Question detail
How can 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 the machine's weight
- B. By reducing the amount of energy input needed
- C. By decreasing the friction between moving parts
- D. By increasing the temperature of the machine
Answer
By decreasing the friction between moving parts
Explanation
The correct option is "By decreasing the friction between moving parts". By decreasing the friction between moving parts is right because it directly matches Efficiency: (HT only) Describe ways to increase the efficiency of an intended energy transfer.. 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 Improvements
Students often think that increasing the input energy will always increase the efficiency of a system.
Emphasize that efficiency is about maximizing useful energy output relative to total energy input, and that reducing wasted energy is key to improving efficiency.
Related flashcards
Flashcard 1 of 5
Related practice questions
Question 1 of 5
Choose an answer, get feedback, then move sideways through the set.