Physics
Grade-9
Easy

Question

A lubricant _____.

  1. Reduces friction
  2. Increases friction
  3. Both a and b
  4. None of the above

hintHint:

When lubricant is applied between the moving parts of a machine, a thin layer is formed there and moving surfaces do not directly rub against each other

The correct answer is: Reduces friction


    •  Friction is a type of contact force.
    • A rough surface will have more friction because on the rough surface there will be more irregularities. They will cause interlocking which in turn creates more frictional force. For a smooth surface, irregularities and interlocking is less and hence has very less friction.
    • When lubricant is applied between the moving parts of a machine, 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 friction is reduced.

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