Question

when do you say an object is in rotatory motion?​

Answer 1

Answer:

An object is said to be in rotatory motion if it moves in a circular path about a reference point which is called as the center of the circular motion.

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Answer 2

Purely rotational motion occurs if every particle in the body moves in a circle about a single line. This line is called the axis of rotation. Then the radius vectors from the axis to all particles undergo the same angular displacement at the same time. The axis of rotation need not go through the body.