Physics 7408/3BC June 2020

The AQA A-level Physics Paper 3B (November 2020), Option C (Engineering Physics), explores principles of rotational dynamics, thermodynamics, and engine efficiency. Key areas include moment of inertia, angular momentum conservation, and frictional torque analysis in clutches. Questions test calculations of common angular velocity, analysis of thermal and mechanical efficiencies in petrol engines, and isothermal gas compression. Students investigate real-world applications such as geothermal power systems and the limitations of heat engines dictated by the second law of thermodynamics. Keywords: AQA Physics, engineering physics, moment of inertia, angular momentum, engine efficiency, thermodynamics, geothermal energy.