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Fill in the blanks:
$(i)$. One metre is ______________ cm.
$(ii)$. Five kilometre is ______________ m.
$(iii)$. Motion of a child on a swing is ______________.
$(iv)$. Motion of the needle of a sewing machine is ______________.
$(v)$. Motion of wheel of a bicycle is______________.
$(i)$. One metre is $\underline{100}$ cm.
$\because 1 metre=100\ cm$
$(ii)$. Five kilometre is $\underline{5000}$ m.
$\because 1 kilometre=1000\ metre$
$\therefore 5 kilometre=5\times1000=50000\ m$
$(iii)$. Motion of a child on a swing is $\underline{peiodic}$.
When the child swings, its motion is repeated again and again around a fixed point and hence the motion of the swing is called periodic motion.
$(iv)$. Motion of the needle of a sewing machine is $\underline{periodic}$.
The motion of the needle of a sewing machine is periodic vertically as it moves up and down in a fixed time period. So, the motion of the needle of a sewing machine is periodic motion.
$(v)$. Motion of the wheel of a bicycle is $\underline{circular\ and\ linear}$.
The motion of the wheel of a bicycle is circular as it is rotating around its center and linear too as it moves forward on rotating the wheel.