Physics
Grade-9
Easy

Question

If the irregularities of the surfaces shown in the figure decreases, the friction will _____.

  1. Increase
  2. Decrease
  3. Remains same
  4. Will not be affected

hintHint:

  • 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.

The correct answer is: Decrease


    • Rough Materials: It has an irregular and uneven surface with bumps or ridges and is not smooth to touch.
    • Smooth Materials: It has an even or a flat surface free from irregularities, roughness or bumps and is smooth to touch
    • 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.
    • So on decreasing irregularities roughness decreases hence the friction will Decrease

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