. Linear and curvilinear motion :
Linear motion occurs when an object—or, in the case of sport, a human body, a human limb or an object propelled by a human—moves in a straight line.. One example of linear motion is someone running in a straight line. Linear motion is also called rectilinear motion.
When the movement follows a curved path, it is called curvilinear motion. One example of curvilinear motion is the path of tennis ball taken in a lob shot.
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