MOTION

Page 1

MOTION

Motion is defined as the change of position of an object with respect to time.

Types of motion

1. linear motion

When an object moves along a straight line, it is said to be in linear motion

eg:The Motion of a freely falling body and motion of a lift are examples for linear motion.

vehicles moving along a straight road and a coconut falling from a tree

2.Circular motion

An object moves along a circular path,it is said to be in circular motion

eg:

child in the merry-go-round

Motion of the tip of hands of a clock and a point marked on the blade of the fan are some more examples for circular motion.

3:Rotational Motion If a body revolves about an axis, it is said to be in rotational motion.

Eg. Spinning top

Motion of a fan

Motion of a merry-go-round

4.Periodic motion If an object repeats the same type of motion at regular intervals of time it is said to be in periodic motion.

Eg. Motion of a child in a swing.

Motion of the pendulum in a wall clock.

Motion of the string of veena while plucking

Motion of the moon revolving around the earth

Motion of the earth revolving around the sun

5.Random Motion When an object moves at different speeds and in different directions, it is said to be in random motion.

Eg. A fish swimming in a tank

The movement of a football during a game

6.Multiple Motion

The motion of the wheels of a bicycle is rotational, whereas the motion of the bicycle is linear. The wheels of a bicycle perform rotational as well as linear motion simultaneously. Similarly, a rolling ball and a drilling machine perform more than one type of motion simultaneously.

I. Choose the correct answer.

1.Movement of a branch of a tree in air is an example for ________________ a) Linear Motion b) Circular Motion c) Periodic Motion d) Rotational Motion

2.The motion of a rolling ball is ____________ motion a) Circular b) Linear c) Rotational d) Multiple

3. When a bicycle is in motion, the mouth which is used to fill the air will perform__________ a) Random motion b) Periodic motion c) Circular motion d) All of these

II. Fill in the blanks .

1. The movement of the needle in a sewing machine is _____________ (linear motion, random motion)

2. The rotation of an object about an axis is _____________ (linear, rotational motion)

3. Motion is defined as the change of _____________ of an object with respect to time. (position, mass)