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ASVAB · General

Which of the following statements about friction is correct?

Correct answer

Friction converts kinetic energy to heat

  1. A Friction always increases speed
  2. B Friction converts kinetic energy to heat
  3. C Friction only occurs between liquids
  4. D Friction is eliminated by rough surfaces

Why this is the answer

Friction converts kinetic energy (motion energy) to thermal energy (heat). When you rub your hands together, friction converts motion to warmth. Friction opposes relative motion between surfaces in contact.
Source: ASVAB MC, Friction

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