Striking a matchstick against a matchbox to light it : Useful friction :: Wear and tear of bicycle chain…

Striking a matchstick against a matchbox to light it : Useful friction :: Wear and tear of bicycle chain links : ___?
  1. Useful friction
  2. Harmful/Undesirable friction
  3. Non-contact force
  4. Effect of gravity

Solution

Lighting a matchstick relies on friction productively, while wear and tear in machinery is an undesirable effect of friction.

Asked in: Homi Bhabha Practice

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