GMSS Prelim P2 Ans

Candidate Name Class Index Number _______________________________________________________________ PHYSICS Paper 2 Physics 6091/02 Sec 4 Express Additional materials : NIL 1 hour 45 minutes 13 August 2024 READ THESE INSTRUCTIONS FIRST Write your name, index number and class on all the work you hand in. Write in dark blue or black pen. You may use an HB pencil for any diagrams or graphs Do not use staples, paper clips, highlighters, glue or correction fluid. Section A Answer all questions. Section B Answer all questions. Question 12 has a choice of parts to answer. Candidates are reminded that all quantitative answers should include appropriate units. You are advised to show all your working in a clear and orderly manner. 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. Acceleration due to gravity, g, is assumed to be 10 m/s2 unless otherwise specified. For Examiner’s Use Section A /70 Section B /10 Total /80 This document consists of 19 printed pages and 1 blank page. [Turn over Geylang Methodist School (Secondary) Preliminary Examination 2024 ANSWERS

2 GMS(S)/Physics/P2/Prelim/2024/4E Section A Answer all questions. 1 Fig. 1.1 shows the velocity-time graph for the first 80 s after an object is dropped from rest at a height of 2000 m above the ground. Fig. 1.1 The object has a mass of 9.0 kg. (a) State the acceleration of the object at 0 s. acceleration = ……………10 m/s2………… [1] (b) Describe the motion from 0 to 80 s. From 0 to 40 s, object is moving downwards with a decreasing acceleration. [1] From 40 to 60 s, object is moving downwards with a constant velocity of 40 m/s. [1] From 60 to 80 s, object is moving upwards [1] with a decreasing deceleration [1] (c) Describe the energy transfer when the object is travelling at terminal velocity. Energy is transferred from the gravitational potential store of the object [1] to the internal stores of the surrounding and the object. [1] (d) Calculate the maximum possible air resistance acting on the object when the object is falling at terminal velocity. Max air resistance = weight = 9.0 x 10 = 90 N [1] Maximum air resistance = ……………….………[1]

3 GMS(S)/Physics/P2/Prelim/2024/4E 2 A 7.0 kg picture frame is being suspended from a nail by a string. The string forms two segments L1 and L2, as shown in the Fig. 2.1. L1 and L2 make an angle of 35° and 60° with the vertical respectively. Fig. 2.1 (a) In the space below, draw a vector diagram to determine the tension forces in segments L1 and L2. Specify the scale used. diagram [1], scale [1] scale = ………………… force in L1 = 61 N [1]…,