A locomotive accelerates a train along a level track. A model assumes that the wheel bearings are frictionless. The energy transferred by the driving force is the same in the model and in a test.
The train reaches a lower speed in the test than the model predicts. Explain this difference.
121 exam-style questions on Edexcel GCSE Physics 3.1 Energy stores and calculations, covering 3.1.1 Gravitational potential energy, 3.1.2 Kinetic energy, and 3.1.3 Energy transfers and conservation of energy. Each one has a worked solution and a mark scheme showing where the marks go.