MCQ
$X$ is a physical quantity that decreases with the use of any lubricants between two surfaces. What does $X$ represent?
- ATemperature
- BPressure
- ✓Friction
- DDensity
✓
Answer
Correct option: C.
Friction
Lubricants are thick liquids that make rough surfaces smooth and slippery. The application of lubricants reduces the friction between two surfaces moving relative to each other. Since the use of lubricants between two surfaces reduces the value of $X, X$ must be the force of friction.
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