Edgefield 6091 4E PRELIM P2 2024

Class: Candidate Name: Candidate Index Number: EDGEFIELD SECONDARY SCHOOL 2024 PRELIMINARY EXAMINATION Secondary 4 O Syllabus PHYSICS Paper 2 Structured and Free Response Candidates answer on the Question Paper. No Additional Materials are required. 6091/ 02 August 2024 1 hour 45 minutes READ THESE INSTRUCTIONS FIRST Write in dark blue or black ink. You may use a soft 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. 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. FOR EXAMINER’S USE My target grade/mark: _________ Section A / 70 Section B / 10 TOTAL / 80 Parent’s signature This document consists of 20 printed pages

2 EFSS/PRELIM-2024/SEC 4 PHYSICS (6091)/Paper 2/YAC SECTION A Answer all the questions in the spaces provided. 1 A set of traffic lights hangs from the end of a metal cable. A horizontal chain pulls the traffic lights to the right so that they are above the middle of the road. Fig. 1.1 shows the metal cable inclined to the vertical. Fig. 1.1 The weight of the traffic lights is 240 N. (a) Two of the forces on the traffic lights are the tension in the horizontal chain and the weight of the traffic lights. On Fig. 1.1, mark and label the two forces using arrows. [1] (b) The tension in the horizontal chain is 140 N. In the space below, use a scale diagram to determine the size and direction of the resultant of the weight and the tension in the chain. State the scale used for the diagram. scale = ........................................ size of resultant force = ........................................ direction of resultant force = .................................... [3] [Total: 4]

3 EFSS/PRELIM-2024/SEC 4 PHYSICS (6091)/Paper 2/YAC [Turn over 2 Fig. 2.1 shows a steel disc of radius 10.0 cm. Three holes of radii 2.0 cm each are drilled on parts of the steel disc as shown. Fig. 2.1 (a) State the meaning of centre of gravity. ................................................................................................................................... ................................................................................................................................... ............................................................................................................................... [1] (b) State the quadrant in which the centre of gravity of the steel disc is located. ............................................................................................................................... [1] (c) The position of the centre of gravity can be confirmed by balancing the steel disc on a finger. When the steel disc is balanced and does not topple, the centre of gravity is directly above the finger. Explain, using concepts of moment, how this method works. ................................................................................................................................... ................................................................................................................................... ................................................................................................................................... ................................................................................................................................... ............................................................................................................................... [2] 1st quadrant 2nd quadrant 3rd quadrant 4th quadrant

4 EFSS/PRELIM-2024/SEC 4 PHYSICS (6091)/Paper 2/YAC (d) Given that the density of steel is 8.05 g/cm3 and that the steel disc has a thickness of 0.2 cm, calculate the mass of the steel disc with the three holes. mass = .......................................... [2] (e) Sketch, in the space below, any additional drillings to be made, such that the centre of gravity of the steel disc lies definitely at the centre of the disc. [1] [Total: 7]

5 EFSS/PRELIM-2024/SEC 4 PHYSICS (6091)/Paper 2/YAC [Turn over 3 A farmer uses a hydraulic system to operate machinery that is pulled behind a tractor. Two cylinders and the flexible pipe that joins them contain oil. Two pistons keep the oil in the cylinders. The arrangement is shown in Fig. 3.1. Fig. 3.1 The cross-sectional area of the smaller cylinder is 0.048 m2. The cross-sectional area of the larger cylinder is 0.14 m2. The smaller piston exerts a force of 12 000 N on the oil. (a) Calculate (i) the pressure in the oil, pressure = ........................................ [2] (ii) the force exerted by the oil on the larger piston. force = ................................... [1] (b) Suggest why the resultant force on the larger piston is less than the value obtained in (a)(ii). ................................................................................................................................... ............................................................................................................................... [1] (c) The smaller piston moves a distance of 0.065 m into the cylinder. Calculate the work done on the oil by the smaller piston. work done = ..................................... [2] [Total: 6]

6 EFSS/PRELIM-2024/SEC 4 PHYSICS (6091)/Paper 2/YAC 4 One type of renewable energy source is shown in Fig. 4.1. Fig. 4.1 (a) State the name of the renewable energy source shown in Fig. 4.1. ............................................................................................................................... [1] (b) 1000 kg of cold water at a temperature of 20 °C is pumped down to the hot rocks. The water returns partly as steam and partly as hot water. The steam and the hot water are both at a temperature of 100 °C. The specific heat capacity of water is 4200 J / (kg °C). (i) Calculate the energy needed to heat 1000 kg of water from 20 °C to 100 °C. energy = .................................................. [2] (ii) Explain why more energy is transferred when 1 kg of the steam cools to 20 °C than when 1 kg of the hot water cools to 20 °C. You should include a reference to the arrangement of particles in liquids and in gases in your answer. .......................................................................................................................... .......................................................................................................................... .......................................................................................................................... .......................................................................................................................... ...................................................................................................................... [2] [Total: 5]

7 EFSS/PRELIM-2024/SEC 4 PHYSICS (6091)/Paper 2/YAC [Turn over 5 Fig. 5.1 shows a converging lens, an object O and the image I produced by the lens. Fig. 5.1 is dr