NYGH 2020-S3EOY-IP Physics P2

Class Register Number Name 南洋女子中学校 NANYANG GIRLS’ HIGH SCHOOL End-of-Year Examination 2020 Secondary Three PHYSICS 1 hour 45 minutes Paper 2 Theory Paper 10:15 – 12:00 Wednesday 14 October 2020 No additional materials are required. READ THESE INSTRUCTIONS FIRST Do not open this booklet until you are told to do so. Write your name, register number and class in the spaces at the top of this page and on any separate answer paper used. Write in dark blue or black ink. You may use a pencil for any diagrams or graphs. Do not use correction fluid or tape. Section A (40 marks) Answer all questions. Write your answers in the spaces provided on the question paper. Section B (30 marks) Answer all questions. Question 11 has a choice of parts to answer: 11 Either or 11 Or. Write your answers in the spaces provided on the question paper. At the end of the examination, circle 11 Either or 11 Or in the grid on the right to indicate which question you have answered. INFORMATION FOR CANDIDATES The intended number of marks is given in the brackets [ ] at the end of each question or part question. You are advised to spend no longer than one hour on Section A and no longer than 45 minutes on Section B. Candidates are reminded that all quantitative answers should include appropriate units. 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 use of an approved scientific calculator is expected, where appropriate. The acceleration due to gravity (or gravitational field strength) g is taken to be 10 m s−2 (or 10 N kg−1) near the Earth’s surface. Examiner’s Use Section A (40 marks) 1 2 3 4 5 6 7 8 Section B (30 marks) 9 10 11 Either 11 Or Paper 2 (70 marks) Paper 1 (30 marks) Overall % This document consists of 19 printed pages and 1 blank page. Setters: AJL & TPY NANYANG GIRLS’ HIGH SCHOOL

2020 End-of-Year Examination Secondary Three 2 Nanyang Girls’ High School Setters: AJL & TPY Physics II Section A (40 marks) Answer all questions. 1 Fig. 1.1 shows a thin flexible rod clamped to a table and a mass M attached to the rod at a distance L from the base of the rod. When the mass is displaced sideways slightly and then released, it oscillates between A and B. Fig. 1.1 A student measures the period of oscillations T for different values of the mass M and a fixed value of the length L. (a) The student measures the time for 10 oscillations and divides this time by 10 to obtain the period T. Explain why this is a better method than measuring the time for one oscillation. ……………………………………………………………………………………………… ……………………………………………………………………………………………… ………………………………………………………………………………………..….[1] (b) The student repeats the procedure in (a) another time and then calculates the average of the two periods. Explain the advantage of doing this. ……………………………………………………………………………………………… ……………………………………………………………………………………………… ………………………………………………………………………………………..….[1] table A B clamp thin rod L M

2020 End-of-Year Examination Secondary Three 3 Nanyang Girls’ High School Setters: AJL & TPY Physics II [Turn over (c) Fig. 1.2 shows the graph of T against M plotted by the student. Fig. 1.2 The student has a hypothesis that the period T is directly proportional to the mass M. Explain how two features of the graph in Fig. 1.2 support or does not support her hypothesis. ……………………………………………………………………………………………… ……………………………………………………………………………………………… ……………………………………………………………………………………………… ……………………………………………………………………………………………… ………………………………………………………………………………………..….[2] M / g 0 100 200 300 400 500 × × T / s × 1.6 1.4 1.2 1.0 0.8 × × × × × × × ×

2020 End-of-Year Examination Secondary Three 4 Nanyang Girls’ High School Setters: AJL & TPY Physics II 2 A ball is projected vertically upwards with an initial velocity of 44.1 m s-1. (a) Calculate the time taken for the ball to reach its maximum height. time taken = ……………………. [1] (b) State an assumption you made in calculating part (a). ……………………………………………………………………………………………… ………………………………………………………………………………………..….[1] (c) Calculate the maximum height reached by the ball. maximum height = ……………………..[2] (d) Calculate the distance travelled by the ball during the first 6.0 s of its motion. distance travelled = ……………………..[2]

2020 End-of-Year Examination Secondary Three 5 Nanyang Girls’ High School Setters: AJL & TPY Physics II [Turn over 3 A cyclist is travelling along a straight level road. She reaches a speed of 10 m s-1 by accelerating at 2.0 m s-2 for 3.0 s. (a) Calculate the initial velocity of the cyclist, just before she starts accelerating. velocity = ……………………..[2] (b) The cyclist continues with the same acceleration for a further 2.5 s. Calculate the velocity 5.5 s after she started to accelerate. velocity = ……………………..[1] (c) Draw a velocity-time graph for the motion of the cyclist in this duration of 5.5 s using the axes provided in Fig. 3.1. [1] Fig. 3.1 velocity / m s-1 time / s 0 2 4 6 15 10 5

2020 End-of-Year Examination Secondary Three 6 Nanyang Girls’ High School Setters: AJL & TPY Physics II (d) Calculate the distance travelled by the cyclist during this duration of 5.5 s. distance = ……………………..[2] 4 A block B of mass 1.10 kg is connected by a string over a smooth pulley to a load M of mass 0.20 kg. B moves to the right on a smooth horizontal surface when it is pulled by M falling vertically as shown in Fig. 4.1. Fig. 4.1 (a) On Fig. 4.2 below, draw and label all the forces acting on the block B as it moves to the right in Fig. 4.1. [1] Neglect air resistance. Fig. 4.2 pulley M B string B

2020 End-of-Year Examination Secondary Three 7 Nanyang Girls’ High School Setters: AJL & TPY Physics II [Turn over (b) Calculate the magnitude of the acceleration experienced by B and M in Fig. 4.1. acceleration = ……………………..[2] (c) Calculate the tension in the string. tension = ……………………..[1] (d) Calculate the net force acting on the falling load M. net force = ……………………..[1] (e) As the block B accelerates to the right in Fig. 4.1, the string suddenly breaks. Describe and explain any change to the motion of B just after the string breaks. ……………………………………………………………………………………………… ……………………………………………………………………………………………… ……………………………………………………………………………………………… ……………………………………………………………………………………………… ………………………………………………………………………………………..….[2]

2020 End-of-Year Examination Secondary Three 8 Nanyang Girls’ High School Setters: AJL & TPY Physics II 5 Fig. 5.1 shows a trolley used for lifting and transporting heavy boxes. The force to lift the box is derived from a downward force F at Y of the lifting bar XY . The centre of gravity of the lifting bar is at the pivot P. Fig. 5.1 (a) Suggest one advantage of pivoting the bar at the centre of gravity of the lifting bar XY. ……………………………………………………………………………………………… ……………………………………………………………………………………………… ……………………………………………………………………………………………[1] (b) Calculate the force F necessary to maintain the lifting bar in the position shown in Fig. 5.1, if the weight of the box and its contents is 500 N. F = ……………………..[2] (c) Explain the purpose of having PY