QSS 2024 4E Physics Prelim P2

NAME: CLASS: INDEX NO: QUEENSWAY SECONDARY SCHOOL PRELIMINARY EXAMINATION 2024 SECONDARY 4 EXPRESS PHYSICS 6091/02 Paper 2 Theory 22 August 2024 1 hour 45 minutes Candidates answer on the Question Paper. No Additional Materials are required. 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, 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. 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 26 printed pages. [Turn over For Examiner's Use Section A /70 Q /10 TOTAL /80 Parent’s Signature:

2 Section A Answer all questions. 1 Two forces, 100 N and 50 N, act on an 8.0 kg box as shown in Fig. 1.1. The box is initially at rest. Fig. 1.1 (a) By using a suitable scale diagram, determine the magnitude of the resultant force acting on the box. resultant force = ........................................ [2] (b) Hence, determine the acceleration of the box. acceleration = ........................................ [1] (c) Calculate the speed of the box after 6.0 s. speed = ........................................ [1] [Total: 4] 50 N 100 N 75° 60°

3 2 (a) A cyclist applies a vertical force F of 110 N on a pedal of her bicycle, as shown in Fig. 2.1. Fig. 2.1 As she travels along, the pedal moves through a circle of radius 8.0 cm. For the pedal in the position shown in Fig. 2.1, the line of action of the force F is 5.0 cm from the pivot. (i) Calculate the moment of force F about the pivot. moment = …………………………… [2] (ii) The pedal moves from position A to position B, as shown in Fig. 2.1. Explain, in terms of moments, why the downward force F applied at A will have a different effect from the same force applied at B. ………………………………………………………………………………………. ………………………………………………………………………………………. …………………………………………………………………………………… [1] pedal chain pivot F = 110 N 5.0 cm A B

4 (b) A boy stands with his right foot and right shoulder touching a wall, and his centre of gravity as shown in Fig. 2.2. Fig. 2.2 Explain why the boy cannot raise his left foot off the ground with