YJC H1 PHY P2 Questions

1 8866/YJC/2016/JC2 Preliminary Examinations/Paper 2 YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE Candidate’s Name ………… ………………………………. CTG ………….… YISHUN JUNIOR COLLEGE JC 2 PRELIMINARY EXAMINATIONS 2016 PHYSICS 8866/2 HIGHER 1 19 August 2016 Paper 2 Friday Structured Questions 2 hours Candidates answer on the Question Paper. No Additional Materials are required. READ THESE INSTRUCTIONS FIRST Do not open this booklet until you are told to do so. Write your name and CTG in the spaces provided above. Write in dark blue or black pen on both sides of the paper. You may use an HB pencil for any diagrams or graphs. Do not use staples, paper clips, glue or correction fluid. The use of an approved scientific calculator is expected, where appropriate. Section A Answer all questions. Section B Answer any two questions. 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. This question paper consists of 21 printed pages. Paper 2 Section A Q1 /5 Q2 /11 Q3 /6 Q4 /6 Q5 /6 Q6 /6 Section B Q7 /20 Q8 /20 Q9 /20 Penalty Total /80 % Parent’s Signature …………………..

2 8866/YJC/2016/JC2 Preliminary Examinations/Paper 2 Data speed of light in free space, c = 3.00  108 m s-1 elementary charge, e = 1.60  10-19 C the Planck constant, h = 6.63  10-34 J s unified atomic mass constant, u = 1.66  10-27 kg rest mass of electron, me = 9.11  10-31 kg rest mass of proton, mp = 1.67  10-27 kg Acceleration of free fall g = 9.81 m s -2 Formulae uniformly accelerated motion, s = ut + 2 1 at2 v2 = u2 + 2as work done on/by a gas, W = p V hydrostatic pressure, p =  g h resistors in series, R = R1 + R2+………. Resistors in parallel, R 1 ........11 21  RR =

3 8866/YJC/2016/JC2 Preliminary Examinations/Paper 2 Section A Answer all the questions in this section. 1 A student times the fall of a small metal ball. Data for the time t taken for the ball to fall through a vertical distance h from rest are given below. h = (348 ± 1) cm t = (0.842 ± 0.001) s Use these data to determine (a) the acceleration of free fall, g to five significant figures. g = ……………………………….. m s −2 [2] (b) the value of g and its uncertainty, to an appropriate number of significant figures. g = ……………………………… ± ……………………….. m s −2 [3]

4 8866/YJC/2016/JC2 Preliminary Examinations/Paper 2 2 The graph of Fig 2.1 shows the variation with time t of the velocity v of a ball from the moment it is thrown with velocity v of 26 m s1 vertically upwards. Fig. 2.1 (a) State the time at which the ball reaches its maximum height. time = ………….………. s [1] (b) Just after the ball leaves the thrower’s hand, it has a downward acceleration of approximately 20 m s 2 which is much larger than g. Explain how this is possible. .................................…………………………………………………………….………… .................................…………………………………………………………….………… ...................................…………………………………………………………...…… [2] -20 -10 0 10 20 30 012345 v / m s 1 t / s

5 8866/YJC/2016/JC2 Preliminary Examinations/Paper 2 (c) It is found that the acceleration at t = 1.8 s is g. Explain how this is possible. .................................…………………………………………………………….………… .................................…………………………………………………………….………… ...................................…………………………………………………………...…… [2] (d) Sketch the acceleration-time graph and displacement-time graph in Fig. 2.2 for the motion from t = 0 to t = 4 s, following the sign convention taken for the velocity-time graph in Fig. 2.1. The value of g is marked out in the acceleration-time graph. Label other critical values. [6] Fig. 2.2 a / m s2 t / s  g g 0 s / m t / s0

6 8866/YJC/2016/JC2 Preliminary Examinations/Paper 2 3 A light helical spring is suspended vertically from a fixed point, as shown in Fig. 3.1. Different masses are suspended from the spring. The weight W of the mass and the length L of the spring are noted. The variation with the weight W of the length L is shown in Fig. 3.2 (a) On Fig. 3.2, shade the area in the graph that represents the energy stored in the spring when the weight on the spring is increased from zero to 5.0 N. [1] L spring mass Fig. 3.1 L / cm W / N 8 6 4 2 0 0 1 2 3 4 5 Fig. 3.2

7 8866/YJC/2016/JC2 Preliminary Examinations/Paper 2 (b) A mass of weight 4.0 N is suspended from the spring. When the mass is stationary, a force is then applied to pull the mass downwards through a distance of 1.0 cm and held stationary. At this position, (i) Determine the total length of the spring. length = ……………………………. cm [1] (ii) Determine the total elastic potential energy of the spring. elastic potential energy = ………………………………… J [2] (iii) Determine the force required to hold the mass stationary. Force = ……………………………….. N [2]

8 8866/YJC/2016/JC2 Preliminary Examinations/Paper 2 4 A common game in carnivals is the “high striker” whereby a player uses a hammer to hit a target pad at one end of a lever in order to launch a puck at the other end. The player wins if the puck hits the bell at the top of a tower. This is illustrated in Fig. 4.1. In one such carnival, the hammer and puck weigh 9.00 kg and 0.40 kg respectively. The bell is located 5.00 m above the puck. A student plays the game and just manages to ring the bell. (a) Determine the gain in gravitational potential energy of the puck. gain in gravitational potential energy = ………… J [1] (b) Suppose that 75% of the final kinetic energy of the hammer is transformed into thermal and sound energy, calculate the speed of impact of the student’s hammer with the lever. speed of impact = ……………. m s 1 [3] (c) Suggest and explain one modification in which the game can be made more difficult to win. ...............