TKSS 2024 Prelim P2

1 Physics 6091/Sec4/Preliminary Examinations/2024 [Turn over TANJONG KATONG SECONDARY SCHOOL Preliminary Examination 2024 Secondary 4 NAME INDEX INDEX CLASS NUMBER PHYSICS 6091/02 Paper 2 19 August 2024 1 hour 45 minutes Candidates answer on the Question Paper. No Addtional Materials are required. READ THESE INSTRUCTIONS FIRST Write your name, index number and class in the spaces at the top of this page and on all separate answer paper used. Write in dark blue or black pen. You may use a HB pencil for any diagrams, graphs, or rough working. Do not use staples, paper clips, glue, or correction fluid. Section A Answer all the questions in the spaces provided. Section B Answer only one out of these two questions.. Answer all questions in the space 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 Predicted Grade Before doing assessment: After doing assessment: Section A Section B Total 80 This document consist of 22 printed pages, and 2 blank pages.

Physics 6091/Sec4/Preliminary Examinations/2024 2 BLANK PAGE

3 Physics 6091/Sec4/Preliminary Examinations/2024 [Turn over Section A Answer all questions. 1 A stone falls from the top of a cliff into the sea, as shown in Fig. 1.1a. The speed time graph for the stone is shown in Fig. 1.1b. Fig. 1.1a Fig. 1.1b (a) Describe how the acceleration of the stone changes between point A and point D. ………………………………………………………………...………………………......... ………………………………………………………………...………………………......... ………………………………………………………………...……………………….....[2] (b) Explain, in terms of the forces acting, why the acceleration changes between point A and point B. ………………………………………………………………...………………………......... ………………………………………………………………...………………………......... ………………………………………………………………...………………………......... ………………………………………………………………...……………………….....[3] (c) Explain how Fig. 1.1b shows that the stone does not reach terminal velocity in the air. ………………………………………………………………...………………………......... ………………………………………………………………...……………………….....[1] [Total: 6]

Physics 6091/Sec4/Preliminary Examinations/2024 4 2 A ramp of weight 165 N and length 260 cm is fixed to a lorry, as shown in Fig. 2.1. Fig. 2.1 The end O of the ramp is 240 cm horizontally away from the end of the lorry. The top T of the ramp is 100 cm above the ground. The weight of the ramp acts through the mid - point of the ramp. The lorry exerts a horizontal force FH and a vertical force FV on the ramp at T, as shown in Fig. 2.1. (a) Calculate the clockwise moment about the end O of the ramp. moment = ………………………[2] (b) A man standing on the ramp begins to climb the ramp. (i) State and explain how the clockwise moments about point O change, if at all, as the man moves up the ramp. ………………………………………………………………...…………………...… ………………………………………………………………...…………………...… ………………………………………………………………...…………………...… ……………………………………………………………………………………..[2] (ii) Suggest the point at which another force must act on the ramp. ……………………………………………………………………………………..[1]

5 Physics 6091/Sec4/Preliminary Examinations/2024 [Turn over (iii) By considering moments about the top T of the ramp, explain why this other force is necessary. ………………………………………………………………...…………………...… ………………………………………………………………...…………………...… ………………………………………………………………...…………………...… ……………………………………………………………………………………..[2] [Total: 7]

Physics 6091/Sec4/Preliminary Examinations/2024 6 3 Students A and B are preparing for a talent show. In the show, a water balloon will be dropped on student B’s head from different heights. Student A lifts the water balloon to a height 5.0 m above student B’s head using a pulley as shown in Fig. 3.1. The mass of the water balloon is 1.6 kg. student A student B Fig. 3.1 (a) Assuming the balloon d oes not change shape , explain how the Principle of Conservation of Energy applies during the impact when the water balloon hits student B’s head. ……………………………………………………………………………………………… ……………………………………………………………………………………………… ……………………………………………………………………………………………… ……………………………………………………………………………………………… ……………………………………………………………………………………………… ………………………………………………………………………….………………..[3] (b) Calculate the minimum work that must be done by student A to lift the water balloon a height of 5.0 m. work done = ………………………[2]

7 Physics 6091/Sec4/Preliminary Examinations/2024 [Turn over (c) Use your answer to (b) to calculate the maximum possible speed of the water balloon when it hits student B’s head. speed = ………………………[2] [Total: 7]

Physics 6091/Sec4/Preliminary Examinations/2024 8 4 A page of printed text as shown by the line AB is placed 18 cm from a converging lens of focal length 35 cm. Fig. 4.1 is a scale diagram of the arrangement with each of the two principal focal points of the lens labelled F. (a) By drawing on Fig. 4.1, locate the image of the page AB produced by the lens and label it I. [3] (b) Explain whether the image produced is real or virtual. ………………………………………………………………...………………………........ ………………………………………………………………………………………...….[1] (c) The object is moved away from the lens until the object distance is greater than the focal length. State two changes that this causes to the image. ………………………………………………………………...………………………........ ………………………………………………………………...………………………........ ………………………………………………………………………………………...….[2] [Total: 6] Fig. 4.1 A B

9 Physics 6091/Sec4/Preliminary Examinations/2024 [Turn over 5 Fig. 5.1 shows a hydraulic press used to punch a hole in a thin sheet of metal. Fig. 5.1 (not to scale) The operator exerts a force F on piston P. The atmosphere also exerts a force on P in the same direction as F. Piston P remains stationary. The atmospheric pressure is 1.0 × 105 Pa and the pressure inside the oil is 4.0 × 105 Pa. The cross-sectional area of piston P is 70 µm2. The weight of piston Q is negligible. (a) Calculate (i) the force that the atmosphere exerts on piston P, force = …………………………………… [1] (ii) the force that the oil exerts on piston P, force = …………………………………… [2] (iii) force F. force = …………………………………… [1]

Physics 6091/Sec4/Preliminary Examinations/2024 10 (b) A worker commented that the force exerted on the metal plate at R is smaller than F. State and explain if you agree with his comment. ……………………………………………………………………………………………… …………………………………………………………………………………