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Friction between two surfaces in relative motion generates

  • A.wear but no heat
  • B.neither heat nor wear if the load is light
  • C.heat and wear
  • D.heat but no wear

Answer: C

Correct answer: heat and wear

Friction converts mechanical work into heat, and the asperities that resist the motion are progressively torn away, which is wear. Both occur together and both grow with load, so a lubricant that reduces friction reduces both at once. No load is light enough to eliminate either entirely.

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