motion of wheel of a bicycle is circular motion. so the wheels of car and sewing machines are also circular motion or roratory motion? give reasons

Dear Student!

You need to understand the difference between circular and rotational motion.

"An object is said to possess circular motion if it moves from one point to another in such a way that its distance from a fixed point always remains constant"

So, motion of the wheel of the bicycle or a car and sewing machine is circular. 

"An object is said to possess rotational motion if it whirls around a fixed axis that passes through it."

Like the Earth spins about a fixed axis, so its motion is rotational.

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