(1) One Dimensional(D) motion. The motion of a object said to be one dimensional motion if only one out of three coordinates specifying the posotion of the object changes with respect to time.
In such a motion, the object moves along a straight line or well defined path. Therefore, one Dimensional motion is sometime known as rectilinear or linear motion.
Example of 1 D. motion of train along a straight railway track, an object dropped from a certain height above the ground, a man walking on a level and narrow raod.
(2) Two Dimensional motion. The motion of a object said to be two dimensional motion if two out of the three coordinates specifying the postion of object changes w.r.t. time. In such a motion, the object moves in plane.
Example of 2 D. an insect crawling over the floor, earth revolving around the sun.
(3) Three Dimensional motion.The motion of a object said to be three dimensional motion of all the three coordinates specifying the position of the object changes w.r.t. time. In such a motion, the object moves in space.
Example of 3 D. a kite flying on a windy day, random motion of gas molecule, a flying aeroplane or bird.
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