用英语介绍重力的物理知识两分钟的演讲
<p>问题：用英语介绍重力的物理知识两分钟的演讲<p>答案：↓↓↓<p class="nav-title mt10" style="border-top:1px solid #ccc;padding-top: 10px;">马新民的回答：<div class="content-b">网友采纳 Gravitation,orgravity,isanaturalphenomenonbywhichphysicalbodiesattractwithaforceproportionaltotheirmass.Gravitationismostfamiliarastheagentthatgivesweighttoobjectswithmassandcausesthemtofalltothegroundwhendropped.Gravitationcausesdispersedmattertocoalesce,andcoalescedmattertoremainintact,thusaccountingfortheexistenceoftheEarth,theSun,andmostofthemacroscopicobjectsintheuniverse. GravitationisresponsibleforkeepingtheEarthandtheotherplanetsintheirorbitsaroundtheSun;forkeepingtheMooninitsorbitaroundtheEarth;fortheformationoftides;fornaturalconvection,bywhichfluidflowoccursundertheinfluenceofadensitygradientandgravity;forheatingtheinteriorsofformingstarsandplanetstoveryhightemperatures;andforvariousotherphenomenaobservedonEarth. Gravitationisoneofthefourfundamentalinteractionsofnature,alongwithelectromagnetism,andthenuclearstrongforceandweakforce.ModernphysicsdescribesgravitationusingthegeneraltheoryofrelativitybyEinstein,inwhichitisaconsequenceofthecurvatureofspacetimegoverningthemotionofinertialobjects.ThesimplerNewton'slawofuniversalgravitationprovidesanaccurateapproximationformostphysicalsituations.
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