ACSI 2020 Y3 IP Physics Paper2

1 Anglo-Chinese School (Independent) FINAL EXAMINATION 2020 YEAR 3 INTEGRATED PROGRAMME PHYSICS PAPER 2 Tuesday 6 October 2020 1 hour 45 minutes INSTRUCTIONS TO STUDENTS Write your index number in the box provided on the top right corner of this page. Do not open this booklet until you are told to do so. Section A Answer all questions in the spaces provided in the paper. Section B Answer all questions in the spaces provided in the paper. INFORMATION FOR STUDENTS Candidates are reminded that all quantitative answers should include appropriate units. Candidates are advised to show their answers 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 N kg-1 or 10 m s-2 Calculators are allowed for this paper. . There are 18 printed pages Marks Awarded Section Marks A B Penalty Sig. Fig. Units TOTAL SCORE Index Number Name

2 Section A [50 Marks] A1. Fig. 1.1 shows a skydiver, of mass 75 kg, falling towards the Earth at constant velocity, a long time after jumping from an aeroplane. Fig. 1.1 At time t = 0, he receives a radio signal. He opens his parachute 12 s later. Fig. 1.2 is the velocity-time graph for the skydiver. Fig. 1.2 (a) State the difference between speed and velocity. [1] .............................................................................................................................. .............................................................................................................................. 0 10 20 30 40 50 60 0 5 10 15 20 25 30 V / m s-1 time / s Earth

3 (b) The gravitational field strength g is 10 N kg-1. (i) Calculate the weight of the skydiver. [1] (ii) State the size of the air resistance acting on the skydiver between t = 0 and t = 12 s. [1] ………………………………………………………………………………… (c) For the period between t = 0 and t = 12 s, determine (i) the magnitude of the velocity of the skydiver, [1] (ii) the displacement of the skydiver. [1] (d) State (i) what happens to the air resistance as the skydiver opens his parachute. [1] .............................................................................................................................. .............................................................................................................................. (ii) the effect on the motion of the skydiver of opening the parachute. [1] .............................................................................................................................. .............................................................................................................................. (e) By t = 15 s, his para