Multiple choice

Why is friction reduced on polishing the surface of a wooden table?

  1. Because of the decrease in the irregularities on the polished surface

  2. Because of the shiny coating on the surface

  3. Because of the increase in irregularities on the polished surface

  4. Both (2) and (3)

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A Correct answer
Explanation

Friction is caused by the irregularities on the two surfaces in contact. On polishing the surface of a wooden table, it becomes smooth and irregularities on its surface decrease. As a result, the friction is reduced.

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