SJI 2018 Prelim P2

ST JOSEPH’S INSTITUTION PRELIMINARY EXAMINATION 2018 (YEAR 4) CANDIDATE NAME CLASS INDEX NUMBER PHYSICS Paper 2 6091/02 20 August 2018 1 hour 45 minutes (08:00 – 09:45) READ THESE INSTRUCTIONS FIRST Write your name, class and index number on the cover page of this Question Paper and all the work you hand in. Write in dark blue or black pen on both sides of the paper. 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 on the Question Booklet Section B Answer all questions. Question 13 has a choice of parts to answer 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 formulae and all their working in a clear and orderly manner, as more marks are awarded for sound use of Physics than for correct answers. At the end of the examination, fasten all your work securely together. The number of marks is given in brackets [ ] at the end of each question or part question. Section A Q1 Q2 Q3 Q4 Q5 Q6 Q7 Q8 Q9 Q10 Section B Q11 Q12 Q13E Q13O For Examiner’s Use Section A / 50 Section B / 30 Total / 80 This document consists of 23 printed pages including this cover page [Turn Over

2 Section A Answer all the questions in this section 1 Car A moves from X to Y in a straight road at a constant acceleration of 2.0 m/s2 from rest. At the same starting time as car A, car B starts to move from Y to X at a speed of 2.0 m/s. Car B maintains the same speed throughout the whole journey. (a) Describe how the speed of car A changes with time as it moves from X to Y. …………………………………………………………………………………………... ...………………………………………………………………………………………[1] (b) Sketch the velocity-time graph of car A and car B. Taking direction from X to Y as the positive direction. [2] (c) The distance between X and Y is 1000 m. Both cars meet at time, t. (i) Express the distance travelled by car A when both cars meet, in terms of t. distance = ........................................ [1] (ii) Hence, determine the time, t when both cars meet. time = ........................................ [1] v/m/s t/s

3 2 In a pool game, ball A moves horizontally and simultaneously collides with ball B and ball C as shown in Fig 2.1. Upon collision, ball A exerts a 0.50 N force on ball C at an angle of 30° to the horizontal as shown in Fig 2.2. The resultant force acting on ball A is 0.80 N at an angle of 25° to the horizontal as shown in Fig 2.3.