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 situations 5

BBSS / 2020 / O Prelim / Sec 4E5N / Sc(Physics) (5076)/ P2 3 Fig. 3.1 shows a ball hanging at rest from a stringthat ispulled to one side by a horizontal force F.The weight of the ball is 80 N.The magnitude of force F is 60 N.(a) In the space below, draw a vector diagram todeterminethe resultant of F and the weight of the ball.State clearly the scale that you have used, themagnitudeof the resultant force and the angle between theresultantforce and the weight of the ball. scale: ……………………. magnitude of resultant force: …………………….N angle between resultant force and weight of ball:…………………….°[3] (b) Deduce the magnitude of the tension along regionPQ of the string.Give a reason for your deduction. ………………………………………………………………………………...…………………… ………………………………………………………………………………...…………………… ….……………………………………………………………………………………………… [2]Applying past knowledge to new situations 6

BBSS / 2020 / O Prelim / Sec 4E5N / Sc(Physics) (5076)/ P2 4 (a) State what is meant by thecentre of gravityof a body. ………………………………………………………………………………...…………………… …………………………………………………………………………………………………. [1] (b) The stability of a lorry is tested, as shownin Fig. 4.1.The lorry was lefton a tilting ramp, and theramp tilted. Fig. 4.1 (i) On Fig. 4.1, draw the line of action of theweight of the lorry. [1] (ii) Explain why the lorry falls over if the rampis tilted any further. ………………………………………………………………………………………………. ………………………………………………………………………………………………. ………………………………………………………………………………………………. …………………………………………………………………………………………… [2] Applying past knowledge to new situations 7

BBSS / 2020 / O Prelim / Sec 4E5N / Sc(Physics) (5076)/ P2 (c) Fig. 4.2 shows a uniform metre rule, of weight1.0 N, being suspended freely by athread at the 70 cm mark. It is balanced by an unknownweight W hanging from the80-cm mark. Fig. 4.2 (i) Determine the moment due to the weight of themetre rule about the 70 cm mark. moment = …………………….Ncm [3] (ii) Hence, determine the magnitude of the unknownweight W. magnitude of W = …………………….N [2] Applying past knowledge to new situations 8

BBSS / 2020 / O Prelim / Sec 4E5N / Sc(Physics) (5076)/ P2 5 Fig. 5.1 (not to scale) shows a man making a bungeejump.Themanstartshisjumpfromaplatform60maboveariver. FromtheplatformtopointA,theman falls freely. At point A, the elastic rope tiedto the man’s feet becomes taut.From point A to point B, the man decelerates as he falls.The lowest point the man reaches is point B, whichis 4.0 m above the surface of the river.The mass of the man is 80 kg.The gravitational field strength is 10 N/kg. Fig. 5.1 (a) Determine the change in the man’sgravitational potential energy(GPE) whenhefallsfrom the platform to point B. change in GPE = …………………….J [2] Applying past knowledge to new situations 9

BBSS / 2020 / O Prelim / Sec 4E5N / Sc(Physics) (5076)/ P2 (b) The maximum kinetic energy of the man is 23 kJ.Calculate his maximum speed. maximum speed = …………………….m/s [2] (c) Describe the energy changes to the man and therope as the man falls from A to B. …………...………………………………………………………………………………………… ………………..…………………………………………………………………………………… ………………..…………………………………………………………………………………… …………………..………………………………………………………………………………… …………………...…………………………………………………………………………….. [3] Applying past knowledge to new situations 10