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㹫ʽеMmΪβӵĹϵ

Դ       ʱ䣺2012-9-12 12:11:04
 

ԭ⣺㹫ʽеMmΪʲô˶ӵĹϵ

ţ300ǰͽһġɡѧһҪۡɣһǼ㹫ʽһǶԡĶԡţٵ㹫ʽǣF=GMm/r2ţٰѡΪ ʵͨ߷ϵ໥ã⣬֪ţٵڶ˶ɵļ㹫ʽǣF=maȲţٵʽֻţٶĶţٵڶ˶ɷĻĴСӦF=Mg+mg=(M+m)gF=GMm/r2٣㹫ʽУMm֮ӦӶ˵Ĺϵǣٶʵ֤ţٵF=GMm/r2㹫ʽûдõĽѰdzɹ̫աǣ 㹫ʽеMmΪʲô˶ӵĹϵأ

Ȼţٵ㹫ʽûдڡΪʲôMm֮˶ӹϵȴ޷ţҵĽ͡Ϊʲô˸Ĵ𰸺ܼ򵥣ţٶĶǴġţٵĴеġ롰ٶȡ֮ġϵ㷴ˡţٵۣ˶ԭ򣬡ٶȡ屻Ĺвġԣԭٶǽʵʵ෴ٶȲԭ򣬶һҲ˵ڡûг֮ǰٶȡĴСѱˡ˭أٶȵļ㹫ʽоͿһĿȻg=GM/r2ȻٶgǡM͡ĵľrĹиͲҪIJ롣෴Ϊm塱ڡѾ˵ٶg¾ͻF=mgΪg=GM/r2ԣF=mg=GMm/r2ˣMmֻ֮˵ĹϵӵĹϵô򵥡

ͿֻҪȷǺܼ򵥵ġǣϳ˴󣬾ܼȷģڽʱҲ鷳ʵʽǹʽۡӦ÷ֿԴڽͨ¹ײȷؼĴС֤˭һڽ¹ʵĹбҪȷϵֲСϵ㷴ˣͻһϵ˵⣬ԩһּϵֶΣ۲ǾȷĹؼ

ʽġΪʲôMmӶˡ⵱DZشĿѧ塣ʾDzӦЩνѧʷҵѹϲõʵϿɵĿѧۡȷġ

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