Question

what kind of substances is known as lubricants ? increase or decrease​

Answer 1

Oils, grease, graphite, etc., are examples of lubricants. These form a thin layer between the two surfaces in contact thus avoiding them from scrubbing directly against each other. This makes the movement smooth and reduces friction.

Answer 2

Answer:

Lubricants like oil and grase help in decreasing friction. For eg-We apply oil to the chain of our bags if they got stuck.