Kind of blew through them. My style of content comprehension is generally to watch as a background thing and then rewatch while paying actual attention. As far as actual comprehension and understanding, I'm up to about the fifth lecture of 801 Classical Mechanics.
Anyway more gravity questions. I'm not sure you really answered in the thread why the "curved spacetime" theory of gravity explains why an object at rest will still be accelerated toward the dominant mass by gravity. If "falling" bodies are moving in straight lines through curved spacetime at with their existing momentum, why does something with no momentum fall to the ground?
Somewhat unrelated question. As I understand it, if you're moving through space at constant speed (acceleration = 0) from your reference frame you appear not to be moving and do not feel as if you are moving. This is why we aren't pushed into our seats when on a moving train except when it accelerates from rest. And from a stationary reference point in space, the Sun (and hence its satellites) is moving 370 km/s. But since the earth orbits the Sun at about 30 km/s, that would mean my actual speed is 370 km/s +/- 30 depending on where the earth is in it's revolution. Does this mean that we are in a constant sine-wave like state of acceleration and deceleration that we would be able to feel if our sense of inertia were finely tuned?
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