2024 MSH SC(PHY) PRELIM P2

O Level Centre Number/ Index Number Class Name MARIS STELLA HIGH SCHOOL PRELIMINARY EXAMINATION SECONDARY FOUR SCIENCE (PHYSICS, CHEMISTRY) 5086/02 Paper 2 Physics 22 August 2024 1 hour 15 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. You may use an HB pencil for any diagrams, graphs, tables or rough working. Write in dark blue or black pen. Do not use staples, paper clips, glue or correction fluid. The use of an approved scientific calculator is expected, where appropriate. You may lose marks if you do not show your working or if you do not use appropriate units. Section A Answer all the questions. Write your answers in the spaces provided on the question paper. Section B Answer one question. Write your answers in the spaces provided on the question paper. The number of marks is given in brackets [ ] at the end of each question or part question. For Examiner’s Use Section A 55 Section B 10 Total 65 This document consists of 19 printed pages inclusive of this cover page.

2 Section A Answer all questions in the spaces provided. 1 Fig. 1.1 shows a child sitting on a sledge on a snow-covered hill of constant slope. Fig. 1.1 (not to scale) At time t = 0 s, the child and the sledge begin to move down the hill in a straight line. When the child sees a wall ahead, he applies the brake. The child and sledge continue to travel in a straight line until they come to a stop. (a) Fig. 1.2 shows the child’s speed throughout his descent. Complete the speed-time graph of the child in Fig. 1.2 using the points provided. [2] Fig. 1.2

3 (b) At t = 26 s, the front of the sledge is 35 m from the wall and the child and sledge begin to decelerate. The mass of the child is 46 kg and the mass of the sledge is 9.0 kg. (i) Calculate the energy in the child’s kinetic store at t = 26 s. energy in kinetic store = J [2] (ii) Determine the size of the child’s deceleration. deceleration = m/s2 [2] (iii) Calculate the resultant force on the child and the sledge as they decelerate. resultant force = N [2] (iv) State the energy transfer that is taking place as the child and sledge decelerate. [2] [Total: 10]

4 2 A student sets up the following apparatus in Fig. 2.1 to measure the density of an unknown liquid A. The liquids do not mix. Fig. 2.1 XY is the horizontal line at the same height as the junction between liquid A and water. The cross-sectional area of the U-tube is 2.5 × 10-4 m2, the density of water is 1000 kg/m3 and the gravitational field strength is 10 N/kg. (a) Calculate (i) the mass of water above line XY. mass of water above XY = kg [2] (ii) the pressure due to the water above line XY. pressure = N/m2 [2]