2023 AHS Physics Prelim Paper 2

1 Anglican High School 2023_S4_Prelim_Phy_P2 [Turn over Anglican High School Secondary Four Preliminary Examination 2023 CANDIDATE NAME CLASS INDEX NUMBER PHYSICS 6091/02 Paper 2 Theory 28 Aug 2023 1 hour 45 min Candidates answer on the Question Paper. No additional Materials are required. READ THESE INSTRUCTIONS FIRST Write your name, index number and class on all your work. Write in dark blue or black pen on both sides of the paper. You may use a soft pencil for any diagrams or graphs. Do not use staples, paper clips, glue or correction tape. Section A Answer all questions. Section B Answer all questions. Question 11 has a choice of parts to answer. Candidates are reminded that all quantitative answers should be given to appropriate units and rounded off to the appropriate number of significant figures. Candidates are advised to show all their working in a clear and orderly manner, as more marks are awarded for sound use of Physics than for correct answers. This Question Paper consists of 18 printed pages including this cover page. 4 Assessment noted by : _________________________ Name of Parent/Guardian _________________________ Signature of Parent/Guardian Date : ____________________ Marks Section A Section B s.f. error Total (80) S4

2 Anglican High School 2023_S4_Prelim_Phy_P2 [Turn over Section A Answer all the questions in this section. 1 Ali throws an object vertically upwards from the top of his head. Fig . 1.1 shows the displacement-time graph of the motion of the object from the time it was released from the top of his head to the time it hits the ground. (a) Describe the motion of the object from time t = w seconds to t = y seconds in terms of its displacement and direction. …………………………………………………………………………………………………........ …………………………………………………………………………………………………........ …………………………………………………………………………………………………........ …………………………………………………………………………………………………... [2] (b) Using a letter “H”, mark and label a point in Fig. 1.1 which shows Ali’s height. [1] (c) In the space below, sketch a velocity-time graph of the object’s full motion. Assume air resistance is negligible. Label the area under the graph corresponding to the distance travelled clearly with the letters p, q, and/or p+q. [3] velocity / ms -1 t / s 0 w y

3 Anglican High School 2023_S4_Prelim_Phy_P2 [Turn over 2 An object of mass m possesses gravitational potential energy when it is raised above a reference level in the gravitational field of the Earth. Fig. 2.1 below represents the relationship between the gravitational potential energy EP of an object and the vertical height h of the object above the reference level. Take gravitational field strength as 10 N / kg. (a) Using Fig. 2.1, write down the EP of the object when it is 3.25 m above the reference level. EP = ………............. [1] (b) (i) State the physical quantity represented by the gradient of the graph. ……………………………………………………………………………………..….. [1] (ii) Draw another line on Fig. 2.1 to represent the relationship between Ep and h for another object that has a smaller mass. [1] (c) The object placed at a height of 3.25 m above the reference level is then dropped from rest. Assuming that air resistance is negligible, calculate the speed of the object just before it reaches the ground. speed = ………............. [2] Fig. 2.1 EP / J h / m 10 90 80 70 60 50 40 30 20 0 1.0 2.0 4.0 3.0

4 Anglican High School 2023_S4_Prelim_Phy_P2 [Turn over 3 Fig. 3.1 shows a 0.60 kg mass hanging at rest from a spring. (a) State what is meant by the centre of gravity of an object. …………………………………………………………………………………………………........ …………………………………………………………………………………………………... [1] (b) There are two forces acting on the mass at this position. On Fig. 3.1, draw the two forces acting on the mass and write down the name of each of the force clearly next to each arrow. [2] (c) The mass is pulled downwards and held at rest . Using ideas about forces, state and explain what happens to the upward force. …………………………………………………………………………………………………........ …………………………………………………………………………………………………........ …………………………………………………………………………………………………........ …………………………………………………………………………………………………... [2] (d) The mass is now released. Using ideas about forces, state and explain the initial motion of the mass. …………………………………………………………………………………………………........ …………………………………………………………………………………………………........ …………………………………………………………………………………………………........ …………………………………………………………………………………………………........ …………………………………………………………………………………………………........ …………………………………………………………………………………………………... [3] Fig. 3.1 0.60 kg mass

5 Anglican High School 2023_S4_Prelim_Phy_P2 [Turn over 4 Fig. 4.1 shows a hand-operated hydraulic press. A force is applied downward s at X as shown. When piston H moves downwards, valve Z closes and valve Y opens. Oil is forced through to raise piston J in the slave cylinder. (a) Piston H exerts a force of 350 N on the oil. (i) State what is meant by pressure. ................................................................................................................................... [1] (ii) Calculate the force exerted by the oil on piston J. force = …………………. [2] (b) State the property of liquids that allows hydraulic systems to operate effectively. ........................................................................................................................................ [1] (c) Piston H moves down 5.0 cm. Calculate the distance that piston J rises by. distance = …………………. [2] Fig. 4.1 force piston J area 600 cm2 load X piston H area 25 cm2 atmospheric pressure slave cylinder master cylinder valve Y valve Z oil reservoir oil tap (usually closed) pivot

6 Anglican High School 2023_S4_Prelim_Phy_P2 [Turn over 5(a) Fig. 5.1 shows a very large plane mirror, inclined at 45° to the horizontal, beneath a painting on the high ceiling of a hall. The mirror is set on a stand at eye-level immediately below the centre C of the painting. This arrangement allows a person to see the painting on the ceiling at eye-level. R and S are two rays of light from C that strike the