AMKSS Prelim P2

[Turn Over Candidate Name Form Class Index Number ANG MO KIO SECONDARY SCHOOL PRELIMINARY EXAMINATION 2024 SECONDARY FOUR EXPRESS PHYSICS 6091(Revised)/02 Paper 2 Theory 23 August 2024 1 hour 45 minutes Setter: Mdm Jessica Lew Candidates answer on the Question Paper. No Additional Materials are required. SECTION A READ THESE INSTRUCTIONS FIRST Write your Name, Class and Index Number in the spaces at the top of this paper. Write in dark blue or black pen in the spaces provided on the Question Paper. You may use a soft pencil for any diagrams, graphs or rough working. Do not use staples, paper clips, highlighters, glue or correction fluid/tape. Section A Answer all questions. Section B Answer only one question. Candidates are reminded that all quantitative answers should include appropriate units. The use of an approved scientific calculator is expected, where appropriate. Candidates are advised to show all their working in a clear and orderly manner, as more marks are awarded for sound use of Physics than for correct answers. The number of marks is given in brackets [ ] at the end of each question or part question. For Examiner’s use Section A Section B TOTAL This document consists of 19 printed pages and 1 blank page

2 AMKSS 4E PRELIM Exam 6091(Revised)/02/2024 Answer all the questions. 1. Fig 1.1 shows the vertical forces acting on a helium-filled weather balloon just before lift-off. Fig 1.1 The balloon experiences an upward vertical force equal to 120 N. The weight of the balloon and its contents is 90 N. The amount of horizontal force provided by the wind is 18 N. (a) By means of a scaled diagram, determine the resultant force acting on the balloon and the angle this resultant makes with the horizontal. Scale………………………………. Resultant Force……………………….. Direction……………………………………………………………[5] horizontal force 18N

3 AMKSS 4E PRELIM Exam 6091(Revised)/02/2024 [Turn Over (b) The same setup is brought to the moon. State and explain the change (if any) to the resultant force calculated in (a). ………………………………………………………………………………………………… ……………………………………………………………………………………………… [2] (c) The balloon experiences resistive forces as it falls through air on earth. Suggest a factor to increase this resistive force. ………………………………………………………………………………………………… ……………………………………………………………………………………………….[1] 2. Fig 2.1 shows a human arm lifting an object. Fig 2.1 (a) The lower arm is horizontal and its centre of gravity is 0.150 m from the elbow joint. The weight of the lower arm is 18 N. The biceps muscle exerts a vertical force F on the arm. The lower arm bone is 0.040 m. The weight of the object held in the hand is 30 N and its centre of gravity is 0.460 m from the elbow joint. The arm is in equilibrium. (i)