 # Motion

## •    A body is said to be at rest if it does not change its position with respect to its immediate surroundings. •    A body is said to be in motion if it changes its position with respect to its immediate surroundings. •    A body is said to have the translator motion if every point on the moving body moves through the same distance in same interval of time. •    The motion of a body in a straight line is called the rectilinear or linear motion.•    The motion of a body in a curved path is called curvilinear motion. •    When a body moves in a circular path, the motion is said to be circular motion or revolving motion. It is a case of curvilinear motion. •    The to and fro motion of a body from its mean position is said to be oscillatory motion. •    The to and fro motion of a part of body keeping its rest part fixed, is called vibratory motion. •    If motion is repeating after a regular interval of time it is called periodic motion. •    If motion is not repeating after a regular interval of time it is called non periodic motion.

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• Q1

The motion of a toy train engine as shown in the image below is Marks:1

circular

##### Explanation:

Circular motion involves motion along a circle, a circular path or a circular orbit .

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• Q2

Motion of light is called

Marks:1
##### Answer:

rectilinear motion.

##### Explanation:

Motion in a straight line is called rectilinear motion. Light travels in straight line. Hence, its motion is rectilinear.

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• Q3

The motion of a pendulum is an example of

Marks:1
##### Answer:

periodic motion.

##### Explanation:
Motion of a pendulum, i.e., to and fro motion is periodic because it repeats itself again and again at regular intervals of time.
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• Q4

An example of rectilinear motion is

Marks:1
##### Answer:

a striker moving across a carrom board.

##### Explanation:

Rectilinear motion means motion along a straight line. Examples : motion of a vehicle on the straight road, a striker moving across a carrom board, etc. A car moving on a curved path, a ball tied to a string and whirled around are examples of circular motion. The child moving on a swing is an example of periodic motion.

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• Q5

A kite flying in the sky undergoes

Marks:1
##### Answer:

random motion

##### Explanation:

Random motion includes irregular path of motion.

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