2024 VJC H1 Prelim P2

VICTORIA JUNIOR COLLEGE 2024 JC2 PRELIMINARY EXAMINATION Higher 1 Name : __________________________ CT group : ________________ PHYSICS Paper 2 Structured Questions Candidates answer on the Question Paper. No Additional Materials are required. 8867/02 17 September 2024 TUESDAY 8 am to 10 am (2 hours) READ THESE INSTRUCTIONS FIRST Write your name and Civics Group on all the work you hand in. Write in dark blue or black pen on both sides of the paper. You may use an HB pencil for any diagrams or graphs. Do not use staples, paper clips, glue or correction fluid. DO NOT WRITE ON ANY BARCODES. The use of an approved scientific calculator is expected, where appropriate. Section A Answer all questions. Section B Answer any one question. At the end of the examination, fasten all your work securely together. The number of marks is given in brackets [ ] at the end of each question or part question. For Examiner’s use Question Mark Section A 1 2 3 4 5 6 Section B 7 8 g Units sf Total / 80 This document consists of 23 printed pages and 1 blank page

2 Data speed of light in free space c = 3.00  108 m s-1 elementary charge e = 1.60  10-19 C unified atomic mass constant u = 1.66  10-27 kg rest mass of electron me = 9.11  10-31 kg rest mass of proton mp = 1.67  10-27 kg the Avogadro’s constant NA = 6.02 × 1023 mol-1 gravitational constant G = 6.67 × 10-11 N m2 kg-2 acceleration of free fall g = 9.81 m s-2 Formulae uniformly accelerated motion s = ut +( ½) at2 v2 = u2 + 2as resistors in series R = R1 + R2 + … resistors in parallel 1/R = 1/R1 + 1/R2+ …

3 Section A Answer ALL questions from this section 1. A sphere is projected horizontally. The sphere is photographed onto the same film negative at intervals of 0.10 0 s with an uncertainty of 0.001 s. The 7 images of the sphere are shown against a grid in Fig. 1.1. The actual uncertainty for the distances measured is 0.1 cm. Air resistance is negligible. Fig. 1.1 (a) Use Fig.1.1 to determine the acceleration g of the sphere. [2] g = …………………………. Horizontal distance/ m Vertical distance/ m

4 (b) Explain how your choice of the data point from Fig 1.1 helps to improve the reliability of your calculation in (a). [1] ………………………………………………………………………………………………… ………………………………………………………………………………………………… (c) Use your answer in (a) to determine the actual uncertainty in the value of g. Hence give a statement of g, with its uncertainty, to an appropriate number of significant figures. [4] g = …………….  …………………. (d) Using existing data, explain how you can improve the accuracy of g obtained by plotting a different graph. Explain why this new method is more accurate. [2] ………………………………………………………………………………………………… ………………………………………………………………………………………………… ………………………………………………………………………………………………… …………………………………………………………………………………………………

5 2(a) Student A claims, “When a ball hits and rebounds off a wall, there is impulse on the ball, but not on the wall because the wall does not move.” Discuss whether Student A is correct. [2] ………………………………………………………………………………………………… ………………………………………………………………………………………………… (b) A ball B of mass 1.2 kg travelling at constant velocity collides head-on with a stationary ball S of mass 3.6 kg, as shown in Fig. 2.1. Frictional forces are negligible. The variation with time t of the velocity v of ball B before, during and after colliding with ball S is shown in Fig. 2.2. Fig. 2.1 Fig. 2.2 ball B ball S

6 (i) Using Fig. 2.2, explain whether momentum is conserved in this collision. [3] (ii) Determine quantitatively whether the collision is elastic or inelastic. [2]

7 3(a) State what is meant by the electric field strength at a point [1] ………………………………………………………………………………………………… ………………………………………………………………………………………………… (b) A potential difference is applied between two horizontal plates, each 1.0 m long and separated by 2.5 cm. A beam of -particles enters the field horizontally mid-way between the plates at a speed of 1.5 x 107 m s-1. The electric field strength between the two plates is 7.5 x 104 N C-1 as shown in Fig. 3.1 which is not drawn to scale. (i) Calculate the force on each α-particle due to the electric field. [2] Force = ……………………… (ii) Determine the time that each α-particle spends inside the field. [1] Time = …………………………….. + V – V Fig. 3.1 1.0 m 2.5 cm Beam of α- particles 1.5 x 107 m s-1

8 (iii) Show that the α-particles will not hit the plates. [2] (iv) Sketch on Fig 3.1, the path of the α-particles between and beyond the plates. [1]

9 4(a) Define magnetic flux density. [2] ………………………………………………………………………………………………… ………………………………………………………………………………………………… ………………………………………………………………………………………………… (b) Electrons are moving in a vacuum with speed 1.7 x 107 m s-1. The electrons enter a uniform magnetic field of flux density 4.8 mT. The figure below shows the path of the electrons. Fig 4.1 The path of the electrons remains in the plane of the page. (i) State the direction of the magnetic flux density. [1] …………………………………………………………………………………………………

10 (ii) Calculate the magnitude of the force exerted on each electron by the magnetic field. [2] Magnitude of the force = ………………………. (iii) Use the information in (ii) to calculate the distance d between the path of the electrons entering the magnetic field and the path of the electrons leaving the magnetic field. [3] d = …………………………