ASRJC 2024 JC2 H2 Physics Prelim P4 Soln

9749/04/ASRJC/2024/Prelim [Turn Over 1 Name: _____________________________ ( ) Class: 24 /_____ 2024 JC2 Preliminary Examination PHYSICS Higher 2 9749/04 Paper 4 Practical Monday 26 August 2024 2 hours 30 minutes Candidates answer on the Question Paper. Additional Materials: As listed on the Confidential Instructions READ THESE INSTRUCTIONS FIRST Write your name, class index number and class 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, graphs or rough working. Do not use staples, paper clips, glue or correction fluid. Answer all questions. Write your answers in the spaces provided on the question paper. The use of an approved scientific calculator is expected, where appropriate. You may lose mark if you do not show your working or if you do not use appropriate units. Give details of the practical shift and laboratory where appropriate in the boxes provided. 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. Shift Laboratory This document consists of 15 printed pages and 1 blank page. For Examiner’s Use Paper 4 (55 marks) 1 2 3 4 Total (55 marks) ANDERSON SERANGOON JUNIOR COLLEGE

9749/04/ASRJC/2024/Prelim 2 1 In this experiment, you will investigate the motion of a sphere launched from a ramp. (a) Set up the apparatus as shown in Fig. 1.1. Adjust the height of the clamp so that the launch angle  is approximately 15°. Do not bend the ramp throughout the experiment. (b) (i) Measure and record , as shown in Fig. 1.1.  = …………….………..……[1] (ii) Measure and record the height h1 of the mark above the bench, as shown in Fig. 1.2. h1 = …………….………..…… For Examiner’s Use Fig. 1.1 (not to scale) 15 M1 0.280 m Fig. 1.2 (not to scale)

9749/04/ASRJC/2024/Prelim [Turn Over 3 (iii) Measure and record the height h2 of the end of the ramp, as shown in Fig. 1.2. h2 = …………….………..……..[1] (iv) Calculate the speed v of the sphere when it leaves the ramp using the expression 122 ( )v g h h=− where g = 9.81 m s−2. v = …………….………..……..[1] (c) Justify the number of significant figures you have given for your value of v. …………………………………………………………………………………………………..…. ……………………………………………………………………………………………......... [1] (d) (i) Place the sphere on the ramp at the mark. Release the sphere. (ii) Measure and record the horizontal distance R from the end of the ramp to the landing position of the sphere, as shown in Fig. 1.3. 0.230 0.250 2 0.240 m 12RRR 2 += += = R = …………….……….. [2] 0.085 m M2 1.96 m s−1 A1 P1 0.240 m Fig. 1.3 (not to scale) v = 2(9.81)(0.280 0.085)− = 1.96 m s−1 Since the number of s.f. for (h1 − h2) is 3, hence v is 3 s.f.. M3 M4 For Examiner’s Use

9749/04/ASRJC/2024/Prelim 4 (e) Estimate the percentage uncertainty in your value of R. percentage uncertainty = 0.01 100%0.24 = 2.1 % percentage uncertainty = ........................... [1] (f) By lowering the clamp, increase the launch angle  to approximately 25°. Repeat (b) and (d) using the sphere.  = …………….…..……..…… h1 = ......................................... h2 = ......................................... v = ......................................... 0.185 0.195 2 0.190 m R += = R = .....................................[2] 2.1 % 25 0.210 m 0.089 m 0.190 m 1.54 m s−1 v = 2(9.81)(0.210 0.089)− = 1.54 m s−1 A2 4 M5 4 M6 4 For Examiner’s Use

9749/04/ASRJC/2024/Prelim [Turn Over 5 (g) It is suggested that the relationship between R, v and  is R = k v cos  where k is a constant. (i) Using your data, calculate two values of k. first value of k = ................................... second value of k = ................................... [1] (ii) Explain whether your results support the suggested relationship. Percentage difference in k = k 0.136 0.126x100% 100% 7.9%k 0.126 − =  = …………………………………………………………………………………................... …………………………………………………………………………………................... ……………………………………………………………………………….…………...[1] (iii) It is not accurate to draw a conclusion based on only two readings as in g(ii). Suggest a way the method can be changed. …………………………………………………………………………………................... …………………………………………………………………………………................... ……………………………………………………………………………….…………...[1] The criterion is percentage difference in k ≤ percentage uncertainty in R. Since the % difference in k value is more than the % uncertainty in R, the suggested relationship is not valid. A4 0.126 s A3 0.136 s A5 8 cos Rk v = k k first 0.240 0.126s1.96cos15==  k k second 0.190 0.136s1.54cos25==  Take 6 sets of readings by varying  and plot a graph of R against v cos to test the relationship. If the graph is a straight line passing through the or igin, the relationship is valid. For Examiner’s Use

9749/04/ASRJC/2024/Prelim 6 (h) (i) State one significant source of error in this experiment. ….……………………………………………………………………………….................. …………………………………………………………………………………................... ……………………………………………………………………………….…………...[1] (ii) Suggest an improvement that could be made to the experiment to address the source of error identified in (h)(i). You may suggest the use of other apparatus or a different procedure. …………………………………………………………………………………................... …………………………………………………………………………………................... ……………………………………………………………………………….…………...[1] (i) A student is investigating the motion of a sphere launched horizontally from the ramp with a range of different speeds v. It is suggested that the square of the horizontal distance R from the end of the ramp to the landing position of the sphere is directly proportional to v. Plan an investigation on this relationship using the same apparatus. Your account should include your experimental procedure, control of variables, and how you would use your results to test the relationship. …………………………………………………………………………………............................ ……………………………………………………………………………….…………................ …………………………………………………………………………………............................ …………………………………………………………………………………............................ …………………………………………………………………………………............................ ……………………………………………………………………………….…………................ …………………………………………………………………………………............................ …………………………………………………………………………………............................ …………………………………………………………………………………............................ ……………………………………………………………………………….…………................ …………