RI 2024 J2 H2 Physics Prelim P4 Answers

Centre Number Class Index Number Name Class S3016 RAFFLES INSTITUTION 2024 Preliminary Examination PHYSICS Higher 2 Paper 4 Practical 9749/04 12 August 2024 2 hours 30 minutes READ THESE INSTRUCTIONS FIRST Write your index number, name and class in the spaces provided 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. Candidates answer on the Question Paper. You will be allowed a maximum of one hour to work with the apparatus for Questions 1 and 2, and maximum of one hour for Question 3. You are advised to spend approximately 30 minutes for Question 4. 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 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 For Examiner’s Use 1 / 12 2 / 10 3 / 22 4 / 11 Total / 55 This document consists of 21 printed pages and 3 blank pages.

2 ©Raffles Institution 9749/04 1 In this experiment, you will investigate the force required to lift different masses. Fig. 1.1 (a) Set up the apparatus as shown in Fig. 1.1. Hang the pulleys to the rods of the clamps. The top of the pulleys should be approximately 42 cm above the bench. Pass the string through the pulleys. Attach the end of the string with a small loop to the mass hanger and the other end to a ball of modelling clay. The mass of the ball is 1m and the mass of the mass hanger is 2m . Ensure that the ball is suspended above the bench while the mass hanger is resting on the base of the retort stand with the string taut. Adjust the distance between the retort stands until 0h is about 5 cm above the bench. Measure and record 0h . 0h = 0.050 m or 5.0 cm ball m1 bosses bench mass hanger m2 rod of clamp rod of clamp string h0 pulleypulley retort stand

3 ©Raffles Institution 9749/04 [Turn over (b) Raise the ball to a height h above the bench as shown in Fig. 1.2. Release the ball such that it moves in a circular path. Ensure that the string is taut and the mass hanger is resting on the base of the retort stand at the point of release of the ball. The minimum height of the ball required to just lift the mass hanger off the base of the retort stand is h. Fig. 1.2 Measure and record h. Calculate h where 0h h h = − . Minimum height 1 0.074 mh = ; 2 0.075 mh = ( )1 2 0.074 0.075 0.075 mh = + = 0 0.075 0.050 0.025 mh h h = − = − = h = 0.075