it annoys me that I can at least pretend to intuitively understand springs and dampers (friction) but I don't get why inertia exists. Sure, it's a fundamental law, Newton's 2nd, D'Alembert's principle, varies kinetic energy, etc. No idea why the universe decided to work in that manner. If masses warp space, why does it take force to accelerate mass but not to keep it going?
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