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1.2 Conservation and dissipation of energy

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Question 16
H

A machine is redesigned so that less energy is dissipated when it runs. Which pair of changes will reduce the energy dissipated by the machine?

[1]
A

using lighter moving parts and running the machine at a higher speed

B

adding insulation round the machine and using rougher moving surfaces

C

lubricating the moving parts and using smoother surfaces where they touch

D

lubricating the moving parts and running the machine at a much higher speed

Markscheme

1.2 Conservation and dissipation of energy Questions

  1. GCSE
  2. /Physics
  3. /1.2 Conservation and dissipation of energy

40 exam-style questions on AQA GCSE Physics 1.2 Conservation and dissipation of energy, covering 1.2.1 Energy transfers in a system and 1.2.2 Efficiency. Each one has a worked solution and a mark scheme showing where the marks go.

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