Question

Explain how does lubrication reduces friction?

Answer 1

By eliminating solid-solid sliding contact. A solid is defined as a material that can support shear (lateral force). When two solids come into contact, imperfections in the surface interfer with each other and resist slide by their shear strength. Liquids or micoscopic balls of graphite (dry lubricant) flow or roll to reduce shear forces the result in friction.

Answer 2

Explanation:

1. The substances which reduce friction are called lubricants.
2. When oil, grease or any other lubricants are applied between the moving parts of a machine, a thin layer is found between the moving surfaces and hence, they don't directly rub against each other.
3. Interlocking of irregularities is avoided to a great extent by the application of lubricants.
4. Hence, movement becomes smooth.

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