2024 BSS 4E Physics P2 Final

O BARTLEY SECONDARY SCHOOL PRELIMINARY EXAMINATION CANDIDATE NAME CLASS INDEX NUMBER PHYSICS 6091 Secondary 4 23 Aug 2024 Paper 2 1 h 45 mins READ THESE INSTRUCTIONS FIRST Write your class, register number and name on all the work you hand in. Write in dark blue or black pen. You may use a soft pencil for any diagrams, graphs or rough working. Do not use staples, paper clips, glue or correction fluid. Section A Answer all questions. Write your answers in the spaces provided. Section B Answer one question. Write your answers in the spaces provided. 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. At the end of the examination, submit this question paper. For Examiner’s Use Section A Section B Total Parent Signature: This document consists of 21 printed pages and 3 blank pages. Set By: QSR

2 BSS/24/Preliminary Examination/4E Physics SECTION A Answer all questions. 1 An aircraft flies at a constant height. The force from the aircraft’s engines produces a force on the aircraft of 36 kN due north, as shown in Fig. 1.1. The wind produces a force of 12 kN towards the east. Fig. 1.1 (not to scale) Draw a scale drawing to show the resultant force acting on the aircraft. Use your drawing to determine the magnitude and direction of the resultant force. scale: ................................................. size of resultant force = .................................................. direction = ............................................. [3] north

3 BSS/24/Preliminary Examination/4E Physics [Turn over 2 Fig. 2.1 shows the path of a ray of blue light as it passes through a glass prism. Fig. 2.1 (a) Determine the refractive index of the prism. Show your working. refractive index = ............................................. [2] (b) Explain why the ray does not emerge into the air at B. ………………………………………………………………………………………………….......... ………………………………………………………………………………………………….......... ………………………………………………………………………………………………….......... …………………………………………………………………………………………………... [2]

4 BSS/24/Preliminary Examination/4E Physics 3 Fig. 3.1 shows a rider on a Personal Mobility Aid (PMA). Fig. 3.1 The PMA contains a battery and a motor to drive the back wheel. (a) The PMA accelerates from rest to 15.0 m/s for 3.0 s with decreasing acceleration. It continues to move for the next 60 m with the same speed. It then decelerates uniformly to rest in the next 2.0 s. On the grid below, plot the speed–time graph for the motion of the PMA. [3] (b) (i) State the name of the energy store in the battery. …………………………………..………………………………………………………... [1] (ii) Describe, in terms of work done, the stages of energy transfer from the energy store in the battery to the kinetic store of energy of the PMA. …………………………………..………………………………………………………........ …………………………………..………………………………………………………........ …………………………………..………………………………………………………... [2] speed m/s time/s

5 BSS/24/Preliminary Examination/4E Physics [Turn over (c) The total mass of the scooter and the rider is 80 kg. Calculate the total kinetic energy of the rider and scooter when the scooter has a speed of 5.0 m/s. kinetic energy = …………………………… [2] (d) The battery is marked ‘energy capacity 0.35 kilowatt-hour (kW h)’. The scooter stops working because the battery is totally discharged (flat). This means that there is no more energy stored in the battery. The battery is then recharged using a 70 W power supply. Calculate the time taken to fully recharge the battery in seconds. time = …………………………… s [2]

6 BSS/24/Preliminary Examination/4E Physics 4 Fig. 4.1 shows a model of the human arm. The rubber band represents the muscle that moves part of the arm XY up. A mass is suspended from section XY, as shown in Fig. 4.2. The weight of section XY is negligible and the model is at rest. Fig. 4.1 Fig. 4.2 (not to scale) (a) State the principle of moments. ………………………………………………………………………………………………….......... ………………………………………………………………………………………………….......... …………………………………………………………………………………………………... [1] (b) Explain why the force that the rubber band exerts on section XY is larger than the weight of the mass in Fig. 4.2. ………………………………………………………………………………………………….......... ………………………………………………………………………………………………….......... ………………………………………………………………………………………………….......... …………………………………………………………………………………………………... [2] (c) The mass suspended from section XY in Fig. 4.2 has a weight of 5.0 N. Calculate the force that the rubber band exerts on section XY. force = …………………………… N [2] rubber band pivot pivot rubber band

7 BSS/24/Preliminary Examination/4E Physics [Turn over (d) Explain how your answer to (c) is different if the weight of section XY is not negligible. ………………………………………………………………………………………………….......... ………………………………………………………………………………………………….......... …………………………………………………………………………………………………... [1] 5 Fig. 5.1 shows a 40 kg mass is initially at rest on a rough table and a 20 kg mass is attached to it via an inextensible and light string. The string goes over a smooth pulley with negligible friction. Fig. 5.1 When the 20 kg mass is released from rest, the two masses start to move together. The friction between the 40 kg mass and the bench is 20 N. Take g = 10 N/kg (a) Considering both masses as a system, calculate the acceleration of the masses when the masses start to move. acceleration = …………………………… [2] (b) Hence, calculate the tension in the string. tension = …………………………… [2] bench 40 kg mass pulley string 20 kg mass

8 BSS/24/Preliminary Examination/4E Physics 6 Most of the energy emitted by the Sun is in three regions of the electromagnetic spectrum. The name of one of these three regions is the ultraviolet region. (a) State the names of all three regions in order of increasing frequency. ……………………………… , ……………………………… , ……………………………… [2] (b) Some of the ultraviolet radiation emitted by the Sun reaches the surface of the Earth. Give one possible harmful effect of excessive exposure to ultraviolet radiation and the property of ultraviolet radiation that causes this damage. damaging effect ……………………………………………………………………..……………... ………………………………………………………………………………………………….......... property ……………………………………………………………………………………….......... ………...…………………………………………………………………………………..…….. [2] (c) The ultraviolet radiation produced has a frequency of 8.8 × 1014 Hz. Calculate the wavelength of this ultraviolet radiation in vacuum. wavelength = …………………………… [2]

9 BSS/24/Preliminary Examination/4E Physics [Turn over 7 A student rubbed a plastic rod with a cloth. The rod became n