When a solid body moves such that all the points of the body moves with same velocity, it is called pure translational motion.
A simple example is motion of class table and bench when we pull it.
When a body moves about a fixed line (called axis) such that all of the points of the body on that line (OR axis) are at rest and all other points move in a circle about that fixed axis, it is pure rotational motion. In this type all particles moves in a circular path of different radii, subtending same angle at centre in equal time-interval. For example, rotation of door on it’s hinges, a pulley on it’s axle, or a CD on a CD player turntable. Also or earth, rotating about it’s axis once a day and about sun once a year.
When there is no point on the body which is at rest, i.e. in general every point is moving with different velocity, it is called general motion.
For such motion, we divide the general motion into these two parts and deal them separately as a combination of pure translational motion and pure rotational motion.
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