# General Science Solutions for Class 6 Science Chapter 9 - Types of Motion

Important points to remember :

1. The continuous displacement of an object is called motion. Objects in motion are those that change their position continuously.
2. The various types of motion are linear, uniform linear, non-uniform linear, oscillatory, circular, periodic and random motion.
3. The distance traversed by an object in unit time is called its speed.
4. The time required to traverse a certain distance depends on the speed of the object. The motion of a body that is oscillating, i.e., swinging back and forth, is called oscillatory motion.
5. The motion of an object along a circular path is called circular motion.
6. The motion of an object which passes through a certain point again and again after a fixed period is called periodic motion.

Question 1 : Identify the types of Motion

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

b) Movement of a ceiling fan : Circular motion.

c) A meteor falling from the sky : Non-uniform 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

Question 2: Fill in the blank.
(Linear, non-linear, circular, uniform linear, non-uniform linear, uniform circular, non-uniform circular, random)

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 non-uniform linear motion .

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

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

Question 3: How are we different?

a) oscillatory motion and linear Motion.
Answer : In oscillatory motion body moves to and fro between two points. For example, motion of simple pendulum.
In linear motion, body moves from one point to another point. For example, car running on the street.

b) Linear motion and random motion.
Answer : In linear motion, body moves from one point to another point. For example, car running on the street.
In random motion, body moves in different directions without any specific pattern. For example, movement of gas molecules in a container.

c) Random motion and oscillatory motion.
Answer : In random motion, body moves in different directions without any specific pattern. For example, movement of gas molecules in a container.
In oscillatory motion body moves to and fro between two points. For example, motion of simple pendulum.

4. Explain in your own words, giving one example each.
a) Linear motion:
Answer : An object is said to have linear motion if it moves from one point to another in a straight line. For example: The motion of a moving car on a straight road.

b) Oscillatory motion:
Answer : The type of motion in which the object moves to and fro repeatedly about a mean or a fixed position is known as oscillatory motion. For example: The movement of pendulum of a clock.

c) Circular motion:
Answer : 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. For example: The movement of the blades of a fan.

d) Random motion:
Answer : The type of motion in which the direction of motion and the speed of an object changes continuously is called random motion. For example: Children playing in a garden.

e) Periodic motion:
Answer : An object is said to possess periodic motion if it moves in such a way that it repeats its motion after a certain interval of time. For example: The motion of a swing.

a) Which types of motion are seen in birds flying in the sky ?
Answer : Birds flying in the sky have random motion as their direction of motion and speed continuously changes.

b) Write in detail about your experience of various types of motion while riding a bicycle on a road.
Answer : 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.The bicycle is in uniform or non-uniform linear motion. It can also be in non-uniform motion.

Question 6 : Complete the puzzle using words for types of motion :
1) a spring is stretched and one end is released
2) a minute hand
3) a see saw
4-5) children in a march past
6) a stone rolling down a hillside.