MI 23M1PrelimQP (H2 PHYSICS P3)

Class Adm No Candidate Name: This document consists of 24 printed pages. [Turn over 2023 Preliminary Examination Pre-University 3 H2 PHYSICS 9749/03 Paper 3 Longer Structured Questions 19 September Candidates answer on the Question Paper. 2 hours No Additional Materials are required. READ THESE INSTRUCTIONS FIRST Do not turn over this page until you are told to do so. Write your full name, class and Adm number in the spaces at the top of this page. Write in dark blue or black pen on both sides of the paper. You may use an HB pencil for any diagrams, graphs or rough working. Do not use staples, paper clips, glue or correction fluid. The use of an approved scientific calculator is expected, where appropriate. Section A Answer all questions. Section B Answer one question only. You are advised to spend one and half hours on Section A and half an hour on Section B. The number of marks is given in brackets [ ] at the end of each question or part question. For Examiner’s Use Sect A 1 / 10 2 / 12 3 / 12 4 / 12 5 / 14 Sect B 6 / 20 7 / 20 Presentation Total /80

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4 Section A Answer all the questions in the spaces provided. 1 An object A of mass 9.0 kg and object B of mass 1.0 kg travel towards each other along a smooth horizontal surface in a straight line and collide head-on. The initial speeds of object A and B before the collision are u and 3u respectively. In Fig. 1.1, the variation with time t of momentum p is shown from t = 0 to 3.0 s for particle A and from t = 0 to 1.0 s for particle B. Fig. 1.1 9.0u p 0 1.0 t / s 2.0 –3.0u 3.0

5 [Turn over (a) (i) Momentum is conserved when two objects collide or interact. State the condition under which momentum is conserved. ……………………………………………………………………………………………………... [1] (ii) On Fig. 1.1, draw the variation with t of p from 1.0 s to 3.0 s for object B. [2] (iii) Explain how the principle of conservation of momentum is used to complete the graph in (a)(ii). ……………………………………………………………………………………………………... …………………………………………………………………………………………….……….. …………………………………………………………………………………………….……….. [1] (b) Explain, with appropriate working, whether the collision between objects A and B is elastic. ……………………………………………………………………………………………………............... …………………………………………………………………………………………….………………... [3] (c) (i) Show that the magnitude of the force acting on object A during the collision is 7.2u. [1] (ii) Explain how the graphs in Fig. 1.1 are consistent with Newton’s third law of motion during the collision. ……………………………………………………………………………………………………... …………………………………………………………………………………………….……….. …………………………………………………………………………………………….……….. ……………………………………………………………………………