Question

Why does lubrication help reduce sliding friction?

• A. Reducing direct contact between the surfaces in contact
• B. Lubrication turns sliding friction into static friction
• C. It does not change the friction
• D. It actually increases sliding friction

Answer 1

The correct option is A Reducing direct contact between the surfaces in contact

When lubricant is applied between the two surfaces in contact, a thin layer is formed there and moving surfaces do not directly rub against each other. Interlocking of irregularities is avoided to a great extent and movement becomes smooth.
Thus, lubrication reduces the direct contact between the surfaces in contact to a great extent.