Quote:
Originally Posted by Karls48
[FONT=Times New Roman][SIZE=3]Quote: In SR, the Lorentz transformations apply to time, space, and mass. By contrast, in LR, they apply only to clocks, meter sticks, and momentum. This is a subtle but important distinction. For example, increasing the temperature slows a pendulum clock and increases its length, yet this does not mean that something happens to time or space......
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So LR applies only to clocks and not time? Well the human body can be considered to be a clock as can many other things. Thats the point, frames in relative motion as viewed from each other appear to be living at different rates by their clocks. Of course in there own frame of reference this affect is not visible.
The pendulum is a bad example, as with respect to other objects it is different from say an unheated pendulum next to it. In an intertial frame the clock is accurate in all parts of the frame however when viewed from other inertial frames it is different.
My heart beats at 70 beats a minute so i choose that as my clock. If I measure the heartrate of someone who normally has my heartrate right next to me and it is the same then if they move (somehow) to another inertial frame and now the heartrate is different then to me that is time dilation.
There are no forces involved here to account for the difference (unless you wish to invent one) simply bodies in relative motion.
Paul