Question detail
How does lubrication affect 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. It has no effect on efficiency
- B. It increases the amount of energy wasted
- C. It improves efficiency by reducing friction
- D. It decreases the useful energy output
Answer
It improves efficiency by reducing friction
Explanation
The correct option is "It improves efficiency by reducing friction". It improves efficiency by reducing friction is right because it directly matches Energy transfers in a system: Explain how lubrication reduces unwanted energy transfers by reducing friction.. 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 Lubrication
Students often think lubrication eliminates friction completely.
Explain that lubrication reduces friction but does not eliminate it entirely.
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