SCGS 2025 PHY PRELIM P3 QP

1 SINGAPORE CHINESE GIRLS’ SCHOOL PRELIMINARY EXAMINATION SECONDARY FOUR CANDIDATE NAME CLASS REGISTER NUMBER PHYSICS 6091/03 Paper 3 30 July 2025 1 hour 50 minutes Candidates answer on the Question Paper. READ THESE INSTRUCTIONS FIRST Write your name, register number and class on all the work you hand in. Give details of the practical shift and laboratory in the boxes provided. 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 tape. Answer all questions in the spaces provided on the Question Paper: scrap paper must not be used. Graph paper is provided in this Question Paper. You will be allowed to work with the apparatus for a maximum of 55 minutes for each section. You are expected to record all your observations as soon as they are made. The use of an approved scientific calculator is expected, where appropriate. You may lose marks if you do not show your working or if you do not use appropriate units. At the end of the practical, fasten all your work securely together. The number of marks is given in brackets [ ] at the end of each question or part question. This question paper consists of 17 printed pages and 3 blank pages. Shift Laboratory For Examiner’s Use 1 / 10 2 / 10 3 / 20 Total / 40 4

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3 1 In this experiment, you will investigate the force needed to pull a cylinder up a step. You are provided with: ▪ a half-metre rule ▪ a digital caliper ▪ a newton meter ▪ two 100 g slotted masses ▪ a loop of thread (a) Measure and record the thickness h of the half-metre rule, as shown in Fig. 1.1. Fig. 1.1 h = ……………………………… [1] (b) (i) Suspend the two slotted masses from the newton meter using the loop of thread as shown in Fig. 1.2. Fig. 1.2 (ii) Measure and record the total weight W of these masses. W = ……………………………… [1] half-metre rule

4 (c) Measure and record the diameter d of one of the slotted masses. Determine the radius r of this slotted mass. d = ……………………………… r = ……………………………… [1] (d) (i) Place the half-metre rule on the bench. Stand two slotted masses on their edges next to one end of the rule, with their slots at the top, as shown in Fig. 1.3. Attach the loop of thread to the masses and the newton meter, as shown in Fig. 1.3. Fig. 1.3 Pull the handle of the newton meter horizontally and at right angles to the step. The force required to just start the slotted masses rolling up the step is F. Measure and record F. F = ……………………………… [1] (ii) Determine the angle α, given by –()sin = rhα r