MSHS 2024 6091 Prelim P2 Sect A and B QP and Ans

This document consists of 23 printed pages inclusive of this cover page. Class / Index Number / Centre Number / ‘O’ Level Index Number / Name MARIS STELLA HIGH SCHOOL PRELIMINARY EXAMINATION SECONDARY FOUR PHYSICS 6091/02 Paper 2 Structured and Free Response 22 August 2024 1 hour 45 minutes Candidates answer on the Question Paper. No Additional Materials are required. READ THESE INSTRUCTIONS FIRST Write your class, index number and name on all the work you hand in. Write in dark blue or black pen. You may use an HB pencil for any diagrams or graphs. Do not use staples, paper clips, glue or correction fluid. Section A Answer all questions. Write your answers in the spaces provided on the question paper. Section B Answer one question. Write your answers in the spaces provided. Circle your choice of question on the cover page. Candidates are reminded that all quantitative answers should include appropriate units. The use of an approved scientific calculator is expected, where appropriate. Candidates are advised to show all their working in a clear and orderly manner, as more marks are awarded for sound use of Physics than for correct answers. 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 (sections A and B) is 80. For Examiner’s Use Section A 70 Section B ( 12 / 13 ) 10 Total 80

2 Section A Answer all questions in this section. 1 Fig. 1.1 shows a man cycling forward on a straight road surface P. After cycling for 10 s, he enters a road surface Q. Throughout the entire journey, the man exerts a constant forward driving force of 600 N. Fig. 1.1 Fig. 1.2 shows a graph of the resistive force acting on the bicycle against time. Fig. 1.2 The man and his bicycle have a combined mass of 150 kg. His initial speed is 2.0 m/s . (a) Calculate the acceleration of the man and his bicycle at t = 5 s. acceleration = …………………….………………….[2] (b) Calculate the speed of the bicycle at t = 10 s. speed = ………………………………...……..[2]

3 (c) Describe the velocity and acceleration of the cyclist from 10 s to 20 s. …………………………………………………………………………………………………….. …………………………………………………………………………………………………….. ………………………………………………………………………………………………….[1] 2 Fig. 2.1 shows an archer shooting an arrow at a target during a competition. Fig. 2.1 (a) The arrow has a mass of 0.025 kg and is initially at rest. The arrow leaves the bow 0.013 s after the bow string is released. When it leaves the bow, the velocity of the arrow is 86 m/s. Calculate (i) the average force exerted on the arrow during the 0.013 s. average force = ……………………………………….[2]

4 (ii) The magnitude of the force exerted on the arrow by the bow string is not consistent during the 0.013 s. Suggest why this is so. ……………………………………………………………………………………………… ……………………………………………………………………………………………… ……………………………………………………………………………………………… ……………………………………………………………………….…………………..[2] (b) On Fig. 2.2, sketch a possible speed -time graph for the arrow after the bow string is released. [2] Fig. 2.2

5 3 A mass, hanging on the end of a string, is pulled horizontally sideways to the right so that the string makes an angle of 30o with the vertical as shown in Fig. 3.1. In this position, the tension in the string is 8.0 N. By means of a scale diagram, determine the weight of the mass. Fig. 3.1 weight of mass = …………………………………………[4] 8.0 N 30o mass weight

6 4 Fig. 4.1 shows a door and an automatic door-closer viewed from above. Fig. 4.1 When the door opens and closes, the hinge acts as a pivot. A girl opens the door by exerting a force P at point X. Force P is perpendicular to the surface of the door. (a) Fig. 4.1 shows that point X is at a distance of 0.72 m along the front of the door from the hinge. The force P is 25 N. (i) Calculate the moment of force P about the hinge. moment of force = ……………………………………[1] (ii) The door rotates about the hinge by 90⁰. As it rotates, the force P remains perpendicular to the surface of the door. The circumference of a circle of radius 0.72 m is 4.5 m. Calculate the work done on the door by force P. work done = ……………………………………………[2] bar fixed to wall hinge door closer bar

7 (b) As the door opens, there is a force F on the door in the direction shown in Fig. 4.1. Although force F is larger than force P, the door rotates about the hinge. Explain why. …………………………………………………………………………………………………….. …………………………………………………………………………………………………….. …………………………………………………………………………………………………….. …………………………………………………………………………………………………..[2] 5 (a) Fig. 5.1 shows an electric circuit powered by a 12.0 V battery of negligible internal resistance. Fig. 5.1 When switch S is closed, calculate (i) the total resistance of the circuit, total resistance = ……………………………………..[2]

8 (ii) the current flowing through the ammeter. current = ……………………………………………….[1] (b) Describe the effect on the reading of the ammeter when the switch S is opened. …………………………………………………………………………………………………….. …………………………………………………………………………………………………..[1] 6 Fig. 6.1 shows how the resistance of a thermistor, R, varies with temperature. Fig. 6.1 . . . .

9 The thermistor is connected to the circuit in Fig. 6.2. Fig. 6.2 The battery has an electromotive force (e.m.f.) of 6.0 V. The voltmeter reads 4.0 V. (a) Determine (i) the total resistance between points X and Y, total resistance between points X and Y = …………….….………………..[2] (ii) the temperature of the thermistor using Fig. 6.1. temperature = ……………………………………...….[2] (b) A student suggests that the circuit in Fig. 6.2 could be calibrated to measure temperature. Suggest a disadvantage of using the thermistor for the measurement of temperature. …………………………………………………………………………………………………….. …………………………………………………………………………………………………..[1]

10 7 Fig. 7.1 shows a d.c. generator. Fig. 7.1 (a) Coil ABCD rotates clockwise. Using arrows, draw the directions of the induced currents on the sides AB and CD of the coil on Fig. 7.1. [1] (b) Sketch on Fig. 7.2, the graph of the induced e.m.f. against time when the coil is rotated.