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) Calculate the total clockwise moments. clockwise moments…………………..[1]

4 AMKSS 4E PRELIM Exam 6091(Revised)/02/2024 (ii) Hence, calculate force F. Force F………………….[1] (b) As the lower arm is moved away from the body, the force F exerted by the biceps muscles acts at an angle θ to the vertical as shown in Fig 2.2. The lower arm remains horizontal and remains in equilibrium. State and explain what happens to the following quantities as angle θ is increased. No calculations are required. Fig 2.2 (i) The total anticlockwise moments; ……………………………………………………………...………………………… ………………………………………………………………………………………… ………………………………………………………………………………………[2] (ii) force F. ………………………………………………………………………………………… ………………………………………………………………………………………… ………………………………………………………………………………………[2]

5 AMKSS 4E PRELIM Exam 6091(Revised)/02/2024 [Turn Over 3. A car races from the starting line to the finishing line. Fig 3.1 shows the graph of velocity v against time t for the car. Fig 3.1 (a) Describe the motion of the car from (i) t = 0 s to t = 2 s ………………………………………………………………………………………[1] (ii) t = 2 s to t =7 s …………………………………………………………………….……………..…[1] (b) Explain how Fig 3.1 shows that the distance travelled by the object from t = 0 s to t = 2 s is shorter than the distance travelled from t = 2 s to t = 7 s. ………………………………………………………………………………………………… ………………………………………………………………………………………………[1] (c) The ventricle is one of the two chambers in the heart that collects and expels blood. The left ventricle of the heart expels blood around the body accelerates blood from rest to a velocity of 0.26 m/s. The distance travelled by the blood during this period of constant acceleration is 0.02 m/s2. (i) Sketch a speed-time graph (indicate all relevant values clearly) to depict the motion, (ii) With the aid of the sketch in (i), calculate the time taken for the motion. time taken………………[1] [1]

6 AMKSS 4E PRELIM Exam 6091(Revised)/02/2024 (iii) Hence, calculate the acceleration of the blood. acceleration…………………[1] 4. Fig 4.1 shows a roller coaster which has a mass of 250 kg. The roller coaster starts with a speed of 2.0 m/s at A which has a height of 45 m above the ground. It passes through a dip and finishes at B with a height of 30 m above the ground. The gravitational field strength is taken to be g = 10 N/kg. Fig 4.1 (a) What is the total work done by the gravitational force of the roller coaster to move from A to B? work done……………….[1] (b) The speed of the roller coaster at the end of the ride B is 13 m/s. Determine the work done by friction. work done by friction……………………..[2] (c) Suggest with a reason, one effect on the ride if the depth of the dip is increased. ………………………………………………………………………………………………… ………………………………………………………………………………………………… …………………………………………………………………………………….…………[2]

7 AMKSS 4E PRELIM Exam 6091(Revised)/02/2024 [Turn Over (d) State the law of conservation of energy. ………………………………………………………………………………………………… ………………………………………………………………………………………………… …………………………………………………………………………………….…………[1] 5. A longitudinal wave is travelling in a medium from left to right. Fig 5.1 shows the variation of the displacement y of the particles with distance x in the medium. The solid line and the dotted line show the displacement at t= 0 and t =0.882 ms respectively. The displacement at t= 0.882 ms is positive. Fig 5.1 (a) Explain what a longitudinal wave is. Give an example of a longitudinal wave. ……………………………………………………………………………………………… ………………………………………………………………………………………[2] (b) Using data from Fig 5.1, (i) State the horizontal displacement of the wave at t=0 s and t =0.882 ms. …………………………………………………………………………………[1] (ii) Using your answer from b(i), calculate the speed of the wave. speed………………………[2]

8 AMKSS 4E PRELIM Exam 6091(Revised)/02/2024 6. Fig 6.1 shows a force applied at a corner of the structure to topple it. Fig 6.1 Describe how the stability of the structure shown is different from the stability of the cube when it was whole (no cut out). Explain your answer. Change in stability…………………………………………………………………………….…. Explanation………………………………………………………………………………………... [2] 7. Fig 7.1 shows two liquids A and B of densities 1.0 g/cm3 and 0.80 g/cm3 are poured into an U-tube. The experiment is conducted on earth. Fig 7.1 (a) Calculate the height x of the liquid B above point P. x=………………………….[2] liquid A liquid B

9 AMKSS 4E PRELIM Exam 6091(Revised)/02/2024 [Turn Over (b) Explain if your answer to (a) would be different if the experiment is conducted on the moon instead. ………………………………………………………………………………………………… ………………………………………………………………………………………………[1] 8. Fig 8.1(not drawn to scale) shows a ray of light travelling from air into a glass prism. The glass prism has a refractive index of 1.50. The pathway of the light is incomplete. Fig 8.1