00:01
Einstein's special theory of relativity involves thinking about physics as viewed by two observers in two different frames.
00:12
And those frames have relative motion.
00:16
And one of the main postulates or ideas is that there is no way, there's no experiment you can do to tell which of two observance.
00:31
Is actually moving at constant speed.
00:51
That is, the motion is all relative, and you don't know whether one person is moving forwards, one person is moving backwards, or both are in motion towards each other, perhaps.
01:05
There's just no way, no physical experiment you can do to make that determination as long as the two, well, let's just say, in general, the observers are moving with constant velocity.
01:28
So they aren't allowed to turn corners.
01:33
They're allowed to hit bumps.
01:36
They aren't allowed to suspend.
01:38
So they have to be moving relative to each other with a constant smooth velocity.
01:45
And you may have experienced this.
01:47
It's kind of hard to get into a moving vehicle with perfectly smooth motion...