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Unilorin Post-UTME Physics 2021 (Model questions) Question 4

Question 4

Friction

Which of the following statements about solid friction are correct? It I. is a force. II. occurs between the surfaces of two bodies in contact. III depends on the area of contact.

  1. A.I and II only
  2. B.I and III only
  3. C.II and III only
  4. D.II and III
Show the answer and explanation

Answer: A (I and II only)

Explanation

Friction is a force acting between surfaces in contact, but solid friction does not depend on the area of contact.