![]() ![]() Just linguistically speaking, we want to describe an object's position that's "good enough" without lacking detail or being superfluous. ![]() ![]() Not that I don't love the physics and maths behind this question. Just my 2c worth, I think there's an easier explanation. So time is the fourth dimension, because that helps us to describe reality. ![]() It doesn't help develop a theory of hunger. Now you can, of course describe your (x,y,z,H) position (where H is hunger) however this doesn't lead to much interesting physics. If the gravity is strong, or the velocity is high, then only the General Relativity description matches observations. If the force of gravity is weak and the velocity of the particle is small then x, y, z correspond to the ordinary position of the particle in 3d space at time t, in the usual Newtonian way. A particle in space becomes a curve in this four dimensional space, and we can use general relativity to find the shape of this line, and so the position of the particle at any given time. It turns out that a good way to describe the paths that objects or light take when in a gravitational field is to describe a curved four-dimensional space with coordinates x,y,z,t. This is because time is the fourth dimension in the theory of General Relativity which describes gravity. ![]()
0 Comments
Leave a Reply. |