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Laws of Motion
Question
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Why are lubricants used in machines?

Answer

Lubricants are used in machines because they  fill the depressions present in the surface of contact and also change the sliding friction into fluid friction. Hence the friction is reduced. 

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Some More Questions From Laws of Motion Chapter

Due to what type of inertia, the spark leaves the grind stone tangentially while sharpening the knife?

Which law of motion is also called law of inertia?

What is measure of inertia of body?

Which law of motion defines the force?

What happens to a stone tied to the end of string and whirled in a circle if the string suddenly breaks?

Which law of motion gives the quantitative knowledge of force?

Which law of motion is the real law of motion?

Which law of motion gives the quantitative definition of force?

Why do we pull the rope in downward direction for climbing up?

What can set the body at rest into motion?