Question

6. An oscillatory motion is always periodic, but a periodic motion is not always oscillatory' Explain
the statement with an example,​

Answer 1

Answer:Oscillatory motion means to and fro motion or back and forth motion.

For example motion of a pendulum etc.

Periodic motion is the motion that repeats itself after a fixed interval of time.

Now, oscillatory motions always repeat after certain interval of time, thus they are periodic motion are not oscillatory. Like motion of planets around sun is periodic as because it repeats itself after sometime but can't be said to perform to and fro motion so they are not oscillatory motion.

Explanation:

Answer 2

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.]