- #1

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are time dilation and length dilation inter dependent?

how can we say thaT THE LENGTH ALONG THE Y-AXIS DOES NOT CONTRACT

and from which side of the length contraction actually happens?

- Thread starter subir
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- #1

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are time dilation and length dilation inter dependent?

how can we say thaT THE LENGTH ALONG THE Y-AXIS DOES NOT CONTRACT

and from which side of the length contraction actually happens?

- #2

russ_watters

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Length contraction is tougher because you measure the length in different frames at the same time. Its tough to convince people that what they are both seeing is "real." However, if it isn't real, the equations don't work.

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As russ said, time dilation is an easy one. Experiments involving high speed rockets and airplanes, carrying one of two highly accurate and near perfectly aligned atomic clocks have been carried out, and the results agree to the predictions of SR to great accuracy. Length contraction is a lot trickier to measure experimentally, but it really isn't neccessary. You see, if lengths didn't contract, or if they contracted along the y-axis as you suggested, then time dilation itself would be impossible, which we know isn't true from the previously mentioned experiments. Length contraction along the direction of motion is a __direct consequence__ of time dilation, so by proving time dilation experimentally, we're also proving length contraction. So, to answer your question, they are interdependent.

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