Question

In a discus throw sports event the athlete begins in a circular motion and then releases it why does it move in straight line

Answer 1

The answer is pretty simple. Just consider the example of a rock tied by a thread and rotate it over your head. At the point when you release, it goes in a straight path.
In phyiscs point of view with that in mind, when the thrower motions in a circle and release the discus, the tangential component of the cirvular motion makes the discus go in the straight path.

Answer 2

Circular motion is common to almost all sporting events. Whether it is sports car racing or track and field, baseball running or ice-skating, the motion of objects in circles is a common observation of sports viewers around the world. Like any object moving in a circle, the motion of these objects that we view from the stadium bleachers or watch upon the television monitor are governed by Newton's laws of motion. Their circular motion - however brief or prolonged they may be - is characterized by an inward acceleration and caused by an inward net force. The mathematical analysis of such motions can be conducted in the manner presented earlier in Lesson 2. In this part of Lesson 2 we will investigate a variety of applications of circular motion principles to the world of sports and use Newton's laws to mathematically analyze such motions. The emphasis will not be upon an investigation of the details of every possible sport, but rather upon learning how to apply some general principles so that they can subsequently be applied to every sport.

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