英语翻译
Ifyoutrytoaccelerateabowlingballbykickingit,youmaybecomepainfullyawareofNewtonthirdlaw.Asyoukicktheball,yourtoeswillfeeltheequalforcetheballisexertingonyou.Ifyouexertaforceonabaseballtostopit,theballalsoexertsaforceonyou.TheseareexamplesoftheforcesdescribedinNewtonthirdlaw:Whenoneobjectexertsaforceonasecondobject,thesecondexertsaforceonthefirstthatisequalinmagnitudebutoppositeindirection.AccordingtoNewtonthirdlaw,ifyouexertasmallforceontheball,itexertsasmallforceonyou.Thelargertheforceyouexertontheball,thestrongeritsforceisonyou.Themagnitudesarealwaysequal.Thesetwoforcesareoftencalledaction-reactionforces.