EJC 2022 J1 H2 PROMO QP PAPER 4 SAMPLE REPORT

©EJC 2022 9749/04/J1H2PROMO/2022 [Turn over EUNOIA JUNIOR COLLEGE JC1 PROMOTIONAL EXAMINATIONS 2022 General Certificate of Education Advanced Level Higher 2 CANDIDATE NAME CIVICS GROUP 2 2 - REGISTRATION NUMBER PHYSICS Paper 4 Practical 9749/04 12th September 2022 1 hour 30 minutes Candidates answer on the Question Paper. Additional Materials: As listed in the Confidential Instructions READ THESE INSTRUCTIONS FIRST Write your name, civics group and registration number in the spaces at the top of this page. 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 marks 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. This document consists of 10 printed pages and 2 blank pages. Shift Laboratory For Examiner’s Use 1 16 2 17 Total 33

2 ©EJC 2022 9749/04/J1H2PROMO/2022 1 In this experiment, you will investigate the motion of a loaded wooden rod. (a) (i) Set up the apparatus as shown in Fig. 1.1. Fig 1.1 Support the wooden rod by passing it through the string loop attached to the spring and also through the long string loop. Mass m1 should be 200 g and mass m2 should be 100 g. The bottom of mass m1 should be approximately 5 cm above the bench. (ii) Adjust the apparatus until the wooden rod is balanced and horizontal. The spring and long string loop should be vertical. mass m1 mass m2 bench spring stands long string loop boss rod of clamp boss rod of clamp wooden rod x y z 3 cm 3 cm short string loop short string loop

3 ©EJC 2022 9749/04/J1H2PROMO/2022 [Turn over (iii) Measure and record the distances x, y and z as shown in Fig. 1.1, where x is the distance between the loop above m1 and the spring loop, y is the distance between the spring loop and the long string loop, z is the distance between the long string loop and the loop above m2. x = ...................................................... y = ...................................................... z = ...................................................... [2] (iv) Estimate the percentage uncertainty in your value of y. percentage uncertainty = ................................................. [1] (b) Calculate C where C = m1(x + y )2 + m2z2. C = ................................................. [1] 1 2 5.9 cm 6.0 cm 6.0 cm x x x = = = 1 2 33.4 cm 33.5 cm 33.5 cm y y y = = = 1 2 44.2 cm 44.2 cm 44.2 cm z z z = = = 44.2 cm 33.5 cm 6.0 cm 0.4 100% 1.2%33.5×= 1.2% 22 52 (200)(6.0 33.5) (100)(44.2) 5.07 10 g cm C = ++ = × 525.07 10 g cm×

4 ©EJC 2022 9749/04/J1H2PROMO/2022 (c) (i) Pull the left side of the wooden rod down by 2 cm. Release the wooden rod and watch the movement. The wooden rod will move up and down again, completing a cycle as shown in Fig. 1.2. Fig 1.2 (ii) The time taken for one complete cycle is T. By timing several of these complete cycles, determine an accurate value for T. T = ................................................. [3] (iii) Calculate T2. T2 = ...................................................... [1] (iv) Justify the number of significant figures that you have given for your value of T and T2. .................................................................................................................................. .................................................................................................................................. ..............................................................................................................................[1] No of oscillations = 15 1 2 13.71 s 13.44 s 13.58 s t t t = = = 13.58 0.9053 s15T = = ( ) 222 0.9053 0.8196 sT = = 20.8196 s 0.9053 s T2 follows the significant figure of T, which follows the s.f. of the time taken for several oscillations.

5 ©EJC 2022 9749/04/J1H2PROMO/2022 [Turn over (d) Keeping distance y constant, change m2 to 50 g and repeat (a)(ii), (a)(iii), (b), (c)(i), (c)(ii) and (c)(iii). x = ...................................................... y = ...................................................... z = ...................................................... C = ...................................................... T = ...................................................... T 2 = ...................................................... [3] 1 2 1.3 cm 1.4 cm 1.4 cm x x x = = = 1 2 33.4 cm 33.5 cm 33.5 cm y y y = = = 1 2 48.9 cm 48.9 cm 48.9 cm z z z = = = 48.9 cm 33.5 cm 1.4 cm 22 52 (200)(1.4 33.5) (50)(48.9) 3.63 10 g cm C = ++ = × 523.63 10 g cm× No of oscillations = 15 1 2 11.64 s 11.98 s 11.81 s t t t = = = 11.81 0.7873 s15T = = ( ) 22 0.7873 0.6198 sT = = 20.6198 s 0.7873 s

6 ©EJC 2022 9749/04/J1H2PROMO/2022 (e) It is suggested that the relationship between T and C is T2 = kC where k is a constant. (i) Using your data, calculate two values of k. first value of k = ...................................................... second value of k = ...................................................... [2] (ii) Explain whether your results in (e)(i) support the suggested relationship. .................................................................................................................................. .................................................................................................................................. .................................................................................................................................. ............................................................................................................................. [2] [Total: 16 Marks] 162 2 1 5 0.8196 1.62 10 s g cm5.07 10k −−−= = ×× 162 2 1 5 0.6189 1.71 10 s g cm3.63 10k −−−= = ×× 162 21.62 10 s g cm −−−× 162 21.71 10 s g cm −−−× 1.71 1.62% difference in k 100%1.62 −= ×= Since percentage difference is larger than the percentage uncertainty of 1.2%, the results do not support the suggested relationship.

7 ©EJC 2022 9749/04/J1H2PROMO/2022 [Turn over 2 In this experiment, you will investigate forces in equilibrium. (a) Assemble the apparatus as shown in Fig. 2.1. The angle θ should be approximately 160°. String AB should be parallel to the bench, and the bottom of mass M should be above the bench. Mass M should have a total mass of 100 g. Use the G-clamp to secure the stand on the right. Fig 2.1 (b) (i) Measure and record the angle θ between the string attached to mass M and the string attached to the spring, as shown in Fig. 2.1. θ = …............................................° [1] (ii) Measure and record the length L of the coiled part of the spring, as shown in Fig. 2.1. L = ................................................. [1] 1 2 160 160 160 o o o θ θ θ = = = 160o 1 2 5.5 cm 5.5 cm 5.5 cm L L L = = = 5.5 cm

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