JAMB - Physics (1985 - No. 4)
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 center 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
i and ii
i, ii and iii
ii, ii and iv
i, ii and v
iii, iv and iv
Explanation
Diving board (i): When a diver jumps on a diving board, the board bends and then oscillates up and down.
Balance wheel of a wrist watch (ii): This component oscillates back and forth in a regular, repeating motion. It is a classic example of harmonic oscillation.
Needle of a D.C. ammeter with A.C. current (v): The needle moves back and forth in response to the alternating current, making it an oscillatory motion.
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