Time dilation

IB Physics: Time dilation

I really like teaching this topic. The explanation is so simple but the consequences so hard to accept. Its well worth using an animated version of the lightclock as the movement makes it easier to see why the ticks of the moving one are slower.I find it easier to use half of the light clock cycle to derive the formula but I suppose strictly speaking you should use there and back since the observer at the bottom mirror...

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