AQA_2024: A-level Physics - Paper 3 Section B Engineering Physics. (Merged Question Paper and Marking Scheme)

AQA_2024: A-level Physics - Paper 3 Section B Engineering Physics. (Merged Question Paper and Marking Scheme) Please write clearly in block capitals. Centre number Surname Forename(s) Candidate signatu ure Candidate number I declare this is my own work. A-level PHYSICS Paper 3 Section B Engineering physics Monday 17 June 2024 Materials For this paper you must have:  a pencil and a ruler  a scientific calculator  a Data and Formulae Booklet  a protractor. Instructions Morning Time allowed: The total time for both sections of this paper is 2 hours. You are advised to spend approximately 50 minutes on this section. For Examiner’s Use Question  Use black ink or black ball-point pen.  Fill in the boxes at the top of this page.  Answer all questions.  You must answer the questions in the spaces provided. Do not write outside the box around each page or on blank pages. Mark 1 2 3 4  If you need extra space for your answer(s), use the lined pages at the end of this book. Write the question number against your answer(s). IB/M/Jun24/E6 TOTAL  Do all rough work in this book. Cross through any work you do not want to be marked.  Show all your working. Information  The marks for questions are shown in brackets.  The maximum mark for this paper is 35.  You are expected to use a scientific calculator where appropriate.  A Data and Formulae Booklet is provided as a loose insert. 7408/3BC For A-Level Physics Paper 3 Section B: Engineering Physics, focus on the following key areas: 1. Mechanical Engineering:  Forces and Motion: Understand the application of Newton's laws in engineering, particularly for static and dynamic systems. Study forces in structures, including tension, compression, and torsion.  Stress and Strain: Learn about stress (force per unit area) and strain (deformation relative to original dimensions). Study Young's modulus for materials and understand how to calculate elastic limit, yield point, and ultimate tensile strength.  Simple Harmonic Motion (SHM): Study the principles of SHM and its application in engineering systems like springs and pendulums. Be able to solve problems related to oscillations and calculate parameters such as amplitude, frequency, and period. 2. Thermodynamics:  First and Second Laws of Thermodynamics: Understand heat engines, efficiency, and the Carnot cycle. Study how the first law relates to energy conservation in mechanical systems and the second law to entropy and energy dispersal.  Heat Transfer: Learn about different methods of heat transfer, including conduction, convection, and radiation. Understand how these mechanisms are used in engineering applications, such as in engines, heat exchangers, and refrigeration.  Specific Heat Capacity: Be able to calculate the energy required to change the temperature of materials and understand how this is used in the design of heating and cooling systems. 3. Fluid Mechanics:  Fluid Statics and Dynamics: Study pressure, density, and Archimedes' principle in fluid systems. Understand Pascal’s principle and its application in hydraulic systems (e.g., hydraulic presses).  Bernoulli’s Principle: Understand how fluid velocity and pressure are related, and how Bernoulli’s principle is used in the design of systems such as aircraft wings, pipes, and venturi tubes.  Flow Rate and Continuity Equation: Learn how the continuity equation applies to fluid flow in pipes and how flow rate is conserved. 2 Do not write outside the IB/M/Jun24/7408/3BC There are no questions printed on this page DO NOT WRITE ON THIS PAGE ANSWER IN THE SPACES PROVIDED box 3 Do not write outside the IB/M/Jun24/7408/3BC Section B Answer all questions in this section. box 0 1 A heavy turntable is mounted on a fixed base. The turntable can rotate freely on a low-friction bearing. 0 1 . 1 Figure 1 shows a propeller unit fixed to the centre of the turntable. The propeller unit consists of a motor-driven propeller and a battery. The propeller and the turntable have a common axis of rotation. Figure 1 At first, the turntable and the propeller are at rest. The propeller motor is switched on and the propeller quickly reaches a high final angular speed. The propeller rotates clockwise when viewed from above. Compare, with reference to angular momentum, the motions of the turntable and the propeller. [3 marks] Question 1 continues on the next page Turn over ► 4 Do not write outside the box IB/M/Jun24/7408/3BC turntable. Figure 2 A small steel mass is held by an electromagnet above the top surface of the turntable. The diameter of the turntable is about half a metre. The turntable rotates freely at an initial angular speed ω1. The switch is opened so that the mass falls and sticks to the surface of the turntable. This changes the angular speed of the turntable to ω2. The steel mass can be considered to be a point mass. Describe how to determine the moment of inertia of the turntable using observations of ω1 and ω2. In your answer you should:  suggest how ω1 and ω2 are measured  state any other measurements needed and name the equipment used to make them  explain how the moment of inertia of the turntable is determined from the measurements. [6 marks] 0 1 . 2 Figure 2 shows an arrangement used to determine the moment of inertia of the 5 Do not write outside the box IB/M/Jun24/7408/3BC Turn over ► 9 6 Do not write outside the box There are no questions printed on this page IB/M/Jun24/7408/3BC DO NOT WRITE ON