2025 AMKSS EOY 3E SCI PHY P2

[Turn Over Candidate Name Form Class Index Number ANG MO KIO SECONDARY SCHOOL END-OF-YEAR EXAMINATION 2025 SECONDARY THREE EXPRESS SCIENCE (PHYSICS, CHEMISTRY) 5086/02 Paper 2 Physics 7 October 2025 1 hour 15 minutes Setter: Mr Chow Yan Bin Candidates answer on the Question Paper. No Additional Materials are required. READ THESE INSTRUCTIONS FIRST Write your Name, Class and Index Number in the spaces at the top of this paper. You may use an HB pencil for any diagrams, graphs or rough working. Write in dark blue or black pen. Do not use staples, paper clips, highlighters, glue or correction fluid/tape. 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. Section A Answer all questions. Write your answers in the spaces provided on the question paper. Section B Answer one question. Write your answers on the spaces provided. The number of marks is given in brackets [ ] at the end of each question or part question. This document consists of 16 printed pages.

2 AMKSS 3E EOY Exam 5086/02/2025 Section A Answer all the questions in this section. 1 (a) Complete Table 1.1 by indicating the missing prefixes, symbol and value. Table 1.1 prefix symbol value kilo k 103 109 μ 10−6 mega M [3] (b) Circle all the scalar quantities in the list below. velocity time density energy pressure weight [1] [Total: 4]

3 AMKSS 3E EOY Exam 5086/02/2025 [Turn Over 2 A student uses a metre rule to determine the diameter of a golden sphere. Fig. 2.1 shows five golden spheres lined up beside each other with two wooden blocks supporting them at the sides. (a) Determine the average diameter of one golden sphere. average diameter = ………………….... cm [2] (b) The student realised that this method is not accurate. State the instrument he should use instead and explain why it is better to use this instrument to measure the diameter of one golden sphere. ……………………………………………………………………………………………… ……………………………………………………………………………………………… ……………………………………………………………………………………………… ………………………………………………………………………………………............. [2] [Total: 4] 1 2 3 4 5 cm Ball bearings Wooden block wooden block golden spheres cm 1 2 3 4 5 Fig. 2.1

4 AMKSS 3E EOY Exam 5086/02/2025 3 Fig. 3.1 shows a car of mass 850 kg travelling on a road. The forward driving force has a constant value of 2500 N. Fig. 3.1 Fig. 3.2 shows a graph of the resultant force that acts on the car against time. Fig. 3.2 (a) Name two resistive forces acting on the car. 1 .………………………………………………………………………………………… 2 ...………………………………………………………………………………………. [2] (b) Using Fig. 3.2, describe the speed of the car (i) from 0 s to 10 s, …………………………………………………………………………….……... ………………………………………………………………………………….... [2] (ii) from 10 s to 14 s. ………………………………………………………………………………….... [1] resultant force / N 0 500 1000 1500 2000 2500 3000 0 2 4 6 8 10 12 14 time / s forward driving force resistive forces Fig 3.2

5 AMKSS 3E EOY Exam 5086/02/2025 [Turn Over (d) Determine the time when the resistive force is 700 N. time = ........................................ s [2] [Total: 10] (c) (i) Explain, in terms of the forces acting, why the resultant force acting on the car decreases as the speed of the car increases. ………………………………………………………………………………….... …………………………………………………………………………………… [1] (ii) State the time interval when the total resistive force is a maximum value. Explain your answer. Time interval ………………………………………………………………………………….... explanation ……………………………………………………………………….................. .........…………………………………………………………………………….. [2]

6 AMKSS 3E EOY Exam 5086/02/2025 4 A student visited a farm to learn about modern farming techniques. The farmer drives a vehicle, as shown in Fig. 4.1, with six wheels across the field. (a) State what is meant by pressure. ……………………………………………………………………………………..……… …………………………………………………………………………………………. [1] (b) Assume that the weight of the vehicle is distributed uniformly over the six wheels. The area of each wheel in contact with the ground is 0.040 m2. Each wheel exerts a pressure of 199 kPa on the ground. (i) Calculate the force exerted by each wheel on the ground, leaving your answer in kN. force = ……...………………………....... kN [2] (ii) Using your answer in (b)(i), calculate the total weight of the vehicle, leaving your answer in kN. total weight = ……...….…….………...... kN [2] Fig. 4.1

7 AMKSS 3E EOY Exam 5086/02/2025 [Turn Over 4 (c) The vehicle went on to a soft marshy ground. The farmer stops the vehicle and steps down on to the soft marshy ground with both his boots touching the ground. (i) The farmer has a weight of 850 N and the total area of the sole of his boots is 5.0  10−4 m. Calculate the pressure exerted by the famer on the soft marshy ground. pressure = ……......………………......…… [2] (ii) Explain why the farmer is more likely to sink into the soft marshy ground than the vehicle. ………………………………………………………………………………..…… ……………………………………………………………………………..……… ……………………………………………………………………………..……… …………………………………………………………………………………. [2] (iii) Suggest one way in which the farmer could avoid sinking into the soft marshy ground. ……………………………………………………………………………..………. …………………………………………………………………………………. [1] [Total: 10]

8 AMKSS 3E EOY Exam 5086/02/2025 5 (a) Fig. 5.1 shows a force F on an object at point P. The object is free to rotate about an axis at point X that is perpendicular to the page. Fig. 5.1 Besides force F, state the other quantity used to calculate the moment of F about the axis at point X. Label this quantity on Fig. 5.1. ………………………………………………………………………………….……… [1] (b) A worker carries a ladder on his shoulder which acts as a pivot. Fig. 5.2 shows that the ladder is in a horizontal equilibrium position. Fig. 5.2 The ladder is wider at one end than at the other end. The weight of the ladder is 90 N. (i) Explain why the centre of gravity of the ladder is not half -way along its length. ………………………………………………………………………………….…. ………………………………………………………………………………….…. [1] F object X P ladder centre of gravity