A student investigates the efficiency of a laboratory trolley rolling down a wooden ramp. As the trolley moves down the ramp, some energy is transferred to the thermal energy store of the surroundings.
Explain one way the student 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.