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.
Related questions
The drag force on an object moving through a fluid depends on:Which of the following helps INCREASE friction deliberately?Why does the jar of a kitchen mixer become hot after running for a few minutes?Two boxes A and B have the same weight and the same surface in contact with the floor. BoxBall bearings are used in the wheel axles of bicycles and in motors.
 is caEven surfaces that look perfectly smooth — like glass or polished steel — have a large num