CGS 2025 Physics P2 QP

This paper consists of 20 printed pages including this cover page. Class: Index No.: Name: CRESCENT GIRLS’ SCHOOL SECONDARY FOUR PRELIMINARY EXAMINATION PHYSICS 6091 / 02 Paper 2 Structured and Free Response 02 September 2025 1 hour 45 minutes READ THESE INSTRUCTIONS FIRST Write your name, index number and class in the spaces provided at the top of this page and on all separate answer sheets used. Write in dark blue or black pen. You may use an HB pencil for any diagrams or graphs. Do not use staples, paper clips, glue or correction fluids. Section A Answer all questions. Write your answers on the spaces provided. Section B Answer one question. Write your answers on the spaces provided. 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. For Examiners Use Section Marks A / 70 B [ ] / 10 S.F. penalty Total / 80

2 ⏹ ⌞ ⌟ 6091/02/CGS/2025 Section A Answer all questions in this section. 1 Two small tugboats are pulling a ship in a harbour. Fig. 1.1 represents the view from above and shows the directions of the forces on the ship. Fig. 1.1 (not to scale) Each of the tugboats is exerting a horizontal force of 49 kN on the ship. (a) By drawing a scaled vector diagram, determine the resultant of these two forces. Label your forces. resultant = …………………………………. [ 3]

3 ⏹ ⌞ ⌟ 6091/02/CGS/2025 (b) The engines of the ship are not operating and the water in the harbour is stationary. The ship is moving at a constant speed in a straight line in the direction of the resultant of the two forces exerted by the tugboats. Explain, in terms of the forces acting, why the ship is moving in a straight line at constant speed. [3] (c) Both cables connecting the tugboats and the ship are detached at the same instant. The mass of the ship is 2.4 × 107 kg. Determine the magnitude of the acceleration, and its direction relative to the motion of the ship, at this instant. magnitude = …………………………………. [ 1] direction relative to motion of the ship = …………………………………. [ 1] [Total: 8 marks]

4 ⏹ ⌞ ⌟ 6091/02/CGS/2025 2 Fig. 2.1 shows a man sitting on a chair resting on four legs. Fig. 2.2 shows the same man with his chair tilted backwards slightly. Fig. 2.1 Fig. 2.2 The man has a weight of 650 N and the chair has a weight of 20 N. Each base area of each leg is 5.0 cm2. (a) Calculate the pressure exerted on the floor when the chair is in the position shown in Fig. 2.1. pressure = [2] (b) State and explain, without any calculations, how the pressure of the chair on the floor differs in the two positions. [2] (c) In Fig. 2.2, the chair and man are about to fall over. On Fig. 2.2, draw an “ X” to indicate the position of the centre of gravity of the chair and man. [1]

5 ⏹ ⌞ ⌟ 6091/02/CGS/2025 (d) The chair and man fall over if the chair is tilted backwards more than in Fig. 2.2. Explain why. [2] [Total: 7 marks]

6 ⏹ ⌞ ⌟ 6091/02/CGS/2025 3 Fig. 3.1 shows the plan of a bedroom and part of the main room of a house . Other parts of the house are not shown. Fig. 3.1 The temperatures of the main room, the bedroom and the outside of the house are shown in Fig. 3.1. Fig. 3.2 shows the thermal energy transfers to the bedroom in one hour. through the door and walls from the main room 60 000 J through the walls from the outside 1 500 000 J through the window 200 000 J Fig. 3.2 (a) State the key process of heat transfer to the bedroom. [1] (b) Explain why more thermal energy enters the bedroom from the outside of the house than from the main room. [1]

7 ⏹ ⌞ ⌟ 6091/02/CGS/2025 (c) Suggest two ways to reduce the different heat transfers into the bedroom through the walls from the outside. 1. 2. [2] (d) An air conditioner is installed in each room to keep the room at the temperatures shown in Fig. 3.1. The air conditioners are installed at the top of each room. Explain how this set-up helps to cool the air in the rooms. [3] [Total: 7 marks]

8 ⏹ ⌞ ⌟ 6091/02/CGS/2025 4 Both sound and ultrasound are longitudinal waves that travel in solids, liquids and gases. Both consist of compressions and rarefactions. (a) (i) State how sound differs from ultrasound. [1] (ii) Explain what is meant by a wave and state the direction of vibration of the wave particles in relation to the wave motion. [3] (b) Fig. 4.1 represents a longitudinal wave of frequency 25 kHz traveling in oil. Fig. 4.1 (full scale) (i) On Fig. 4.1, 1. mark one point at the centre of a rarefaction and label it R. [1] 2. draw a double -headed arrow to indicate a distance that is equal to one wavelength of the wave. [1] (ii) Measure the length of the arrow drawn in (b)(i)(2). and use it to determine the speed of the wave in the oil. speed = [2] [Total: 8 marks]

9 ⏹ ⌞ ⌟ 6091/02/CGS/2025 5 A girl rubs a polythene rod with a dry cloth. The polythene rod becomes positively charged and the cloth becomes negatively charged. (a) Describe, in terms of the movement of electrons, how the polythene rod becomes positively charged. [2] (b) There is an electric field around the charged rod. (i) Explain what is meant by an electric field. [1] (ii) State the direction of this electric field around the charged rod with reference to the rod. [1] (c) The charged rod is placed near a stream of water from a tap as shown in Fig. 5.1. Fig. 5.1 The stream of water bends because the rod is charged. Explain how the stream of water bends in Fig. 5.1. [2] [Total: 6 marks]

10 ⏹ ⌞ ⌟ 6091/02/CGS/2025 6 (a) Fig. 6.1 and Fig. 6.2 show views of a wire carrying a current downwards through a horizontal board. Fig. 6.1 Fig. 6.2 (viewed from above) On Fig. 6.2, draw the magnetic field due to the current in the wire. [3] (b) The wire is coiled around an iron core and is connected to a power source to form an electromagnet, as shown in Fig. 6.3. With the switch open, a beam of electrons is projected between the poles of the electromagnet and produces a bright spot on a special screen. The whole set-up is enclosed in a vacuum. Fig. 6.3 The switch of the circuit is subsequently closed. (i) State the magnetic pole produced at the end marked X. [1]