canberra Prelim 4E5N SciPhy P2

CANBERRA SECONDARY SCHOOL 2020 Preliminary Examination Secondary Four Express / Five Normal Academic SCIENCE PHYSICS5076/02 14 Aug 20201 hour 15 minutes0830h – 0945h Name:______________________________________ () Class:________ READ THESE INSTRUCTIONS FIRST Do not open this booklet until you are told to doso. Writeyour full name, classandindexnumber inthespacesprovidedonthequestionpaperand on any separate writing papers used.Write in dark blue or black pen.You may use a pencil for any diagrams or graphs.Do not use staples, paper clips, highlighters, glueor correction fluid. Section AAnswerallquestions.Write your answers in the spaces provided on the questionpaper. Section BAnsweranytwoquestionsWrite your answers in the spaces provided in 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.FOR MARKER’S USEMarksAwarded MaxMarks Section A 45 Section B 20 Total 65

2 This question paper consists of15printed pages includingthe cover page. Setter: Mrs Olivia Ho

3 Section A [45 marks] Answerallthe questions.Write your answers in the spaces provided in the questionpaper. 1 Amarbleistossedupverticallyat aninitial speedof 10m/s. It movesuptothehighest point at t=x, before falling down and hittingthe ground after 2.5 s.The speed-time graph of the marble is shown below. The air resistance is negligible, and the gravitational field strength is 10 N/kg. (a) Describe the motion of the marble fromt= 0 tot= 2.5 s. …………………………………………………………………………………….. …………………………………………………………………………………….. …………………………………………………………………………………….. [2] (b) Calculate the value of x. x= ……………………. s[1] (c) Calculate the distance travelled by the marble beforeit reaches the highestpoint. [1]________________________________________________________________________________________________Canberra Secondary School Science Physics 5076/022020 Preliminary Examination Secondary 4 Express/ 5 Normal Academic

4 distance =…………………….m(d) Hence or otherwise, calculate the height above theground from which themarble is tossed. height =…………………….m [2] 2 The cruise ship Costa Fortuna has a mass of 50379000 kg. When it isembarkingonajourney, tugboats(T) areneededtomoveit outoftheport.Thediagram below (not to scale) shows the arrangement of two tugboats. Eachtugboat pulls with a force of 600 kN. (a) By drawing a scaled diagram, determine the magnitudeand direction of theresultant force of the two tugboats. magnitude =…………………….N [2] [1] ________________________________________________________________________________________________Canberra Secondary School Science Physics 5076/022020 Preliminary Examination Secondary 4 Express/ 5 Normal Academic

5 direction =…………………….………….[1](b) Hence, calculate the acceleration of Costa Fortunaas it leaves the dock. acceleration =…………………….m/s 2 [1] 3 The diagram below shows a rollercoaster. The cart, when fully loaded, has amass of 500 kg. At positionA, the roller coaster has a speed of 2m/s. (a) Calculate the gravitational potential energy of thecart atA. gravitational potential energy =…………………….J [1] (b) Calculate the kinetic energy of the cart atA. kinetic energy =…………………….J [1] (c) Calculate the speed of the cart atB. ________________________________________________________________________________________________Canberra Secondary School Science Physics 5076/022020 Preliminary Examination Secondary 4 Express/ 5 Normal Academic

6 speed =…………………….m/s [2](d) A brake is applied at B. Given that the length ofthe track fromBtoCis150 m, calculate the force needed for the cart tostop atC. force = ……………………. N [2] 4 The diagram below shows a man holding an iron ball in his hand. Theelbow, X, isthepivot.Fistheforceexertedbythebicepmuscle,whileWistheweight of theironball.d1 andd2 aretheperpendiculardistanceofforcesFandWfrom the pivot respectively.d1 is2.0 cm whiled2 is 35.0 cm. (a) ExplainwhytheforceFismuchgreater thanWwhentheironball isheldat the indicated position. …………………………………………………………………………………….. …………………………………………………………………………………….. …………………………………………………………………………………….. [1] (b) Calculatethegreatest weight of theironball if themaximumforceexertedby the bicep is 1000 N. ________________________________________________________________________________________________Canberra Secondary School Science Physics 5076/022020 Preliminary Examination Secondary 4 Express/ 5 Normal Academic

7 weight = ……………………. N [2]5 The diagram below shows the wave fronts produced ina ripple tank The plunger moves up and down 3 times per second toproduce a transversewave. (a) Describe the difference between transverse and longitudinal waves. …………………………………………………………………………………….. …………………………………………………………………………………….. …………………………………………………………………………………….. [1] (b) Given the distance between pointAandBis 20 cm,calculate the speed ofwave in the shallow region. speed = ……………………. cm/s [2] (c) Giventhatthewavelengthofthewaveinthedeepregionis7cm,stateandexplain how the speed of the wave changes. …………………………………………………………………………………….. …………………………………………………………………………………….. …………………………………………………………………………………….. [2] ________________________________________________________________________________________________Canberra Secondary School Science Physics 5076/022020 Preliminary Examination Secondary 4 Express/ 5 Normal Academic

8 6 The diagram below shows the image (I) of an object(O) formed by a thinconverging lens. (a) State two properties of the image formed. …………………………………………………………………………………….. [1] (b) Locate and label the position of the lens (L) andprincipal focus (F) bydrawing suitable rays on the diagram. [3] (c) Describe what happens to the properties of the imageformed as the objectis shifted until it is very close to the lens. …………………………………………………………………………………….. …………………………………………………………………………………….. …………………………………………………………………………………….. …………………………………………………………………………………….. …………………………………………………………………………………….. [2] ________________________________________________________________________________________________Canberra Secondary School Science Physics 5076/022020 Preliminary Examination Secondary 4 Express/ 5 Normal Academic

9 7 The figure below shows a light ray incident on a triangularglass prism. (a) Explain why the light ray doesnotbend at surfaceXY. …………………………………………………………………………………….. …………………………………………………………………………………….. [1] (b) If the refractive index of the glass prism is 1.51,calculate the critical angleof glass. critical angle = ……………………. o [1] (c) Describe and explain what happen to the ray incidenton surfaceXZ. …………………………………………………………………………………….. …………………………………………………………………………………….. …………………………………………………………………………………….. …………………………………………………………………………………….. [2] ________________________________________________________________________________________________Canberra Secondary School Science Physics 5076/022020 Preliminary Examination Secondary 4 Express/ 5 Normal Academic

10 8 Leidenfrost effecttakesplacewhenawaterdropletfallsontoaveryhotsurface.As shown in the diagrambelow, athinlayer of steamformsbeneaththewaterdroplet. (a) Explain, usingkinetictheoryofmatter,whyaspherical liquiddropletisableto change its shape as shown in the diagram. …………………………………………………………………………………….. …………………………………………………………………………………….. …………………………………………………………………………………….. [1] (b) State what happen to the internal energies of the water droplet as thetemperature remains at 100 o C. …………………………………………………………………………………….. …………………………………………………………………………………….. …………………………………………………………………………………….. [2] (c) Explain, in terms of thermal transfer, why the heatingis much slowed downdue to Leidenfrost effect. …………………………………………………………………………………….. …………………………………………………………………………………….. …………………………………………………………………………………….. [1] ________________________________________________________________________________________________Canberra Secondary School Science Physics 5076/022020 Preliminary Examination Secondary 4 Express/ 5 Normal Academic