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
    Answer:

    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

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    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

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    Answer:

    random motion

    Explanation:

    Random motion includes irregular path of motion.

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