2024 SCGS Prelim_P2

1 SINGAPORE CHINESE GIRLS’ SCHOOL PRELIMINARY EXAMINATION 2024 SECONDARY FOUR CANDIDATE NAME CLASS 4 REGISTER NUMBER CENTRE NUMBER INDEX NUMBER PHYSICS 6091/2 (Revised) Monday 26 August 2024 1 hour 45 mins Candidates answer on the Question Paper. No Additional Materials are required. READ THESE INSTRUCTIONS FIRST Section A Answer all questions. Section B Answer one question only. Question 11 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. The number of marks is given in brackets [ ] at the end of each question or part question. Take g = 10 ms-2 or 10 Nkg-1 unless stated otherwise. This question paper consists of 21 printed pages and a blank page. For Examiner’s Use Section A 70 Section B 10 Total 80

2 SECTION A Answer all the questions in this section. 1 A car of mass m is travelling along a straight, horizontal road at a constant speed v. At time t = 0, the driver of the car sees an obstruction in the road ahead of the car and applies the brakes. The car does not begin to decelerate at t = 0. (a) Explain why the car does not begin to decelerate at t = 0. .......................................................................................................................................... ……………………………………………………………………………………………………. .......................................................................................................................................... [1] Fig. 1.1 is the distance–time graph for the car from t = 0. Fig. 1.1 (b) Describe the motion of the car throughout the 5 s of travel. …………………………………………………………………………………………………… …………………………………………………………………………………………………… …………………………………………………………………………………………………… [3] (c) Determine the initial speed v of the car. v = ………………….. [2] 0 0 20 40 60 1 2 3 4 time / s distance / m 5

3 (d) When the car is decelerating, there is a constant resistive force F on the car due to the brakes. The deceleration of