(a) Movement of the earth around the sun : Circular and periodic motion.

(b) Movement of a ceiling fan : Oscillatory Circular motion.

(c) A meteor falling from the sky :  linear motion.

(d) A rocket launched from the ground : Non-uniform linear motion.

(e) A fish swimming in water : Random motion.

(f) The plucked string of a sitar : Oscillatory motion

(a) If a ball is released from the terrace of a building, it comes down in non-uniform linear motion. On the other hand, it reaches the ground in non-linear motion if it is thrown with force away from the terrace in a direction parallel to the terrace.

(b) The motion of an aeroplane on the runway before take-off is  linear motion .

(c) The kite looking for its prey flies with circular motion in the sky.

(d) Children sitting in a rotating giant wheel have uniform circular motion, while those sitting in a merry-go-round have a non-uniform circular motion.

Linear motion: An object is said to have linear motion if it moves from one point to another in a straight line. There are two types of linear motion, viz. uniform linear motion and non-uniform linear motion. In uniform linear motion, the distance traversed by an object along a Straight line in unit time is the same. Whereas, in non-uniform motion the distance traversed by an object along a straight line in unit time keeps on changing,

For example: The motion of a moving car on a straight road, the parading soldiers show uniform linear motion, whereas the children playing on a slide show non-uniform linear motion.

Oscillatory motion: The motion of a body that is moving in back and forth direction is called oscillatory motion. Oscillatory motion is a type of non-linear motion. If the oscillatory motion is completed in fixed period of time, it becomes a periodic motion.

For example: The movement of pendulum of a clock, the needle of a sewing machine and vibrating diaphragm of different musical instruments.

Circular motion: An object is said to possess circular motion if it moves from one point to another in such a way that its distance from a fixed point always remains constant. Circular motion can be periodic motion if it is taking place in fixed time period.

In day-to-day life many objects are seen completing circular path. For example: The movement of the blades of a fan, the hands of the clock show circular and periodic motion, The giant wheel, merry-go-round, mixer, etc. show circular motion.

Random motion: The type of motion in which the direction of motion and the speed of an object changes continuously is called random motion. There is no fixed direction for random motion.

For example: Children playing in a garden, the butterflies, birds flying in the sky, the wandering animals, the swimming fish, etc. show random motion.

Periodic motion: The motion in which moving object passes through a certain point again and again after a fixed period is called periodic motion.

For example: The motion of a swing, the hands of the clock complete their rotations in fixed time period. A merry-go-round also completes the rounds in specific time. Therefore this kind of motion is called periodic motion.

Birds flying in the sky have random motion as their direction of motion and speed continuously changes. The birds flying in the sky show oscillatory motion when they flap their wings. Most of the birds show linear motion. Some like kite display circular motion. Crows are seen moving in random motion.

While riding a bicycle on a road, following types of motion can be seen:

• The wheels of the bicycle are in uniform or non-uniform circular.
• The legs of the person riding the bicycle are in uniform or non-uniform circular motion.

• When we start a bicycle we have to pedal it. This is circular motion in which pedals of the bicycle move.
• Then we decide the direction and usually pick up a linear motion. For doing so we can turn the handle of the bicycle.
• If we go with the same speed in one direction it will be uniform linear motion. If we increase and decrease the speed intermittently, it will be non-uniform linear motion.