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1.2 Conservation and dissipation of energy

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Question 23
H

The moving parts of a machine are lubricated with oil. The total input energy transfer to the machine stays the same. What happens to the useful output energy transfer and to the efficiency?

[1]
A

the useful output energy transfer increases and the efficiency increases

B

the useful output energy transfer increases and the efficiency is unchanged

C

the useful output energy transfer is unchanged and the efficiency increases

D

the useful output energy transfer decreases and the efficiency is unchanged

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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