Which of the following is a way to REDUCE friction?
ARoughening the surface
BRemoving wheels
CPouring oil or grease between moving parts
DIncreasing the weight on the surface
Answer & Solution
Correct answer: C. Pouring oil or grease between moving parts
Oil, grease and graphite (called lubricants) form a thin layer between two surfaces, separating them and reducing the interlocking of irregularities. This reduces friction and is why machines run smoother when lubricated.
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