SCGS 2025 PHY PRELIM P2 QP

1 SINGAPORE CHINESE GIRLS’ SCHOOL PRELIMINARY EXAMINATION 2025 SECONDARY FOUR CANDIDATE NAME CLASS 4 REGISTER NUMBER CENTRE NUMBER INDEX NUMBER PHYSICS 6091/2 Paper 2 27 August 2025 1 hour 45 mins Candidates answer on the Question Paper. No Additional Materials are required. READ THESE INSTRUCTIONS FIRST 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. Take g = 10 ms-2 or 10 Nkg-1 unless stated otherwise. This question paper consists of 24 printed pages. For Examiner’s Use Section A 70 Section B 10 Total 80

2 Section A Answer all questions. 1 Fig. 1.1 shows the descent of a skydiver from a stationary balloon. Fig. 1.1 (not to scale) The skydiver steps off the balloon at a height of 2000 m and accelerates downwards. His speed is 52 m/s at a height of 500 m. He then opens his parachute. From 400 m to ground level, he falls at constant speed. (a) The total mass of the skydiver and his equipment is 92 kg. (i) Calculate, for the skydiver, 1. the decrease in energy in the gravitational potential store as he falls from 2000 m to 500 m, decrease in energy in the gravitational potential store = ……….……………… [2] 2. the energy in the kinetic store at the height of 500 m. energy in the kinetic store = ……….……………… [2]

3 (ii) The energy in the kinetic store at 500 m is not equal to the decrease in energy in the gravitational potential store. Explain why there is a difference in the values. ………………………………………………………………………………………………... ………………………………………………………………………………………………... ………………………………………………………………………………………….. [1] (b) State (i) what happens to the air resistance acting on the skydiver as he falls from 2000 m to 1500 m, ………………………………………………………………………………………….. [1]