What Is Length Contraction?

The length contract effect, also known as the scale effect, is one of the relativistic effects. The length of a stationary pole can be measured with a standard ruler. For another rod that moves in a straight line at a constant speed along the direction of the rod, if you want to know its length, you must also note the spatial positions of its two ends. The distance between these two spatial positions is defined as the length of the moving pole. The special theory of relativity predicts that the length of a pole moving in the direction of the pole is shorter than when it is stationary ^[1] . This effect indicates the relativity of space.

Length contraction effect

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Consider a long rod placed on the x ' axis of the K' system. Its length is called

With two

The special theory of relativity changes the concept of space, negates absolute space, and points out that space is relative and depends on the frame of reference of the observer. If you look at the ruler in the same frame of reference, its length will not change. But for another observer of the frame of reference, the length of the ruler will shrink in the direction of movement.

In addition, the length-shrink effect of the electric field delay effect from moving charges can also be demonstrated. High-speed moving charges will create an equipotential surface for electric field deformation. Because the propagation speed of the electric field is not infinitely fast, it will inevitably cause a delay. The equipotential surface of the electric field that is emitted to the surrounding area is no longer symmetrical on the spherical surface.