MSHS 2024 6091 Prelim P3 MS

1 Class/ Index Number / Centre Number/ ‘O’ Level Index Number / Name MARIS STELLA HIGH SCHOOL PRELIMINARY EXAMINATION SECONDARY FOUR PHYSICS 6091/03 Paper 3 Practical 20 August 2024 1 hour 50 minutes Candidates answer on the Question Paper. No additional materials are required. READ THESE INSTRUCTIONS FIRST Write your class, index number and name on all the work you hand in. Give details of the practical shift and laboratory, where appropriate, in the boxes provided. Write in dark blue or black pen. You may use an HB pencil for any diagrams or graphs. Do not use staples, paper clips, glue or correction fluid. Answer all questions. All of your answers should be written in this Question Paper: scrap paper must not be used. Graph paper is provided in this Question Paper. Additional sheets of graph paper should be used only if it is necessary to do so. You will be allowed to work with the apparatus for a maximum of 55 minutes for each section. You are expected to record all your observations as soon as they are made. An account of the method of carrying out the experiments is not required. The use of an approved scientific calculator is expected, where appropriate. The number of marks is given in brackets [ ] at the end of each question or part question. The total number of marks for this paper is 40. Examiner’s Use 1 2 3 Total 40 Shift Laboratory This document consists of 14 printed pages inclusive of this cover page.

2 Section A 1 In this experiment you will investigate the indentation made by a glass ball in the surface of some modelling clay. You have been provided with: • a glass ball • two 100 g masses and one 100 g mass hanger • a 30 cm plastic ruler • a set square • a stand, boss, clamp and brick • a wooden strip (metre rule) • a piece of modelling clay • a wooden stand • a loop of string • stopwatch (a) Ensure that the wooden strip is clamped and the clamp is able to rotate freely in the boss. Place the glass ball and the modelling clay between the centre of the wooden strip and the wooden stand as shown in Fig. 1.1. Fig. 1.1 Put the two 100 g masses onto the mass hanger. The combined weight F1 of the mass hanger and both 100 g masses is 3.0 N. Place the mass hanger and masses directly above the glass ball for about one minute. Remove the mass hanger and masses. Raise the wooden strip and remove the ball from the modelling clay. Observe a small circle where the ball has been pressed into the surface of the clay. This is an indentation. (i) Measure and record the diameter d1 of the indentation. d1 = ................................................... [1] 1.1 cm stand clamp glass ball wooden strip modelling clay wooden stand loop of string mass hanger and masses brick bench d1 = 1.1+1.1 2 = 1.1

3 (ii) The area of a circle can be calculated using the equation: 𝐴 = 𝜋𝑑2 4 where A is the area and d is the diameter of the circle. Calculate the area A1 of the indentation with diameter d1. A1 = ................................................. [1] (b) (i) Replace the ball on a different part of the modelling clay under the wooden strip. Lower the strip so that it rests on top of the ball. Using the loop of string, attach the mass hanger and masses near the end of the wooden strip as shown in Fig. 1.2. Ensure that the wooden strip does not touch the bench top when mass is loaded. Measure and record x and y. Fig. 1.2 x = ........................................................... y = ........................................................... [1] 47.0 cm 94.0 cm 𝐴1 = 𝜋(1.1)2 4 = 0.95 cm2 0.95 cm2 (2sf) x y

4 (ii) Calculate the force F2 exerted on the modelling clay using the equation: 𝐹2 = 3𝑦 𝑥 𝐹2 = 3(94.0) (47.0) F2 = 6.0 N F2 = ...................................................... [1] (iii) Measure and record the diameter d2 of the indentation produced by the ball in the clay. Using the equation in (a)(ii), calculate the area A2 of the circle with diameter d2. d2 = ........................................................ A2 = ........................................................ [1] 6.0 N 1.5 cm 𝐴2 = 𝜋(1.5)2 4 = 1.77 cm2 1.77 cm2 (2sf) d2 = 1.5+1.5 2 = 1.5 cm

5 (c) Plan A student claims that F is directly proportional to A. Plan an experiment to find out if the student’s claim is correct. In your plan, you should: • state quantities that you should keep constant • describe how you will perform the experiment • explain one precaution that you should take to ensure the accuracy of the experiments • draw a table, with column headings, to show how to display the range of readings • sketch the graph that you would obtain if the suggested relationship is correct. ………………………………………………………………………………………………………. ………………………………………………………………………………………………………. ………………………………………………………………………………………………………. ………………………………………………………………………………………………………. ………………………………………………………………………………………………………. ………………………………………………………………………………………………………. ………………………………………………………………………………………………………. ………………………………………………………………………………………………………. ………………………………………………………………………………………………………. ………………………………………………………………………………………………………. ………………………………………………………………………………………………………. ………………………………………………………………………………………………………. ………………………………………………………………………………………………………. ………………………………………………………………………………………………………. ………………………………………………………………………………………………………. ………………………………………………………………………………………………………. ………………………………………………………………………………………………………. ………………………………………………………………………………………………………. ………………………………………………………………………………………………………. ………………………………………………………………………………………………………. ………………………………………………………………………………………………………. ………………………………………………………………………………………………………. Defining variables Independent variable: Area of indentation, A Dependent variable: Force exerted on modelling clay, F Control variables: Mass of load and hanger, type of modelling clay used, position the hanger is attached to the wooden strip, dimension of the modelling clay Procedure 1. Setup as shown in Fig 2.2 2. Position the glass ball such that it is below the 50 cm mark of the wooden strip. Measure and record the distance from the clamp to the centre of glass ball, x. 3. Attach the 3.0 N mass hanger and load near to the end of the wooden strip using a loop of string. Keep this position constant throughout the experiment. Measure and record the distance from the clamp to the loop of string, y. 4. To ensure that the glass ball will not sink further into the modelling clay, wait for 1 minute before measuring the diameter of the indentation, d. 5. Calculate the area of the indentation using A = πd2/4. 6. Find the force exerted on modelling clay using F = 3y/x. 7. Repeat steps (3) to (6) five more times by varying the position of the glass ball along the wooden strip. 8. Record the values in a table as shown below, x/cm y/cm d/cm A/cm2 F/N 20.0 30.0 40.0 50.0 60.0 70.0 9. After each set of reading, ensure that the modelling clay is knead back into a rectangular block.

6 ………………………………………………………………………………………………………. ………………………………………………………………………………………………………. ………………………………………………………………………………………………………. ………………………………………………………………………………………………………. ………………………………………………………………………………………………………. ………………………………………………………………………………………………………. ………………………………………………………………………………………………………. ………………………………………………………………………………………………………. ………………………………………………………………………………………………………. ……………………………………………………………………………………………………[5] [Total: 10] Analysis • Plot a graph of F against A. If a straight line through the origin is obtained, th