2022 NCHS Phy Prelims P2

1 Name: Register Number: Class: NAN CHIAU HIGH SCHOOL PRELIMINARY EXAMINATION 2022 SECONDARY FOUR EXPRESS PHYSICS 6091/02 Paper 2 23 Aug 2022 Tuesday 1 hour 45 mins Candidates answer on the Question Paper. No additional Materials are required. READ THESE INSTRUCTIONS FIRST Write your name, class and register number in the spaces provided on the question paper. You may use an HB pencil for any diagrams, graphs, tables or rough working. Write in dark blue or black pen. Do not use staples, paper clips, highlighters, glue or correction fluid or tape. The use of an approved calculator is expected, where appropriate. You may lose marks if you do not show your working or if you do not use appropriate units. Section A: 50 marks Answer all questions. Section B: 30 marks Answer all questions. Question 12 has a choice of parts to answer. The total mark for this paper is 80. Take gravitational field strength of Earth = 10 N kg-1 and acceleration due to gravity = 10 m s-2. This question paper consists of 20 printed pages, including this cover page. For Marker’s Use Parent’s Signature: ________________

2 Section A Answer all the questions in this section 1 Fig. 1.1 (not drawn to scale) shows the side view of a steel ball 2.0 kg suspended by 2 strings attached to the ceiling. String 1 and string 2 are 35o and 55o from the vertical respectively. The tensions in strings 1 and 2 are T1 and T2 respectively. Fig. 1.1 (Side view) (a) State and explain if the ball is at equilibrium. [2] ………………………………………………………………………………………………………. ………………………………………………………………………………………………….….... …………………………………………………………………………………………………...….. (b) Calculate the weight of the ball. [1] (c) Draw the weight and label it as W in Fig. 1.1. [1] 2.0 kg T2T1 ceiling 35 º 55 º

3 (d) By drawing a scaled vector diagram below, determine the magnitudes of tension T1 and tension T2. [3] Tension T1 = _____________ Tension T2 = _____________

4 2 A rock is travelling in a straight line downwards at high speed in air when it enters a deep pond. Fig. 2.1 shows the speed-time graph of the rock from time t = 0 s to time t = 50 s. Fig. 2.1 (a) On Fig 2.1, mark on the graph with a point and label it D, when the rock has increasing deceleration. [1] (b) Calculate the deceleration of the rock at t = 25 s. [2] (c) Describe and explain what happens to the motion of the rock at t = 40 s. [2] …………………………………………………………………………………………