A toy train powered by an onboard battery is run along a flat, horizontal track. During its journey, the train speeds up and slows down several times, and its electric motor becomes warm.
Which of the following energy stores associated with the train does not change during the journey?
the chemical energy of the battery
the gravitational potential energy of the train
the internal (thermal) energy of the motor
the kinetic energy of the train
533 exam-style questions on CIE IGCSE Physics 1.7 Energy, work and power, covering 1.7.1a Energy stores and energy transfers, 1.7.1b Conservation of energy, 1.7.1c Kinetic and gravitational potential energy, 1.7.2 Work done, 1.7.3 Energy resources, 1.7.3a Energy resources and electricity generation, 1.7.3b Nuclear fusion as an energy source, 1.7.3c Efficiency of energy transfer, and 1.7.4 Power. Each one has a worked solution and a mark scheme showing where the marks go.