<prompt> I-passage: Kuyaziwa kusuka kumabhuku akhe ukuthi u-Newton wayebhekene ngasekupheleni kweminyaka yama-1660 nomqondo wokuthi amandla adonsela phansi emhlabeni adlulela, ngokulingana kwesikwele, kuya eNyangeni; kodwa-ke kwamthatha amashumi amabili eminyaka ukuthuthukisa inkolelo-mbono egcwele. Umbuzo wawungekho ukuthi ngabe amandla adonsela phansi akhona yini, kodwa ukuthi ngabe adlulela kude kakhulu noMhlaba ukuthi kungaba futhi amandla abambe iNyanga emzileni wayo. UNewton wabonisa ukuthi uma amandla encipha njengesikwele esiphambene sobude, umuntu angakwazi ngempela ukubala isikhathi sokujikeleza kweNyanga, futhi athole isivumelwano esihle. Waqagela ukuthi amandla afanayo abhekene nokunye ukunyakaza kokujikeleza, ngakho-ke wabiza ngokuthi amandla adonsela phansi emhlabeni wonke. Umbuzo: Iyini umbono kaNewton mayelana namandla adonsela phansi emhlabeni?  <response>: uma amandla encipha njengesikwele esiphambene sebanga, umuntu angakwazi ngempela ukubala isikhathi sokujikeleza kwenyanga 