PRCSS Prelim P2

[Turn over PASIR RIS CREST SECONDARY SCHOOL Preliminary Examination Secondary Four Express CANDIDATE NAME CLASS / INDEX NUMBER Physics 6091/02Paper 2 20 August 2024 1 hour 45 minutesCandidates answer on the Question Paper No Additional Materials are required. READ THESE INSTRUCTIONS FIRST Write your name, class and index number 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. 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 total number of marks is given in brackets [ ] at the end of each question or part question. For Examiner’s Use 80 Parent’s Signature This document consists of 18 printed pages.

2 SECTION A Answer all questions. 1 An airplane, of mass 250 000 kg, is traveling at an altitude of 12 000 m. The airplane encounters severe air turbulence at t = 40 s and experiences rapid ascents and descents. Fig. 1.1 shows the vertical velocity-time graph for the airplane. Fig. 1.1 (a) Describe the vertical forces acting on the airplane at t = 20 s. ………………………………………………………………………………………………….. ………………………………………………………………………………………………….. . [2] (b) Determine the upward force acting on the airplane at t = 46 s. The gravitational field strength is 10 N/kg. upward force = ……………………… [3] (c) Determine the change in the vertical displacement of the airplane from t = 40 s to 85 s. change in vertical displacement = ……………………… [2] [Total: 7] 2.0 −4.0 vertical velocity m/s 4.0 −2.0 20 40 60 80 time / s 100 0 0

3 [Turn over 2 Fig. 2.1 shows a simple hydraulic press. Fig. 2.1 A force of 100 N pushes piston 1, which has a cross-sectional area of 10 cm2, downwards by 20 cm. Piston 2, which has a cross-sectional area of 50 cm2, moves upwards as a result. (a) Define pressure. ………………………………………………………………………………………………….. [1] (b) Calculate (i) the force exerted on piston 2, force = ……………………… [2] (ii) the distance moved by piston 2. distance = ……………………… [2] (c) Explain why the simple hydraulic press does not work if the liquid is replaced by a gas. ………………………………………………………………………………………………….. ………………………………………………………………………………………………….. [1] [Total: 6] piston 2 piston 1 liquid

4 3 Fig. 3.1 shows an unused glass cup with a metal handle.