2022 CHIJ Phy Prelims P2

CONVENT OF THE HOLY INFANT JESUS SECONDARY Preliminary Examination in preparation for the General Certificate of Education Ordinary Level 2022 CANDIDATE NAME CLASS INDEX NUMBER PHYSICS Paper 2 Theory Candidates answer on the Question Paper. No Additional Materials are required. 6091/02 15 September 2022 1 hour 45 minutes READ THESE INSTRUCTIONS FIRST Write your class, index number and name on all the work you hand in. Write in dark blue or black ink. You may use an HB pencil for any diagrams or graphs. Do not use staples, paper clips, 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. 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. 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. This document consists of 20 printed pages and 2 blank pages. [Turn over

2 CHIJSec/2022/OLevelPrelim/6091/02 Section A Answer all the questions in this section. 1 A ball rolls down a slope as shown in Fig. 1.1. The metre rule shows the position of the ball at times, t = 0 s, 1.0 s, 2.0 s and 3.0 s. Fig. 1.1 (a) Explain how Fig. 1.1 shows that the ball is accelerating. ………....................................................................................................................................... ................................................................................................................................. [1] (b) Calculate the average speed of the ball between t = 1.0 s and 3.0 s. average speed = ………………………………… [2] (c) Two of the forces that act on the ball are air resistance and weight. The ball accelerates as it rolls down the slope. State what, if anything, happens to (i) air resistance, …..………...……………………………………………………………………... (ii) weight, …………..………...………………………………………………………………….. [2]

3 [Turn over CHIJSec/2022/OLevelPrelim/6091/02 2 Two trains P and Q travel between the same two stations on parallel tracks. Fig. 2.1 shows the distance-time graphs of the two trains. Fig. 2.1 Train Q starts its journey at time t = 0 minutes and train P starts its journey at t = 10 minutes. (a) Explain how Fig. 2.1 shows that, when moving, train P has a greater speed than train Q. ………....................................................................................................................................... ………....................................................................................................................................... ............................................................................................................................................. [2] (b) What is the distance between the two stations? distance = ………………………….. [1] (c) Calculate the speed of train Q when it is moving. Give your answer in km/h. speed = ………………………….. [2] (d) Another train R makes the same journey. It travels at the same speed as train P. Train R leaves 30 minutes later than train P. On Fig. 2.1, draw the distance-time graph for the train R. [1]

4 CHIJSec/2022/OLevelPrelim/6091/02 3 Two tugboats are pulling a ship in a harbour. Fig. 3.1 represents the view from above and shows the directions of the forces on the ship. Fig. 3.1 (not to scale) The pulling force exerted by the two tugboats are 80 kN each. (a) In the space below, draw a labelled diagram to show the resultant of these two forces. Determine the magnitude of the resultant force. State the scale used. scale: ……………………………. resultant force = …….……………………… [3] 80 kN 80 kN

5 [Turn over CHIJSec/2022/OLevelPrelim/6091/02 (b) The engines of the ship are not operating and the water in the harbour is stationary. The ship is moving in a straight line in the direction of the resultant force exerted by the two tugboats. It is traveling at a constant speed. Explain, in terms of the forces acting, why the ship is moving in a straight line at constant speed. ………………………………………………………………………………………………………… ………………………………………………………………………………………………………… ………………………………………………………………………………………………………. [2]

6 CHIJSec/2022/OLevelPrelim/6091/02 4 Fig. 4.1 shows a painter standing on a wooden plank, directly above the right-hand support. Fig. 4.1 The plank has length 3.6 m, width 0.35 m and thickness 0.025 m. The gravitational field strength g is 10 N/kg and the mass of the plank is 23 kg. (a) Calculate the density of the wood from which the plank is made. density = ………………………………….. [2] (b) The centre of gravity of the plank is in the middle of the plank at a distance of 1.3 m from each of the supports. Calculate (i) the weight of the plank, weight = …………..………………………. [2] (ii) the moment due to the weight of the plank about the right-hand support. moment = …………………………………… [2] (c) The painter moves further to the right along the plank and the plank starts to rotate clockwise about the right-hand support. Explain why the plank rotates clockwise. ………………………………………………………………………………………………………… ………………………………………………………………………………………………………… ………………………………………………………………………………………………………. [2] wooden plank support support centre of gravity

7 [Turn over CHIJSec/2022/OLevelPrelim/6091/02 5 Fig 5.1 shows the journey of a cyclist from point A to B. Point A and B are at the same height. Fig 5.1 The cyclist starts from rest at A and pedals up and over a hill. Near the bottom of the hill, she starts to brake and come to rest at B. (a) Describe the energy changes that take place as she pedals up the hill at constant speed. ………………………………………………………………………………………………………… ………………………………………………………………………………………………………. [2] (b) Explain how the law of conservation of energy applies to the complete journey from A to B. ………………………………………………………………………………………………………… ………………………………………………………………………………………………………. [1] (c) At one point in the journey, the gravitational potential energy of the cyclist has increased by 5700 J. The total mass of the cyclist and bicycle is 60 kg. The gravitational field strength is 10 N/kg. Calculate the height above A of the cyclist at this point. height above A = ………………………….. [2]

8 CHIJSec/2022/OLevelPrelim/6091/02 6 Fig. 6.1 shows a syringe that contains a gas at the same pressure as the air outside. The piston moves freely along the cylinder without any friction. The mass of gas remains constant. Fig. 6.1 As the syringe is cooled from 90 °C to 10 °C, the piston moves inwards. It stops moving when the temperature is steady. State how the physical quantities of the cooled air have changed when the piston stops moving at 10 °C, compared to the initial temperature of 90 °C. Complete Table 6.1, using the terms “greater”, “the same” or “less”. Table 6.1 the average distance between the gas molecules the pressure of the gas after the piston stops the average speed of the gas molecules the frequency of the collision between the gas molecules and the piston the average diameter of the gas molecules [5] piston gas cylinder sealed end

9 [Turn over CHIJSec/2022/OLevelPrelim/6091/02 7 (a) Fig. 7.1 shows part of a page from a student’s notebook. The student