ACS Exp Prelim 2024 P2_final

This document consists of 21 printed pages. PRELIMINARY EXAMINATION 2024 YEAR 4 EXPRESS PHYSICS 6091 / 02 Friday 2 August 2024 1 hour 45 minutes READ THESE INSTRUCTIONS FIRST Write your index number and name 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. Section B Answer only one of the two alternative questions in this section. 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. Unless otherwise stated, take gravitational field strength, g, to be 10 N kg-1. For Candidate’s use (Section B): Circle the question you would like the examiner to mark for Section B. You may circle only one of the options. Q11 Either Q11 Or Index Number Name For Examiner’s use Section A Section B Sig. Fig. penalty Unit penalty TOTAL

Y4Exp Physics Prelim 2024P2 Page 2 of 21 Section A Answer all the questions in this section. 1 A car approaches a set of traffic lights. The lights change to red at time t = 0 s. Fig. 1.1 shows how the speed of the car changes with time. The car starts to slow down a short time after the lights change to red. (a) Using Fig 1.1, (i) state the time between the lights changing to red and the car starting to slow down. [1] (ii) determine the average speed of the car from time t = 0 s to t = 4.0 s. Average speed = ___________________ [2] (b) Describe the motion of the car between time t = 4.0 s to t = 7.0 s. [2] Fig. 1.1

Y4Exp Physics Prelim 2024P2 Page 3 of 21 2 Fig. 2.1 shows a type of balance that is used for measuring mass. A rigid rod , of negligible mass, is pivoted about a point 6.2 cm from the centre of a pan which is attached to one end. The object being measured is placed on the centre of this pan. A spring, attached to the rod 1.8 cm from the pivot, is attached at its other end to a fix point P. The force of the spring is directly proportional to its extension over the full range of operation of the balance. A pointer, on the other side of the pivot, is set against a millimetre scale which is a distance 52.6 cm from the pivot. When the system is in equilibrium with no mass on the pan, the rod is horizontal and the pointer indicates a reading on the scale of 86 mm. An object of mass 0.472 kg is now placed on the pan. As a result, the p