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JAMB Physics 1985 Question 4

Question 4

Motion

Which of the following types of motion are oscillatory? I. A diving board when used by a diver II. The motion of the balance wheel of a wrist watch III. The motion of the turn-table of a record player IV. The motion of the centre of a ten kobo piece as it rolls down an inclined plane. V. The motion of the needle of a D.C. ammeter into which a low A.C. current is passed

  1. A.I and II only
  2. B.I, II and III
  3. C.II, III and IV
  4. D.I, II and V
  5. E.III, IV and V
Show the answer and explanation

Answer: A (I and II only)

Explanation

A diving board and a watch balance wheel move to and fro about a fixed position. A turntable rotates and a rolling coin moves forward; neither repeats a to-and-fro motion.