Question

When a lubricant is applied between two surfaces, the movement becomes smooth as the interlocking of irregularities is avoided to a great extent.

• A. True
• B. False

Answer 1

The correct option is A True

Concept of friction

1. When two surfaces with irregularities are in contact with each other, a resultant force due to the contact can be seen.
2. This is generally known as friction.
3. Friction can increase or decrease due to the presence of irregularities in the surfaces, as the irregularities result in the interlocking of the surfaces in contact.
4. When a lubricant is applied between the two surfaces, the lubricant forms a new layer between the surfaces with lesser irregularities.
5. As a result, the friction force becomes less, and the movement becomes smoother.

Hence, the statement is true.