Talk:Anti-gravity machine

Another 'machine'
A combined entry - 'Political waffle' and 'Campaign promises' Anna Livia (talk) 16:55, 20 May 2021 (UTC)

perpetual motion
The article currently states: "Many anti-gravity machines would also qualify as perpetual motion machines: if you can genuinely shield something from gravity, this allows you to generate perpetual motion (raise something "for free" using anti-gravity then drop it, doing work as it falls, and repeat)."

I don't think this true. Firstly because, presumably, generating the antigravity field, or shield or force or whatever would presumably requite energy. And secondly because even if you removed the effect of gravity on something it would still have mass - so it would still need energy to move that mass "up".Bob"Life is short and (insert adjective)" 10:04, 18 December 2021 (UTC)