Question detail
How does lubrication improve the efficiency of a machine?
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. By increasing friction
- B. By reducing friction
- C. By creating more heat
- D. By adding mass to the machine
Answer
By reducing friction
Explanation
The correct option is "By reducing friction". By reducing friction is right because it directly matches Efficiency: (HT only) Explain how reducing unwanted energy transfers improves efficiency.. 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 Improvement
Students often think that reducing unwanted energy transfers means eliminating all energy loss, which is impossible in real systems.
Clarify that while energy losses can be minimized, no system can be perfectly efficient due to inherent energy dissipation.
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