CAT HIGH 2025 PHY PRELIM P2 QP

Name: Index Number: Class: CATHOLIC HIGH SCHOOL Preliminary Examination Secondary 4 (O-Level Programme) PHYSICS 6091/02 Paper 2 Structured and Free Response 29 August 2025 1 hour 45 minutes Candidates answer on the Question Paper. No Additional Materials are required. READ THESE INSTRUCTIONS FIRST Write your name, index number and class on all the work you hand in. Write in dark blue or black link. You may use a HB pencil for any diagrams or graphs. Do not use staples, paper clips, glue or correction fluid. Section A Answer all questions. Write your answers in the spaces provided. Section B Answer one question. Write your answers in the spaces provided. Candidates are reminded that all quantitative answers should include appropriate units. The use of an approved scientific calculator is expected, where appropriate. 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. The number of marks is given in brackets [ ] at the end of each question or part question. For examiner’s use only: Section A / 70 Section B / 10 Total / 80 Overall Marks % Paper 1 40 30% Paper 2A 70 50% Paper 2B 10 Paper 3 40 20% This document consists of 22 printed pages. 70  s.f.  formula Paper 2A

2 Section A Answer all the questions in this section. 1 A ball is released from rest above the ground. Fig. 1.1 shows the variation with time of the velocity of the ball. Fig. 1.1 (a) (i) State the gradient of the graph (with units) from t = 0 s to the time of the ball’s first impact with the ground. [1] (ii) Describe the motion of the ball from t = 0 s to the time the ball reaches its maximum height after its first impact with the ground. [2] (iii) Explain why areas X and Y are equal. [1]

3 (b) The ball is subsequently released from rest the same distance above the ground, but with significant air resistance. The ball does not reach its terminal velocity during its motion. (i) Sketch, on Fig. 1.1, the variation of the velocity of the ball with time from t = 0 s to the time of the ball’s first impact with the ground. [1] (ii) Explain, in terms of forces acting, why the velocity of the ball varies as sketched in (b)(i). [2]

4 2 Fig. 2.1 shows the position of a person’s teeth (comprising incisors and molars), and his masseter muscle used to move the lower jawbone. Fig. 2.1 Fig. 2.2 shows a simplified model of the lower jawbone of negligible mass. The model consists of two straight parts of length 7.0 cm and 4.0 cm, making an angle of 50° to each other. During one particular bite of a piece of food, a downward force of 45 N is applied on the incisors at the front of the lower jaw