. When a load resistor of 2.0 is connected across the battery the potential difference between the terminals is 9.5 V. Calculate the internal resistance of the cell. Internal resistance = ___________________ 6254.06R 13 Examiner Only Marks Remark [3] [Turn over 10 Four identical 6 resistors are connected together in several different arrangements. Examiner Only Marks Remark (a) Fig 10.1 shows one arrangement of the resistors. I2 X 6 6 6 Y I1 I3 6 Fig. 10.1 (i) Calculate the total resistance between terminals X and Y. Total resistance = ___________________ [1] (ii) State the relationship between I1, I2 and I3. Relationship between I1, I2 and I3 _________________________________ [1] (iii) The value of current I1 is 6 A. Determine the current I3. Current I3 = __________________ A 6254.06R 14 [1] [Turn over (b) Fig. 10.2 shows a different arrangement of the resistors. Examiner Only Marks 6 X Remark 6 Y A 6 6 Fig. 10.2 The potential difference between X and Y is 10 V. What is the current through the ammeter? Current through ammeter = ___________________ A [1] (c) Fig. 10.3 shows a third arrangement of the resistors. X 6 6 Z 6 Y 6 Fig. 10.3 (i) Calculate the resistance between terminals X and Y. Resistance = ___________________ [1] (ii) An additional 6 resistor is connected between terminals X and Y so that it is in parallel with both pairs of 6 resistors. Calculate the total resistance between terminals Y and Z. Resistance = ___________________ 6254.06R 15 [3] [Turn over Permission to reproduce all copyright material has been applied for. In some cases, efforts to contact copyright holders may have been unsuccessful and CCEA will be happy to rectify any omissions of acknowledgement in future if notified. 110068

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Additional Info : Gce Physics June 2010 Assessment Unit AS 1, Module 1: Forces, Energy and Electricity - Revised
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