Relativistic Addition of Velocity | Special Relativity Ch. 6
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In our universe, when you change from a non-moving perspective to a moving one, or vice versa, that change of perspective is represented by a what's called Lorentz transformation, which is a kind of squeeze-stretch rotation of spacetime that I've mechanically implemented with this spacetime globe. Lorentz transformations keep the speed of light the same for all perspectives, since that's an experimentally verified fact of our universe. For example, let's say I'm not moving – that is, I'm at the same position at all times, and you're moving a third the speed of light to my right, and you turn on a flashlight. Then that light will move at the speed of light, c, or about 300 million m/s, which is drawn as a 45° line on this spacetime diagram. And viewed from ...
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In our universe, when you change from a non-moving perspective to a moving one, or vice versa, that change of perspective is represented by a what's called Lorentz transformation, which is a kind of squeeze-stretch rotation of spacetime that I've mechanically implemented with this spacetime globe. Lorentz transformations keep the speed of light the same for all perspectives, since that's an experimentally verified fact of our universe. For example, let's say I'm not moving – that is, I'm at the same position at all times, and you're moving a third the speed of light to my right, and you turn on a flashlight. Then that light will move at the speed of light, c, or about 300 million m/s, which is drawn as a 45° line on this spacetime diagram. And viewed from ...
