1. Identify the types of motion.
(a) Movement of the earth around the sun: Circular 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
2. Fill in the blanks.
(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-uniform 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 circular motion, while those sitting in a merry-go-round have a circular motion.
(Linear, non-linear, circular, uniform linear, non-uniform linear, uniform circular, non-uniform circular, random)
3. How are we different?
(a) Oscillatory motion and linear motion.
|Oscillatory motion||Linear motion|
|The motion of a body that is swinging back and forth, is called oscillatory motion.||The motion of an object moving in a straight line or in the same direction is called linear Motion.|
|For example: Movement of the pendulum of a clock||For example: Vehicles moving on a straight road|
(b) Linear motion and random motion.
|Linear motion||Random motion|
|The motion of an object moving in a straight line or in the same direction is called linear Motion.||The motion that changes its direction and speed continually is called random motion.|
|For example: Vehicles moving on a straight road||For example: Butterflies flying in a garden.|
(c) Random motion and oscillatory motion.
|Random motion||Oscillatory motion|
|The motion that changes its direction and speed continually is called random motion.||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: Butterflies flying in a garden.||For example: Movement of the pendulum of a clock|
4. Explain in your own words, giving one example each.
(a) Linear motion: The motion of an object moving in a straight line or in the same direction is called linear Motion. For example: Vehicles moving on a straight road.
(b) Oscillatory motion: The motion of a body that is swinging back and forth, is called oscillatory motion. For example the flapping of the wings of the birds.
(c) Circular motion: The motion of an object along a circular path is called circular motion. For example rotating giant wheel.
(d) Random motion: The motion that changes its direction and speed continually is called random motion. For example children playing in the park.
(e) Periodic motion: The motion of an object which passes through a certain point again and again after a fixed period is called periodic motion. For example rising and setting of the sun
5 Answer the following questions in your own words.
(a) Which types of motion are seen in birds flying in the sky?
Ans. Birds flying in the sky show oscillatory motion.
(b) Write in detail about your experience of various types of motion while riding a bicycle on a road.
Ans. While riding a bicycle I experience the following motion:
Uniform linear motion
Non uniform linear motion
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.