Question

Two examples for oscillatory motion

Answer 1

Double pendulum.

Foucault pendulum.

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.]