Question

What is the motion of a needle of a sewing machine?

Answer 1

the motion of a needle of a sewing machine is periodic motion......

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Answer 2

The motion of the needle of sewing motion is Periodic Oscillatory motion.
Reason:
Oscillatory motion means the object repeats the to and fro motion from its mean position.

The needle of sewing machine moves up and down repeatedly with a certain time interval.Hence it is considered as Periodic oscillatory motion.