2022 SNGS Physics Prelim P2 QP

1 SNGS Sec 4 Physics Prelim P2 2022 Name ___________________________ ( ) Class ______________ PRELIMINARY EXAMINATION GENERAL CERTIFICATE OF EDUCATION ORDINARY LEVEL PHYSICS 6091/02 Paper 2 Theory 24 August 2022 1 hour 45 minutes READ THESE INSTRUCTIONS FIRST Write your name and index number on all the work you hand in. Write in dark blue or black pen. You may use a soft pencil for any diagrams or graphs. Do not use highlighters, correction fluid or correction tape. Section A Answer all questions. Section B Answer all questions. Question 12 has a choice of parts to answer. Students are reminded that all quantitative answers should include appropriate units. The use of 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. This document consists of 22 printed pages. [Turn over] For Examiner’s Use Section A (50 Marks) Section B (30 Marks) Total (80 Marks)

2 SNGS Sec 4 Physics Prelim P2 2022 1 Fig. 1.1 shows a water wheel used in a farm. Water entering at the top turns the wheel about the hub. Fig. 1.1 Point C on the wheel moves in a circular path at a constant speed of 2.5 m/s. (a) (i) State the change in speed of point C as it moves to position D, change in speed =………………….. [1] (ii) Determine the magnitude of the change in velocity of point C as it moves to position D, change in velocity =…………………. [1] (b) The farmer installs a laser counter at L to track the rotation of the wheel. The counter records the time interval between two spokes as the wheel rotates, as shown in Fig. 1.2. time / s 1.48 1.51 1.50 1.49 1.52 Fig. 1.2 Determine the frequency of rotation of the wheel. frequency of rotation = ………………………. [2] water in hub C D L spokes

3 SNGS Sec 4 Physics Prelim P2 2022 2 A bob of mass 0.500 kg falls from rest at a given height and strikes a pond. Fig. 2.1 shows the variation of velocity of the bob with time during its motion. The bob reaches the bottom of pond at R. The gravitational field strength of Earth is 10 N/kg and air resistance is assumed to be negligible. Fig. 2.1 (a) Determine the acceleration of the bob for the first 1. 5 s of its descent. acceleration = ………………. [1]