RVHS 2024 J2 H2 Physics Prelim P4

River Valley High School Page 1 of 18 H2 Physics 9749 JC2 Preliminary Examinations 2024 . RIVER VALLEY HIGH SCHOOL JC2 PRELIMINARY EXAMINATIONS H2 PHYSICS 9749 PAPER 4 22 AUG 2024 2 HRS 30 MIN CANDIDATE NAME CENTRE NUMBER S INDEX NUMBER CLASS 2 3 J INSTRUCTIONS TO CANDIDATES DO NOT OPEN THIS BOOKLET UNTIL YOU ARE TOLD TO DO SO. Read these notes carefully. Write your name, class and index number above. Candidates answer 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. 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. Answer all questions. The number of marks is given in brackets [ ] at the end of each question or part question. SHIFT LABORATORY FOR EXAMINERS’ USE 1 / 21 2 / 12 3 / 10 4 / 12 TOTAL / 55 This document consists of 18 printed pages.

River Valley High School Page 2 of 18 H2 Physics 9749 JC2 Preliminary Examinations 2024 1 In this experiment, you will investigate the spring constant of a spring using the principle of moments. (a) (i) Measure and record the length l0 of the coiled section of the unstretched spring using the 30 cm ruler. l0 = ……………………….. [1] (ii) Hang a mass m of 300 g as shown in Fig. 1.1 below and measure the length l1 of the stretched spring. Calculate the extension, (l1 − l0). l1 − l0 = ……………………….. [1] (iii) The spring constant of the spring k is given by the expression 10 mgk = −ll where m is the mass used in (a)(ii) and g = 9.81 m s−2. Use your answer in (a)(ii) to calculate the spring constant of the spring k. k = ……………………….. [1] l0 l1 Fig. 1.1 rod of clamp retort stand boss

River Valley High School Page 3 of 18 H2 Physics 9749 JC2 Preliminary Examinations 2024 (b) Disconnect the previous setup and set up the apparatus as shown in Fig. 1.2. The distance x is the distance between the 300 g mass to the pivot, and the distance L is the distance between the pivot to the spring. Set x to be approximately 40 cm. Adjust the apparatus such that the metre rule is always parallel to the bench. (i) Displace the right end of the metre rule downwards over a short distance and release it. Allow the metre rule to oscillate about the pivot. Record x and determine the period T of these oscillations. x = ……………………….. T = ……………………….. [1] (ii) Estimate the percentage uncertainty in T. percentage uncertainty in T = ……………………….. [1] boss rod of clamp loop of s