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Compare Translation motion with rotational motion.

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  • Translation motion- 

If a body is moving such that a line drawn between any two of its internal points remains parallel to itself.

All the particles of the body move along parallel paths.

All the particles of the body follow 1 D motion.

Example- Motion of a body along a straight line.

  • Rotational motion-

A rigid body is said to be in the pure rotation if every particle of the body moves in a circle and the center of all the circles lie on a straight line called the axis of rotation.

The line joining any two internal points does not remain parallel.

Example-motion of wheels, gears, motors.

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