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JAMB Physics 1978 Question 2

Question 2

Friction

The frictional force between two bodies

  1. A.exists only when there is relative motion or tendency for motion
  2. B.acts so as to oppose the motion
  3. C.depends on the normal reaction between the two surfaces
  4. D.is relatively independent of the area in contact
  5. E.has all of these characteristics.
Show the answer and explanation

Answer: E (has all of these characteristics.)

Explanation

Friction appears only when there is motion or a tendency to move, it opposes that motion, it is proportional to the normal reaction and it hardly depends on the area of contact. All four statements are true.