WSSS 2007 Prelim P2

Centre Number Index Number Name Class WEST SPRING SECONDARY SCHOOL PRELIMINARY EXAMINATION 2007 PHYSICS PAPER 2 THEORY DATE: 11 / 09/ 2007 DURATION: 1 Hour 45 Minutes READ THESE INSTRUCTIONS FIRST Write your Centre number, index number, name and class on all the work you hand in. Write in dark blue or black pen in the spaces provided on the Question Paper. You may use a soft pencil for any diagrams, graphs or rough working. Do not use staples, paper clips, highlighters, glue or correction fluid. Answer all questions. Write your answers to section A an d to questions 9 and 10 in the spaces provided on the Question paper. Write your answers to Question 11 on the lined pages and, if necessary, continue on the separate answer paper provided. Candidates are reminded that all quantitative answers should include appropriate units. 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. 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. For Examiner’s use A B Total Thirst for Knowledge O O 5052 / 02 SETTER (S): MR. PRAKASH This Document consists of 16 printed pages and 2 lined pages. [Turn Over]

2 Section A Answer all the questions in this section. 1 Fig. 1.1 shows the speed-time graph for a sma ll balloon initially at rest, then falling vertically through the air and then attaining constant speed. (a)(i) Use Fig. 1.1 to determine the time interval over which the balloon is accelerating. …………………………………………………………………………………….….. [1] (ii) Is the acceleration constant ? Explain your answer. ………………………………………………………………………………….………… …………………………………………………………………………………….……[2] (b) Explain, using the forces acting, the motion of the balloon for the first second a f t e r r e l e a s e . ………………………………………………………………………………………….… ………………………………………………………………………………………….… ………………………………………………………………………………………….… ……………………………………………………………………………………….…[2] For Examiner’s Use Fig. 1.1

3 (c) The mass of the balloon is 60 g. The gravitational field strength is 10 N/kg. (i) Calculate the weight of the balloon, weight =……………………. [1] (ii) State the value of the air resistance on the balloon 1.0 s after release. Ex plain your answer. …..…………………………………………..……………………………………… …………………………………………………….…………………..…………[2] For Examiner’s Use

4 2 A cyclist, together with his bicycle, has a tot