An engineer is studying the energy efficiency of a heavy steel flywheel spinning on a central shaft inside a vacuum chamber. Over time, some kinetic energy is transferred to the thermal energy store of the bearings and the supporting frame.
Explain one modification to the system that could reduce this unwanted energy transfer.
82 exam-style questions on Edexcel GCSE Physics 3.1 Energy stores and calculations. Each one has a worked solution and a mark scheme showing where the marks go.