What determines the straightness and curvilinear movement of the body?

The movement of the body, depending on the line that the body describes when moving, is divided into rectilinear and curvilinear.
Rectilinear is a movement in which the body describes a straight line.
The trajectory of movement is a straight line.
Curvilinear is the movement in which the body describes a curved line. The trajectory of movement is a curved line.



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