bukit batok (2) 2020 BBSS O Prelim Sc(Phy) (5076) P2

Name: ……………………………………………. () Class: …………… Bukit Batok Secondary SchoolGCE ‘O’ LEVEL PRELIMINARY EXAMINATIONS 2020SECONDARY 4 EXPRESS / 5 NORMAL (ACADEMIC) SCIENCE (PHYSICS)Paper 2 5076 / 02 1 September 20200800−0915 h1 hour 15 minutesCandidates answer on the Question PaperNo Additional Materials are required. READ THESE INSTRUCTIONS FIRST Write your name, index number and class in the spacesprovided at the top of this page.You may use a pencil for any diagrams, graphs, tablesor rough working.Write in dark blue or black pen.Do not use staples, paper clips, highlighters, glueor correction fluid. The use of an approved scientific calculator is expected,where appropriate.You may lose marks if you do not show your workingor if you do not use appropriate units. Section AAnswerallquestions.Write your answers in the spaces provided on the questionpaper. Section BAnswer anytwoquestions.Write your answers in the spaces provided on the questionpaper. At the end of the examination, fasten all your worksecurely together.The number of marks is given in brackets [ ] at theend of each question or part question. This Question Paper consists of18printed pages.

BBSS / 2020 / O Prelim / Sec 4E5N / Sc(Physics) (5076)/ P2 Section A [45 marks]Answerallthe questions in this section.1 The linear motion of a body is represented by thespeed-time graph shown in Fig. 1.1.The mass of the body is 20 kg and its initial speedis 8.0 m/s. speedm/s Fig. 1.1Based on the data present in Fig. 1.1,(a) show that the distance travelled by the bodyis 40 m, [2] (b) determine the deceleration of the body, deceleration = …………………….m/s 2 [2] Applying past knowledge to new situations 2

BBSS / 2020 / O Prelim / Sec 4E5N / Sc(Physics) (5076)/ P2 Applying past knowledge to new situations 3

BBSS / 2020 / O Prelim / Sec 4E5N / Sc(Physics) (5076)/ P2 (c) determine the retarding force acting on the body, retarding force = ……………………. N [2] (d) show that the work done to bring the body torest is 640 J. [2] Applying past knowledge to new situations 4

BBSS / 2020 / O Prelim / Sec 4E5N / Sc(Physics) (5076)/ P2 2 A stone falls vertically from the top of a cliff into the sea, as shown in Fig. 2.1.The speed-time graph for the stone is shown in Fig.2.2.Between points A and C, the stone was falling through the air.The stone touches the sea at point C.Between points C and D, the stone was sinking verticallythrough the sea water. (a) Describe how the acceleration of the stone changesbetween points A and D. ……………………………………………………………………………………………………... …………………………………………………………………………………………….…… [2] (b) By considering the forces acting on the stone,explain why the acceleration changesbetween points A and B. ……………………………………………………………………………………………………... ……………………………………………………………………………………………………... ……………………………………………………………………………………………………... …………………………………………………………………………………………….…… [3] (c) Did the stone fall freely between points B andC? Explain your answer. …………………………………………………………………………………………….…… [1] Applying past knowledge to new s