HYSS PLM PHYSICS 6091 4G3 P2 [QP]

[Turn Over HUA YI SECONDARY SCHOOL PRELIMINARY EXAM 2024 4-G3 NAME CLASS INDEX NUMBER PHYSICS 6091/02 PAPER 2 (XX) 21 August 2024 1 hour 45 minutes Additional Materials: Nil READ THESE INSTRUCTIONS FIRST Write your Name, Class, and Index Number 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. Write your answers in the spaces provided. Section B Answer one question. Write your answers in the spaces provided. Section A 70 Section B 10 Total 80 Candidates are reminded that all quantitative answers should include appropriate units. The use of an 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 21 printed pages and 1 blank page. © HYSS 2024 No part of this document may be reproduced in any form or transmitted in any form or by any means without the prior permission of Hua Yi Secondary School. Setter: Mrs Lim Kai Xin

2 2024_4-G3_ PRELIMS_ PHYSICS _PAPER 2 Section A [70 marks] Answer all the questions in the spaces provided. 1 Fig. 1.1 shows a child sliding down a slope on a snow sledge. Fig.1.1 At time t = 0, the child and the sledge begin to move down the hill. When the child sees a wall ahead, he applies the brake and eventually comes to a stop. Fig. 1.2 is the velocity time graph for the journey. Fig.1.2 velocity m/s time / s sledge child brake wall

3 2024_4-G3_ PRELIMS_ PHYSICS _PAPER 2 (a) Explain, using ideas about forces, why the speed varies in the way shown in Fig. 1.2 between t = 0 and t = 26 s. …………..................................................................................................................... …………..................................................................................................................... …………..................................................................................................................... …………..................................................................................................................... …………..................................................................................................................... [2] (b) Explain how the graph shows that the child and the sledge reach terminal velocity. ……………………………………………………………………………………………….. ……………………………………………………………………………………………….. [1] (c) At t = 26 s, the front of the sledge is 35 m from the wall. Determine if the child is able to come to a stop before hitting the wall. ……………………………………………………………………………………………….. ……………………………………………………………………………………………….. [2] (d) State the main energy changes during time t = 24 s to t = 26 s. …………..................................................................................................................... …………..................................................................................................................... [1] (e) At t = 26 s, when the brakes are first applied, the child jerks forward on the sledge. Explain why. …………..................................................................................................................... …………..................................................................................................................... [1] Total: [7]

4 2024_4-G3_ PRELIMS_ PHYSICS _PAPER 2 2 Fig. 2.1 shows the velocity -time graph of an object that was thrown vertically upwards on an unknown planet X. The object falls back down due to planet X’s gravity and rebounds once from the ground. Fig. 2.1 (a) State the time which the ball rebounds from the ground. time = ……………..……………….. [1] (b) Explain how the graph indicates that energy is lost during the rebound. ……………………………………………………………………………………………….. ……………………………………………………………………………………………….. [1] (c) Determine the gravitational field strength of planet X. gravitational field strength = …………………………… [2] (d) Explain how the graph in Fig. 2.1. suggests that planet X does not have an atmosphere. ……………………………………………………………………………………………….. ……………………………………………………………………………………………….. [1] Total: [5] velocity m/s

5 2024_4-G3_ PRELIMS_ PHYSICS _PAPER 2 3 Fig 3.1 shows a crane with a boom angle of 30 ° used on construction sites to lift heavy loads. The length of the crane boom is 45.0 m and the perpendicular distance of the load to the pivot X is 22.0 m. Table 3.1 shows the maximum load the crane can support at different boom angles. 22.0 m Fig. 3.1 (a) Explain why the maximum load increases as the boom angle increases. ……………………………………………………………………………………………….. ……………………………………………………………………………………………….. ……………………………………………………………………………………………….. ……………………………………………………………………………………………….. [2] (b) (i) Calculate the maximum moment that the crane can support when the boom angle is 30 o. maximum moment = …………………………. [1] (ii) Given that the counterweight is 5.0 m away from the pivot X when the boom angle is 30 o, calculate the weight of the counterweight. weight = ……………………… [1] Total: [4] Table 3.1 boom angle / o maximum load / N 30 11 500 45 14 000 60 20 000 45.0 m crane boom counterweight boom angle = 30 ° load

6 2024_4-G3_ PRELIMS_ PHYSICS _PAPER 2 4 Fig. 4.1 shows a 4.0 kg block being released from point P. The track is frictionless except for the rough surface between Q and R, which is 2.0 m long. The block slides down the track, hits a spring at S and compresses the spring 0.20 m from its equilibrium position before coming to rest momentarily. Fig. 4.1 (a) Calculate the speed of the block at Q. speed = ………….…..……….. [2] (b) After the block compressed the spring by 0.20 m from its equilibrium position, the energy stored in the spring is 4.5 J. Calculate the average frictional force acting against the block along the rough surface. average frictional force = ………………………. [2] Total: [4]

7 2024_4-G3_ PRELIMS_ PHYSICS _PAPER 2 5 Fig. 5.1 shows a water gun that makes use of pressure exerted on a trigger to spray water out of a nozzle. Fig. 5.1 (a) The cross -sectional areas of the piston and nozzle are 2.0 cm 2 and 0.08 cm 2 respectively. If a force of 5 N is exerted on the trigger, calculate the force exerted on the water leaving the nozzle. force = ………………….……….. [2] (b) When the force of 5 N is applied, the piston moved a distance of 0.6 cm. (i) Determine the mass of water moved by the piston, given that the density of water is 1 g / cm3. mass = ………….….…………… [1] (ii) Calculate the work done on the water in the water gun. work done = ………….…...……….. [1] (c) The volume of water leaving the water gun per secon