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Friction — Science STD 8 — Question

Gujarat BoardEnglish MediumSTD 8ScienceFriction1 Mark
MCQ
Which of the following actions does not increase friction?
  • A
    Threading tires.
  • B
    Grinding on stones.
  • C
    Making spikes on shoes.
  • ✓
    Powdering a carom board.
✓

Answer

Correct option: D.
Powdering a carom board.
The friction of a surface is increased by increasing its roughness. The roughness of a carom board does not increase when it is powdered. Hence, the friction of a carom board surface does not increase when it is powdered.

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