YIJC 2024 JC2 PRELIM H1 Phy P2 QP

©YIJC 8867/02/YIJC/PRELIM/2024 [Turn over YISHUN INNOVA JUNIOR COLLEGE JC 2 PRELIMINARY EXAMINATION Higher 1 CANDIDATE NAME CG INDEX NO PHYSICS Paper 2 Structured Questions Candidates answer on the Question Paper. No Additional Materials are required. 8867/02 9 September 2024 2 hours READ THESE INSTRUCTIONS FIRST This document consists of 25 printed pages and 3 blank pages For Examiner’s Use Paper 2 Section A 1 / 8 2 / 10 3 / 10 4 /5 5 /10 6 /17 Section B 7 /20 8 /20 Penalty Paper 2 Total /80 Write your name and class in the spaces at the top of this page. 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, highlighters, glue or correction fluid/tape. The use of an approved scientific calculator is expected, where appropriate. Section A Answer all questions. Section B Answer any one question only. 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.

2 ©YIJC 8867/02/YIJC/PRELIM/2024 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 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 + 2 1at2 v2 = u2 + 2as resistors in series R = R1 + R2 +………. resistors in parallel R 1 ........11 21  RR =

3 ©YIJC 8867/02/YIJC/PRELIM/2024 [Turn over BLANK PAGE

4 ©YIJC 8867/02/YIJC/PRELIM/2024 Section A Answer all questions in the spaces provided. 1 (a) Under certain conditions, the distance s moved in a straight line by an object in time t is given by 21= 2s at where a is the acceleration of the object. State two conditions under which the above expression applies to the motion of the object. 1 ….…………………………………………………………………………………………………… 2 ……………………………………………………… …. …………………….………………… . [2] (b) The variation with time t of the velocity v of a car that is moving in a straight line is shown in Fig. 1.1. Fig. 1.1 (i) Compare, qualitatively, the acceleration of the car at time t = 8.0 s and at time t = 14.0 s in terms of magnitude, and …………………………………………………………………………………………………. ……………………………………………………………………………………………… [1] direction. …………………………………………………………………………………………………. ……………………………………………………………………………………………… [1]

5 ©YIJC 8867/02/YIJC/PRELIM/2024 [Turn over (ii) Determine the magnitude of the average acceleration of the car between time t = 0 to t =16.0 s. acceleration = ................................ m s–2 [2] (iii) The car is at point X at time t = 0 s. Determine the magnitude of the displacement of the car from X at time t = 12.0 s. displacement = ..................................... m [2] [Total: 8]

6 ©YIJC 8867/02/YIJC/PRELIM/2024 2 (a) State the principle of conservation of momentum. ………………………………………………………………………………………………………… ………………………………………………………………………………………………………… …………………...………………………………………………………………………………… [1] (b) Two metal blocks A and B move along a horizontal frictionless surface to the right, as shown in Fig. 2.1. Fig. 2.1 Block A is 100 g and moves to the right with a velocity of 2.0 m s−1. Block B is 200 g and initially at rest. After block A collides with the block B, block B moves off with a velocity of 1.3 m s−1 to the right. (i) Determine the magnitude and direction of the velocity v of block A after the collision. magnitude of v = ……………………… m s −1 direction of v = ……………………… …. [3] 2.0 m s−1 0 m s−1 block B 200 g block A 100 g Frictionless surface

7 ©YIJC 8867/02/YIJC/PRELIM/2024 [Turn over (ii) By showing appropriate calculations, explain whether the collision is elastic or inelastic. ……………………………………………….…………………………………………………. ……………………………………………….…………………………………………………. ………………………………………………………………………………………………. [3] (c) By using the relevant Newton’s laws of motion, state and explain the relationship between the rate of change of momentum of one block and that of the other block. ……………………………………………………………………………………………………........ ……………………………………………………………………………………………………........ ……………………………………………………………………………………………………........ ……………………………………………………………………………………………………........ …………...………………………………………………………………………………………… [3] [Total: 10]

8 ©YIJC 8867/02/YIJC/PRELIM/2024 3 A 60 cm wide wall mounted tabletop is attached to a wall at hinge A as shown in Fig. 3.1. The uniform tabletop weighs 130 N. Fig. 3.1 It is supported by a light metal wire that is attached to the table at B. The hinge exerts a force F at an angle θ above the horizontal tabletop. (a) (i) State the conditions necessary for the tabletop to be in equilibrium. ………………………………………………………………………………………………..… ……………………………………………………………………………………………..…… …………………………………………………………………………………………..…... [2] (ii) Hence, explain why the hinge at A cannot only exert a horizontal normal contact force. ……………………………………………………………………………………..….………... ……………………………… .……………………………………………….…………..…….. …………………………………………………………………………….…………..…….. [2] (b) (i) Calculate the tension in the wire. tension = …………………. N [2] tabletop hinge wall B wire 60 cm C 20˚ A θ F

9 ©YIJC 8867/02/YIJC/PRELIM/2024 [Turn over (ii) Hence, determine the magnitude of the force F and the angle θ. F = ……………………… N θ = …………………… ˚ [4] [Total: 10]

10 ©YIJC 8867/02/YIJC/PRELIM/2024 4 Fig. 4.1 shows a light inextensible rope that passes over a light smooth pulley with a system of two blocks having the same dimension with masses 4.0 kg and 2.0 kg are attached to its two ends. The two blocks are initially at rest with the 4.0 kg block held 20.0 cm above the 2.0 kg block. Fig. 4.1 (a) After the 4.0 kg block is released, the system of blocks begins to move. Based on the principle of conservation of energy, describe the energy conversion happening for the system of blocks. ………………………………………………………………………………………………………... …………………………………………………………………….………………………………. [1] (b) The blocks are allowed to move until they are at the same height above the ground. (i) State the distance travelled down by the 4.0 kg block. distance = …………………………… m [1] (ii) Hence, determine the speed of the blocks when they are at the same height above the ground. speed of the blocks = …………………. m s −1 [3] [Total: 5] rope 2.0 kg block ground 20.0 cm 4.0 kg block pulley