(1) periodic motion (2) oscillatory motion. Give two examples.

1.	(1) periodic motion (2) oscillatory motion. Give two examples.
Answer» (1) Periodic motion : A motion that repeats itself at definite intervals of time is said to be a periodic motion. Examples : The motion of the hands of a clock, the motion of the Earth around the Sun. (2) Oscillatory motion : A periodic motion in which a body moves back and forth over the same path, straight or curved, between alternate extremes is said to be an oscillatory motion. Examples : The motion of a taut string when plucked, the vibrations of the atoms in a molecule, the oscillations of a simple pendulum. [Note : The oscillatory motion of a particle is also called a harmonic motion when its position, velocity and acceleration can be expressed in terms of a periodic, sinusoidal functions-sine or cosine, of time.

Answer»

(1) Periodic motion : A motion that repeats itself at definite intervals of time is said to be a periodic motion.

Examples : The motion of the hands of a clock, the motion of the Earth around the Sun.

(2) Oscillatory motion : A periodic motion in which a body moves back and forth over the same path, straight or curved, between alternate extremes is said to be an oscillatory motion.

Examples : The motion of a taut string when plucked, the vibrations of the atoms in a molecule, the oscillations of a simple pendulum.

[Note : The oscillatory motion of a particle is also called a harmonic motion when its position, velocity and acceleration can be expressed in terms of a periodic, sinusoidal functions-sine or cosine, of time.

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