I just can’t put my head around the fact that gravity isn’t just a force
EDIT : I now get how it gets stretched and how it’s comparable to putting a ball on a stretchy piece of fabric and everything but why is *gravity* comparable to that. I guess my new question is what is gravity ? 🙂 and how can weight affect it ?
In: Physics
The fun part is being still, moving in a straight line at constant speed AND accelerating along your reference frame ARE ALL THREE THE SAME THING. Now, what does this “reference frame accelerating with you” thing means? If you accelerate in a car, you get pushed back. That’s obviously not the same thing as just sitting still at your living room. That happens because your reference frame (the car) gets accelerated while you don’t.
BUT if you are falling with your car then both you and the car are accelerating at the same time. Both of you are falling at 9.8m/s^2 . So that’s the same as being completely still at space! (That’s how those zero g planes work). Thanks, gravity!
BUT wait again! Orbiting (like the moon orbits the Earth or the Earth orbits the moon) IS falling! Orbiting is literally just falling constantly. So, orbiting must be the same as standing still and the same as moving in a straigth line at constant speed.
But how the hell could we say the moon is moving in a straigth line when we literally see it going in circles around the Earth every single day? That’s where deforming the spacetime comes into play. The moon IS moving in a straight line… is just that the space it’s moving through is curved around the Earth. It’s moving straigth in a curved space. In a curved spaceTIME, since they’re kinda the same thing. Thanks again, gravity!
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