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Taxtro
Veritasium
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Comments by "Taxtro" (@MrCmon113) on "How Gravity Actually Works" video.
There is two different notions of acceleration: One is proper acceleration, due to an imbalance of forces. One is the second time derivative of position (and therefore relative).
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@mrfahrenheit677 If gravity is a force, you get the wrong answer in cases like the Twin Paradox and it's mysterious why gravitational mass=inertial mass.
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