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In the trampoline demonstration representing space-time and gravity, it is obviously the friction between the trampoline and the ball that determines the path of the ball. Friction is a physical interaction, so space-time has to physically interact with matter for this demonstration to be a plausible description of what is happening actually. My question is, what is or what causes that physical interaction or “friction” between space-time and matter when space-time is curved?? Thank you
Asked Jason Omahne
The trampoline is just an analogy to understand the phenomenon. Gravity is like the depression of the trampoline causing a curvature in the space time continuum.
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IF A TRAIN TRAVELS WITH SPEED OF LIGHT; WHAT HAPPENS TO ITS LENGTH?
Please refer to ther following links for more information on the question.
What is space time?
In order to describe an event, we need to specify its position in space and the time of occurrence. A four-dimensional continuum with the three co ordinates of space and time as the fourth co ordinate is called space-time.
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Can you say What’s This?
Derek shares his idea on origin of Gravity – “if you were to suddenly put a large object in space then the space would be pushed out to the sides (displacement) . because the object is now in the place were space once occupied ?? so space is just pushing back to its original area ???? is this what gravity is??? or bending of space?”
(Here are some related links suggested for exploring further –