In which of the following scenarios is INCREASING friction desirable?

In which of the following scenarios is INCREASING friction desirable?
  1. Applying grease to door hinges
  2. Sprinkling talcum powder on a carrom board
  3. Applying chalk powder to a weightlifter's hands
  4. Pouring oil between moving engine parts

Solution

Weightlifters use chalk to absorb sweat and increase friction for a secure grip, whereas grease, powder, and oil are used to reduce friction.

Asked in: Homi Bhabha Practice

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