We may, for example, just want to talk about events, depicted as points on the graph as in figure a.Ī / Two events are given as points on a graph of position versus time. We don't necessarily need to have a line or a curve drawn on top of the grid to represent a particular object. Now the background comes to the foreground: it's time and space themselves that we're studying. The grid underlying the graph was merely the stage on which the actors played their parts. Before, we used them to describe the motion of objects. These graphs are familiar by now, but we're going to look at them in a slightly different way. We can visualize the structure of space and time using a graph with position and time on its axes. The idea isn't really as radical as it might seem at first. What exactly is this distortion? How do we even conceptualize it? We'll also see that something similar happens to their observations of distances, so both space and time are distorted. Relativity says that when two observers are in different frames of reference, each observer considers the other one's perception of time to be distorted. Definition of the interval in relativity.Cartesian definition of distance in Euclidean geometry.More evidence that fields of force are real: they carry energy.Time delays in forces exerted at a distance.Velocities don't simply add and subtract.
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