TYPES OF :MOTION
Generally the motion is of three types, translatory motion, rotatory motion and vibratory motion.
1) Translatory Motion:
When a body changes its position as a whole, is called its translatory motion. The line or path of
motion could be straight or curved.
Examples:
Motion of a horse or motion of a ball, moving car, falling bodies, rowing boats, flying birds are
examples of translatory motion. translatory motion may be of the following types.
a) Linear Motion:
If a body moves along a straight line, its motion is called linear motion. e.g motion of free falling bodies.
b) Circular Motion:
If a body moves in a circle its motion is called circular motion. e.g whirling of a stone attached to a string.
c) Random Motion:
If a body moves in an irregular manner, its motion is called random motion. e.g the flight of butterfly or motion of gas molecules.
2) Rotatory / Circular Motion:
When a body rotates as a whole around a fixed axis, is called its rotatory motion. In fact, the particles of the body move in circle. OR The motion of a body in a circular path is called rotatory/circular motion.
Examples:
Motion of wheel of a cycle, the hands of a clock, the wings of a turning fan and motion of the
earth around its axis are examples of rotatory motion.
3) Vibratory Motion:
The to and fro motion of an object about its mean position, repeated at regular intervals of a time is called vibratory or oscillatory motion.
Examples:
Vibration of a pendulum, the oscillation of a mass attached to an elastic spring, motion of swing
and the vibration of a plucked violin string.
NOTE:
The motion of a body can be translatory, rotatory, vibratory or any combination of the three at the
same tine. e.g The motion of a cricket ball can have translatory as well as spin ( rotatory) motion.
The atoms/ molecules of gas can vibrate, rotate on its axis and at the same time can move freely
in its container.
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