Question detail
What is a common reason for energy dissipation in machines?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Conservation and dissipation of energy
Question
- A. Friction between moving parts
- B. Excessive lubrication
- C. High thermal conductivity
- D. Perfect insulation
Answer
Friction between moving parts
Explanation
The correct option is "Friction between moving parts". Friction between moving parts is right because it directly matches Efficiency: Explain why no real energy transfer is perfectly efficient.. The other options are less suitable because they change the required Physics relationship, confuse the relevant energy store or use a distractor that does not answer the question.
Common mistake
Misunderstanding Efficiency
Students often believe that energy transfers can be perfectly efficient in real-world scenarios.
Emphasize that all real energy transfers involve some energy dissipation, making perfect efficiency impossible.
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