2023 VJC Prelim P2 QP

VICTORIA JUNIOR COLLEGE 2023 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 20 September 2023 WEDNESDAY 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 Total / 80 This document consists of 27 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 H1 P2 - Errors and UncertainƟes SSQ 1 John performs an experiment involving a spring. The unextended length of the spring was measured to be x1 = 10.0  0.1 cm. When a load was placed at the bottom of the vertically suspended spring, it extended to x2 = 20.0  0.1 cm. The spring constant k is known to be 20 N m-1 exactly. (a) State Hooke’s Law. …………………………………………………………………………………………… ………………………………………………………………………………………… [1] (b) Determine a value for the force F exerted on the spring together with its associated uncertainty. F = ( ……………...  ……………. ) N [4] (c) When extended, the spring possesses elastic potential energy given by 2 2 1 1 ( )2U k x x  Calculate a value for the fractional uncertainty of U. Fractional uncertainty = ……………………. [3] [Total: 8]

4 Forces + WEP (H1 P2 SSQ 1) 2 (a) Two identical massless springs and two identical 200 g masses are connected to one another and suspended from a support as shown in Fig. 2.1. The force constant of each spring is 24.0 N m-1. The lower mass is lowered gently until it comes to rest and the system attains equilibrium. Fig. 2.1 (i) Calculate the extension of the upper and lower springs.