For the situation where an object tied to a string is being whirled in a circle whose plane is horizontal, draw a free body diagram and apply Newton's 2nd law to determine the magnitude of the net force responsible for the motion in terms of the speed of the object, its mass and the radius of the circle.

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Proper Length

The theory of special relativity explains the connection between space and time to objects that move in a straight line at a constant speed. The objects move at the speed of light. When an object approaches light speed, its mass is endless and cannot move faster than light. The most crucial postulate of Einstein's special relativity is that the laws of nature do not change in each frame of reference.