2022 JSS Phy Prelims P2

O JURONG SECONDARY SCHOOL 2022 GRADUATION EXAMINATION 2 SECONDARY 4 EXPRESS CANDIDATE NAME CLASS INDEX NUMBER PHYSICS 6091/02 Paper 2 Theory 26 August 2022 1 hour 45 min Candidates answer on the Question Paper. No Additional Materials are required. READ THESE INSTRUCTIONS FIRST Do not open this booklet until you are told to do so. Section A Answer all questions. Write your answers in the spaces provided on the Question Paper. Section B Answer all questions. Question 11 has a choice of parts to answer. Write your answers in the spaces provided on the Question Paper. At the end of the examination, fasten all your work securely together. The number of marks is given in the brackets [ ] at the end of each question or part question. For Examiner’s Use Paper 1 (30%) MCQ [40 marks] Paper 2 (50%) SECTION A [50 marks] SECTION B [30 marks] SUB-TOTAL [80 marks] Paper 3 (20%) PRACTICAL [40 marks] OVERALL % [100 %] This document consists of 25 printed pages including this page.

2 6091/2/GE2/22 [Turn over] Section A [50 marks] Answer all the questions in this section. 1 A boy rides a sled down a slope. W is the combined weight of the boy and the sled. N is the normal reaction force from the slope on the sled and the boy. R is the resistive force on the boy and the sled. Fig. 1.1 (a) Describe the force that forms an action-reaction pair with N. ………………………………………………………………………………………...... [1] (b) As the boy descends the slope, his velocity increases. Using ideas about forces, explain the effect this has on his acceleration. ……………………………………………………………………………………………… ……………………………………………………………………………………………... ……………………………………………………………………………………..…… [2] (c) The boy wants to go faster down the same slope on his sled. Without modifying the sled, suggest how he can go faster. ………………………………………………………………………………………..…..… ………………………………………………………………………………………..… [1]

3 6091/2/GE2/22 [Turn over (d) The combined weight of the boy and sled is 600 N. The boy is traveling at a constant speed down the slope. By means of a scaled diagram, determine the magnitude of R. force R = …………………………… [3]

4 6091/2/GE2/22 [Turn over] 2 A student is sitting on a chair as shown in Fig. 2.1. Fig. 2.1 The student tips his chair back to the position shown in Fig. 2.2. Fig. 2.2 (a) Explain how the pressure exerted by the chair on the floor in Fig. 2.1 compares with the pressure exerted by the chair in Fig. 2.2. ………………...……………………………………………………………………..…….. ……………………………………………………………………………………..……….. ………………………………………………………………………………………...... [2] (b) Explain why the chair in Fig. 2.2 is unstable. …………………………………………………………………………………………….... ……………………………………………………………………………………..……….. …………………………………………………………………………………….……. [2] (c) In the second experiment, the student blows into a U-tube manometer to measure

5 6091/2/GE2/22 [Turn over the pressure of his breath. Atmospheric pressure is 1.0 x 105 Pa. Density of mercury is 13 600 kg/m3. Gravitational field strength is 10 N/kg. Fig. 2.3 shows the manomet