USS_2024_SCIPHY_Sec 4E_PRELIM_P2

USS PRELIM 2024/5086/02/Sci Physics Page 1 of 14 UNITY SECONDARY SCHOOL PRELIMINARY EXAMINATION SECONDARY FOUR SCIENCE (PHYSICS, CHEMISTRY) 5086/02 Paper 2 Physics 28 Aug 2024 1 hour 15 minutes Additional Materials: Nil MARKS /65 READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluids. Write your Name, Form Class, Index Number and Teaching Group on the Question Paper and Answer Sheet in the spaces provided. Section A Answer all questions. Write your answers in the spaces provided. Section B Answer one question. Write your answers in the spaces provided. The number of marks is given in brackets [ ] at the end of each question or part question. This paper consists of 14 printed pages, including this cover page. [Turn over Name: Form Class Index No Teaching Group O

USS PRELIM 2024/5086/02/Sci Physics Page 2 of 14 Section A Answer all the questions in the spaces provided. 1 A man makes a parachute jump. Initially, he falls without opening his parachute. Then he opens his parachute and falls to the ground. Fig. 1.1 Fig. 1.1 shows how his speed changes with time after jumping. (a) State the two times in which the man has a non-zero uniform acceleration in between. The man has a non-zero uniform acceleration between .................. s and .................. s [1] (b) State the time at which the man opens his parachute. .........................................................................................................................................[1] (c) Calculate the distance through which the man falls between 50 s and 70 s. distance = .............................. m [3]

USS PRELIM 2024/5086/02/Sci Physics Page 3 of 14 2 A rocket has a mass of 500 kg. The gravitational field strength is 10 N/kg. (a) Calculate the smallest upward force that is needed for the rocket to take off. State the unit. force = .............................. [2] (b) The rocket reaches a speed of 600 m/s in 3.0 s. (i) Calculate the average acceleration of the rocket. State the unit. acceleration = .............................. [2] (ii) Calculate the average force needed to give this acceleration. Assume that the mass of the rocket remains constant. State the unit. force = .............................. [