![]() ![]() To make Newton's laws work in a non-inertial frame one must invent "fictitious forces" such as the centrifugal "force" and the Coriolis effect. The planets exist in stable orbits about the sun's gravity well, and the moons about the planets.Ĭlick to expand.Einstein, I believe. That geodesic carries it towards the center of the earth. So the apple, when travelling in the earth's space-time, travels along a geodesic. ![]() Matter and energy is bound to that surface, and quite generally we can argue that an object in freefall must travel along a geodesic. On a geneal curved surface, these things are called geodesics. On a curved surface, the shortest distance between two points is a great circle, and when projected onto a flat surface, the lines aren't straight anymore. So are the air carriers of the world conspiring to make people late? No-they are travelling along the most efficient routes. Please Register or Log in to view the hidden image!īut you should have learned somewhere that the shortest (and quickest) distance between two points is a straight line. If you've ever looked at the routes that airlines travel in the back of the magazine on an airplane, you'll notice that none of the lines are straight: I should explain a few things here, and if you already know this, then I'll just waste the bandwidth. In fact, the scale that the spacetime picture fails is much smaller than even an atom-it is the planck scale.Īpples and planets both move along geodesics in space-time. Click to expand.I don't think the scale of a man is small enough to change the idea of warping space-time. ![]()
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