Uyini amandla adonsela phansi?
Context:Ku-physics, amandla adonsela phansi (ngesiLatini gravitas 'isisindo') kuwukuhlangana okuyisisekelo okubangela ukuncintisana phakathi kwazo zonke izinto ezinobunzima noma amandla. Amandla adonsela phansi, ngokusobala, abuthakathaka kunabo bonke phakathi kwemiphumela yomane eyisisekelo, cishe abuthakathaka ngokuphindwe izikhathi ezingu-10^38 kunomphumela onamandla, izikhathi ezingu-10^36 kunamandla kagesi futhi izikhathi ezingu-10^29 kunomphumela onamandla. Ngenxa yalokho, ayinalo ithonya elibalulekile ezingeni lezinhlayiya ezingaphansi kwe-athomu. Nokho, amandla adonsela phansi ayisici esibaluleke kunazo zonke phakathi kwezinto ezisesilinganisweni esikhulu, futhi anquma ukunyakaza kwamaplanethi, izinkanyezi, imithala ngisho nokukhanya.
Amandla adonsela phansi angachazwa njengokusebenzelana okuyisisekelo okubangela ukuheha okuphakathi kwazo zonke izinto ezinobuningi noma amandla. Nakuba kubhekwa njengamandla abuthakathaka kunawo wonke emandleni amane ayisisekelo (amandla kagesi, amandla ashukumisayo, namandla abuthakathaka), amandla amakhulu kunawo wonke futhi angathonya ukunyakaza kwamaplanethi, izinkanyezi, imithala nokukhanya.