In nonrelativistic physics, velocities add in relative motion. For example, if a boat moves relative to a river, and the river moves relative to the land, then the boat’s velocity relative to the land...In nonrelativistic physics, velocities add in relative motion. For example, if a boat moves relative to a river, and the river moves relative to the land, then the boat’s velocity relative to the land is found by vector addition. This linear behavior cannot hold relativistically.
In Newtonian physics, causal relationships fell into two classes: (1) could potentially cause any event that lay in its future or (2) could have been caused by any event in its past. In a Lorentz spa...In Newtonian physics, causal relationships fell into two classes: (1) could potentially cause any event that lay in its future or (2) could have been caused by any event in its past. In a Lorentz spacetime, there is a third class of events that are too far away from in space, and too close in time, to allow any cause and effect relationship, since causality’s maximum velocity is c . The boundary of this set is formed by the lines with slope ±1 on a (t,x) plot. This is referred to as the light
