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Nov 26, 2020 at 22:22 comment added Paul Razvan Berg Question about your 3rd paragraph though .. can you really assume that moving weights around without changing their heights requires not work? If it did require work, would his explanation still be valid? I'm new to physics and this assumption-laden thinking takes me a while to get used to it.
Nov 26, 2020 at 22:13 comment added Paul Razvan Berg Right so he's assuming that there is no external actor acting on the system except for Earth's gravity. That is the logic of "let the weight fall from height Y to to the lower height X".
Nov 24, 2020 at 10:50 history answered gandalf61 CC BY-SA 4.0