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1.2 Conservation and dissipation of energy

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Question 20
H

A student says that a machine can be made 100 % efficient. Why is this not possible for a machine that has moving parts?

[1]
A

some of the input energy is always destroyed by the moving parts

B

some energy is always dissipated by friction between moving parts

C

the useful output energy is always greater than the input energy

D

the input energy is always stored in the moving parts of the machine

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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