為了測(cè)定一根輕彈簧壓縮最短時(shí)儲(chǔ)存的彈性勢(shì)能大小,可以將彈簧固定在一個(gè)帶光滑凹槽的直軌道的一端,并將軌道固定在水平桌面的邊緣上,如圖所示,用鋼球?qū)椈蓧嚎s至最短,然后突然釋放,鋼球?qū)⒀剀壍里w出桌面,實(shí)驗(yàn)時(shí):                                                                                                                                  

(1)需要直接測(cè)定的物理量是                                                                                      

(2)計(jì)算彈簧最短時(shí)彈性勢(shì)能的關(guān)系式是Ep=                                                 .(用直接測(cè)量的量表示)       

                                                                                                        

                                                                                                                                     


小球質(zhì)量m,小球平拋運(yùn)動(dòng)的水平位移s和高度h.

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