When the body is in motion it does not change its position with respect to time True or false?

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Science Class VII>Motion & Time>Improve your learning:>Q 1

1. Rest and Motion: 

(i) Rest: When the position of a body with respect to its surroundings does not change with time.

(ii) Motion: When the position of a body with respect to a reference point changes with time, the body is said to be in motion.

2. Types of motion: 

(i) Periodic motion: A repetitive motion, which repeats itself after fixed intervals of time.

(ii) Non-periodic motion: A motion which does not repeat itself after regular intervals of time.

(iii) Oscillatory motion: A motion in which an object describes to and fro or back and forth motion along the same path.

(iv) Rectilinear motion: A motion described by a body along a straight line.

(v) A freely falling stone, a car moving on a straight road, a train moving on a straight rail track are the examples of rectilinear motion.

(vi) Curvilinear motion: Motion of a body in a curved line.

(vii) Circular motion: A motion in which a body moves about a fixed axis without changing the position of this axis.

(viii) Rotational motion: A body is said to be in rotational motion when every particle of that body is in circular motion about a fixed axis.

(ix) A spinning wheel, a charkha, a spinning top, a spinning potter's wheel, a rotating ceiling fan and a spinning wheel of a bicycle, etc., are the examples of rotatory motion.

3. Time: 

(i) Time is defined as a gap between two events. Its SI unit is second.

(ii) Stopwatch: A watch which can be started or stopped when desired. It is used to measure small intervals of time.

(iii) Digital clock: A clock in which time is displayed in digits by electronic circuits.

4. Speed:

(i) The distance travelled per unit time is termed as speed. Its SI unit is m/s.

(ii) A speedometer shows the speed in kilometre per hour.

(iii) 1 kmh=518ms

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